Bolted Insights

Your essential gateway to bolting knowledge and industrial trends around the world

Bolting Tips

The Experts: What is the difference between a straight pivot pin and the Expander System? Pivot pins are located on cylinder rod ends and between moving mechanical parts. They provide applications with the flexibility they need to operate efficiently.
The Experts: The making or breaking of bolted joints Q: What is Hooke’s Law and why is it crucial to bolted joints? A: Hooke’s Law relates to the accurate tightening of bolted joints. When examining a bolt’s behaviour, the axial force is plotted agai...
Top tips from bolting expert Japan’s foremost expert in bolting and author of 'Bolted joint engineering' - Doctor Tomotsugu Sakai - shares his insights about bolt fastening
The Experts: Improving fatigue resistance To improve fatigue resistance, designers can increase the thread capacity and decrease the alternating stresses at the threads.
The Experts: How to optimize a bolted joint through clamped length Clamped length is the free length of a bolt that is stretched under tension. Find out what is the optimal bolt length that you should consider.
The Experts: How does lubrication affect hydraulic tensioning and multi-jackbolt tensioning? With the traditional method of tightening a nut, using a spanner, lubrication is very important, as there are a lot of surfaces moving against each other.
The Experts: Understanding the markings on nuts and bolts Bolt heads and nuts are often marked with numbers, letters, dashes, slashes, dots, or an assortment of other marks. Let us tell you what they actually mean.
Should I match washers and bolts of different materials? When designing a bolted joint, there are several aspects to consider. Find out what to take note of materials to use for parts of the joint.
Watch: Hydraulic tensioners for compact flanges Boltight’s Xtra Load range of bolt tensioners is used extensively in the offshore oil and gas industry for bolting compact flanges. Watch now
The Experts: How to determine a suitable tightening torque I don’t know the tightening accuracy of my tool. How should I proceed with my torque calculation?
The Experts: Superbolt – your flexible friend How does the added flexibility of Superbolt improve the bolted joint?
Top 10 tips for secure bolting Achieving the safest, most secure bolted connection involves many factors. To help you achieve the best possible results we have summarized into ten bolting tips.
The Experts: The story behind the phenomenon The ‘Virgin Bolt Phenomenon’ is not commonly known but is an important variable to take into account when evaluating stretch measurements properly’

Videos

Watch: Nord-Lock washers in the Junker vibration test
Watch: Irish Rail safely secured with Nord-Lock washers
Watch: Check out our Superbolt product video
Watch: How does the Nord-Lock washer work?
Watch: Presenting the Expansion bolts product video
Watch: Get to know Expander System
Watch: ActSafe trusts the proven quality of Nord-Lock washers

Knowledge

Get Smart Connected machines, components, and systems are creating intelligent networks that can control each other autonomously.
Why do bolts loosen? Bolt loosening can have profound consequences. One loose bolt can bring a whole production plant to a standstill, while in other applications loose bolts can pose a significant safety hazard. So, what are the main causes of bolt loosening?
How bolts are made? Here is the manufacturing process Bolts can come in a wide range of different sizes and shapes, but the production processes may vary depending on how advanced the bolt designs are.
Hydraulic tensioning or torquing - that is the question Which is the best method for controlled tightening of a bolted joint? Bolted plays hydraulic torquing off against hydraulic bolt tensioning. And the winner is…
The history of the bolt Bolts are one of the most common elements used in construction and machine design. Yet, have you ever stopped to wonder where they actually came from?
Standards: the search for a red thread Let's explore the history, the evolution and the future of these crucial but often overlooked thread standards.
Coupling challenges & the evolution What are the challenges with couplings and how they evolved over the years. Bolting experts at Nord-Lock Group share useful insights into the application.
Nord-Lock Group uses Siemens NX CAE to develop cutting edge technologies Bolting solution specialist uses NX CAE to develop cutting-edge technologies. Gained insights of bolted joint and causes of joint failures.
Friction: A force of nature Friction is a factor not to be ignored when it comes to tensioning bolts. Always present in a bolted joint, friction can be part of the problem – or part of the solution.
Aluminium: The endless benefits Aluminium has dominated the aerospace industry for over half a century. Now other industries are turning to the miracle metal.
Combating corrosion Any metal product will eventually rust. How corrosion happens and why choosing the right materials and corrosion protection for the bolt is crucial?
Fastener quality: All in the details Quality fasteners are essential for safe, economic designs. But what determines quality, and how do we make sure we obtain good quality?
Top 10 tips for secure bolting Achieving the safest, most secure bolted connection involves many factors. To help you achieve the best possible results we have summarized into ten bolting tips.

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Alstom and Nord-Lock Group: A secure coupling French multinational Alstom is a global player in the rail transport industry with a raft of international customers seeking the most comprehensive range of products and services on the rail market.
A simple solution for an advanced machine With the world’s appetite for LCD displays seemingly insatiable, Hyundai Robotics’ LCD handling machines are in high demand from LCD manufacturers.
Reducing lug wear once and for all Earthworks contractor, Blackwell, supplies all the mining equipment at House of Water, one of the last remaining surface coal mines in the UK.
Getting the best of both worlds On the face of it, building the Kienlesberg bridge was a real-life mission impossible. After all, how can you successfully bring together two completely opposing concepts?
Saving time and money by using the right wheel nuts Holzwerke Ladenburger is one of Europe’s largest suppliers of wood products for the building industry, producing 800,000m3 of timber products every year. They had to retighten their wheel nuts ever...
When the going gets tough Off-road vehicles are built to handle what would break most cars and trucks. Whether driving through mud or racing up a mountainside, these vehicles need state-of-the-art technology to stay in top condition.
Pushing the boundaries of express trains The central Japan railway Company (JR Central) operates the Shinkansen superexpress bullet trains that connect Tokyo and Osaka – Japan’s two biggest cities.
Steering pins replaced fast THE CHALLENGE A mining company in Canada needed a better solution for replacing the steering pins on its fleet of one hundred Komatsu trucks. With the traditional method, replacing the pins took aro...
Washers reduce costs in propeller assembly Mecklenburger Metallguss GmbH, a world leader in the production of propellers for large container ships chose Nord-Lock as the new standard for all bolted joint applications
Safe and effective wind turbine maintenance Nearly two years ago, US company All Energy Management (AEM) began developing retrofits and training companies that service a fleet of 1,000 wind turbines in the UK, the US, Canada and Italy.
SpaceX competition winners chose wedge-locking washers In 2015, Elon Musk, the billionaire behind the futuristic transport technology companies Tesla and SpaceX, launched the Hyperloop Pod Competition.
Washers triple-protect nuclear transports Daher Nuclear Technologies GmbH, located in Hanau close to Frankfurt am Main, Germany, develops containers for transportation of radioactive substances. For obvious reasons, these containers must b...
Cheaper but better solution for tractors with washers A producer of agricultural vehicles for close to 20 years, Turkish company Hattat Traktör knows that, when the going gets tough, it is the durability and reliability of their products that save the...
Customized washers keep KTM in the race Pick any of the world’s most exciting motor races and you will find the orange motorcycles by KTM, Europe’s largest manufacturer, among the top contenders.
No more loose screws on giant quay cranes CUSTOMER: PACECO ESPAÑA S.A PRODUCTS: QUAY CRANES, YARD CRANES, SERVICES AND SYSTEMS FOR CONTAINER HANDLING ESTABLISHED: 1967 SHAREHOLDERS: MITSUI GROUP AND URSSA, S. COOP. NORD-LOCK PRODUCT: NORD-...
Hydraulic Tensioning Tool For Nuclear Reactor Pressure Vessel Doosan Heavy Industries & Construction required a bolt tensioning solution to tighten nuclear reactor pressure vessel stud bolts.
Improving steel mill safety and productivity The JFE Steel Corporation’s West Japan Works is one of the largest and most advanced steel mills in the world. Switching to Superbolt multi-jack tensioners has turned one of the riskiest maintenance tasks in the plant into one of the safest.
Creating big opportunities for Expander System distributor Viggo Bendz has started supplying Stena Recycling with the Expander System for their grab machines - a potentially lucrative development for a small independent operator.
Bespoke bolt tensioners secure deep-water pipelines Boltight supplies tailormade bolt tensioning equipment for structural split repair clamps to Subsea Innovation in the UK.
Focus on security in windy and vibrating environment Dutch company Akkadia manufactures specialist CCTV systems for demanding situations in various industries. Its cameras can be found everywhere, from offshore, to polar regions and deserts.
Nord-Lock Group keeps the railway industry on track Nord-Lock wedge-locking washers are used in all safety-related areas of the railway industry, such as bogies, coupling devices, brake systems, rail dampers.
Washers keep airplanes in the air Look up into the sky in the coastal city of Miri, in north-eastern Sarawak, Malaysia, and you may see Nord-Lock washers in action: inside a radio-controlled aircraft. These hobby airplanes are sold by Byond Horizon, a business that otherwise uses drones to take aerial photos and videos for companies.
No downtime with innovative Expander System pivot pins Rambooms Oy is a global supplier of breaker boom systems to crusher manufacturers and mines. Based in Finland, its products are used to break oversized rocks.
Converting sea wave motion into energy With oceans covering more than 70 per cent of the earth’s surface, wave power is potentially a huge untapped source of renewable energy.
Renovating Nuremberg’s metro – without affecting the timetable Renovating an underground railway system without weeks of construction and chaos caused by delays and diversions was previously unheard of.
Easy installation of Expander System makes lives easier Stora Enso focuses on providing renewable solutions in packaging, biomaterials, wooden constructions and paper globally.
Quadrupled machine life and thousands of dollars saved The Yanacocha Mine in Northern Peru is one of the largest gold mines in the world. As in any industry, downtime means lost productivity and – as a result – lost money. Keeping the operations running is always of the utmost importance.
Expander System saves a day of work Gamleby Forest is a logging company with a number of harvesters in their fleet.
Pressing problem solved with Superbolt Superbolt tensioners secure Sodick's moulding machines allowing to control the force on the joints and guaranteeing optimal performance of the machines.
New horizons with the Expander System Boskalis has chosen Expander System as their supplier of pivot pins for one of their biggest dredgers – backhoe dredger Baldur.
Tightened just right In a 2006, American Bridge and Fluor got the assignment to build the new eastern span of the San Francisco–Oakland Bay Bridge, the largest public works project in California’s history.
Swivel shackle with impressive lifting power The Swivel Shackle Giga DSS from Codipro incorporates a Superbolt tensioner. This is the most efficient lifting ring ever made and can handle turning loads.
Looking deep into the stars The Large Binocular Telescope (LBT) on Mount Graham in Arizona, USA, is already one of the world’s most advanced optical telescopes. It consists of two 8.4-meter primary mirrors on a common mount s...
Green technology for sustainable land clearing Mulching machines are exposed to extreme vibration. Extending their life cycle and sharpness of the teeth is vital for sustainable land clearing.
New materials increase railway safety The development of new materials, for example glass-fibre reinforced plastic (GRP), has set new trends for the infrastructure of railway companies. Materials on the tracks, such as steel and timber...
The wind turbine time machine With the sector growing globally every year, the wind energy industry is looking to use less material for producing big wind turbine parts.
Expander System passes 50 000h of testing with flying colors The Expander System was field tested in the steering cylinder position on Volvo BM 4300 wheel loaders through four machine lives in Sweden over a period of six years.
Full trust in Expander from the first installation Swedish company Maskinia is a general agent for some of the world’s leading machine manufacturers.
Washers safeguard transport safety To avoid accidents that would put people and the environment in harms way, it is crucial that the transport of liquids is managed safely and efficiently.
Securing bridges over cooling water The Port of Rotterdam (Netherlands) receives every year the visit of around 35,000 seagoing vessels and 130,000 inland vessels. This makes the Port of Rotterdam the largest port in Europe and third...
Taking wind energy to new depths Offshore wind turbines are an increasingly common sight as the world moves towards more sustainable forms of energy production.
Fusion Power Swiss Plasma Center's problems with vertical, horizontal and axial vibrations are solved with the installation of Superbolt expansion bolts.
Staying on track By using Nord-Lock washers, PT. INKA can now be sure that the bolted connections between the bogies and under frame of their trains are fully secured.
Putting the X-series to the test The Challenge Wam Metals is a manufacturer and supplier of a wide range of specialized non-ferrous and ferrous components, servicing both the local South African and the international markets. The...
Superbolt tensioners secure slurry pump cover Two sets of hydraulic wrenches were used previously, with one used to achieve 21,000 lb•ft (28,470 Nm) on the 16 perimeter bolts and another used to achieve the 35,000 lb•ft (47,450 Nm) for the cut water bolt. The larger hydraulic wrench could not be used for all of the nuts because it would not fit.
Forestry machine manufacturer chooses reliable bolt security solution Swedish forestry machine manufacturer SP has led the technological development for almost 30 years in the development and construction of harvester heads. To ensure that all machine components are in place, they turned to Nord-Lock.
Towering challenge for a giant crane Challenges are nothing new to Terex Tower Cranes, an Italian-based manufacturer of cranes for construction and industrial use founded (as Comedil S.r.l) in 1962.
Innovative wind turbine maker gets peace of mind with Nord-Lock Quality and durability are Eastern Wind Power’s top priorities for its 50kW vertical axis wind turbines.
China: Opportunities on the coal market Xi’an Coal Mining Machinery has approved Nord-Lock washers and Superbolt tensioners as specialised components for its shearers and roadheaders.
Ecuador's new power Ecuador already meets 45 percent of its energy needs with hydroelectric power, but is aiming to increase this to 93 percent by 2016.
Superbolt tensioners secure Tata Steel’s BOS converters The Tata Steel’s Port Talbot Basic Oxygen Steelmaking (BOS) plant in South Wales produces some 4.5m tonnes of strip steel a year, making it one of the largest plants in Europe.
Tensioners on Alcoa 50,000-ton press When Alcoa decided to redesign and rebuild their iconic 50,000 ton press located in Cleveland, OH, they contacted Superbolt to design specialty tensioners that could handle the demanding bolting requirements.
A charge from the Alps Backdropped by the Alps, a Swiss power plant has solved the problem of storing electricity.
Advantage iDapt Tennis rackets are subject to huge amounts of stress. Ever-changing hitting angles, ball speed and forces lead to vibration, twisting, deformation and settling issues. Looking to upgrade the iDapt construction, Dunlop turned to Nord-Lock.
Safety secures trust For more than 30 years, unsurpassed safety has been synonymous with the Nord-Lock Group.
Powerful circles Nord-Lock enlarged external diameter wedge locking washers make the connections on a circular storage unit for lignite absolutely secure.
Order in the court The Challenge Invented 50 years ago in Mexico, the racquet sport padel tennis is now played all over Europe. In Sweden, sport floor specialist Unisport is riding the hype, having built around 60 pa...
Giant hammer Driving a pile into the ground involves lifting a 6,000 kg (13,200 pound) weight and accelerating it from a 150 cm (five feet) height, creating a 105 kilojoule force (78,000 foot pound) collision –...
Testing the Energy Solutions of Tomorrow At Clemson University, an old shipyard has been turned into the world’s largest wind energy testing centre. Renk Test System (RTS), a German company, has provided a facility containing the world’s...
Rallying for safe bolted joints Motor sports are not easy on the cars. High speed, torque, vibrations, g-forces and hard knocks put enormous strain on the cars and their components.
Bridging the gap The Hohenzollern Bridge is not only one of Cologne’s most recognizable landmarks, but also a vital link across the Rhine River, connecting the city’s two main train stations. In fact, approximately 1,200 trains cross the bridge daily, making it one of the busiest rail bridges in Germany.
Making deep sea drilling safer As the global industry looks for safer deep sea oil drilling solutions, MPO’s gas riser handling systems are in high demand. In just a few years, they’ve grown from a small office into a global supplier with over 200 employees.
Extreme temperature and high pressure Ethylone and Propylene might not be well known substances to the general public, but they’re actually among the most important products in the global petrochemical industry.
Faster transport for heavy machinery Excavators are a vital piece of machinery for any mine, but for all their horsepower, they are incredibly slow and cumbersome to move. In fact, 15 percent of their time is spent travelling, and this enforced downtime means lost income.
Reaching for the sun OHB Sweden AB provides the Solar Orbiter with systems that allow it to position itself in orbit around the sun and make a complex series of gravitational-assist fly-bys past both Earth and Venus. Since bolt loosening can’t be fixed in space, OHB takes no chances.
Blown away Global Tech 1 is one of the first offshore wind farms being built in the German section of the North Sea. When completed, it will be able to generate more than 1.4 billion kilowatt hours per year o...
The blade sticks to the handle Fencing is a demanding sport, not only for the athletes but also on the equipment. In any competition a fencing sword is subjected to lots of movement and pressure, which can gradually loosen the connection between the blade and the handle.
The Challenge: Andritz Hydro AB helping hydropower look to the future The hydropower plant in Laxede on the river Luleälven was built more than 50 years ago. The turbines in two of the three units are now being refurbished and, for the first time, the runners will be replaced – a challenge taken on by Andritz Hydro AB.
No time for downtime Every year Nucor produces over 21 million tonnes of steel, making it the biggest steel producer in North America and one of the biggest in the world.
Right on target For over thirty years, Biathlon Target System Kurvinen has been a world-class pioneer in biathlon target and range systems and has exported its products to over 30 countries. During a competition, Kurvinen targets will be continuously shot at and subjected to thousands of hits.
Turning water into power For over 35 years, Canyon Hydro has been delivering hydro-electric systems to customers all over the world, and has built up a reputation for efficient designs, quality components and comprehensive...
The height of safety When you are building the world’s tallest freestanding broadcasting tower in one of the world’s most earthquake-prone countries, using anything but the highest quality materials and the safest construction solutions is just unthinkable.
What a lift! When enormous 35-tonne containers are being maneuvered into place at the world’s major ports equipment reliability is paramount. The giant cranes must work under tight constraints and with exacting precision.That’s why Nord-Lock and crane spreader manufacturer Bromma are the perfect match.
Tough machines for a tough industry In the mining industry, every minute of downtime results in lost income, and one loose fastener can cost a small fortune. This is why Joy Global doesn’t compromise when it comes to bolt security.
In perfect rotation Since 1947, trucks from all large manufacturers such as Volvo, Scania and MAN find their way to Swedish truck body builder Laxo Mekan AB for customised chassis construction work.
D2FC saves time and money through Nord-Lock D2FC, a French company that manufactures critical high pressure control valves for hydro-electric power plants, has decided to generalise the use of Nord-Lock washers.
Propelled upwards Sensenich has been manufacturing aircraft propellers since 1932, and as the industry has grown and developed, it has continued to develop new propellers to match.
The world’s biggest crane Growing demand in the world’s construction industry has seen the rise of a new breed of super cranes. However, one of the biggest and best in the world is the Bigge 125D AFRD (A-Frame Ring Derrick)...
Opening up new fields It seemed like an impossible task. Build an offshore gas platform that was strong enough to withstand the North Sea, yet flexible enough that it could be dismantled and relocated
Maintaining a tight grip Bolt loosening can occur due to settlement or relaxation of a bolted joint. Nord-Lock X-series washers prove to be solution for Mosdorfer's space dampers.
Competing in the world’s most dangerous race In January 2013, the legendary Dakar Rally started in Peru for the first time and end in Chile, having crossed the Andes into Argentina.
Forging ahead How do you hold together a press which exerts 8,000 tons of pressure to shape red-hot pieces of metal which themselves weigh tens of tons? For A. Finkl & Sons, a leading supplier of forging die steels and custom open-die forgings, there was only one answer: Superbolt.
Eliminating bolt loosening for good At power plants across the world, gas turbines are becoming increasingly vital to the world’s power supplies. Mitsubishi Heavy Industries currently manufacture ultra-large gas turbines, which are more than six metres tall and over 16 metres long.
Taking the shock out of EVS EVTV Motor Verks in Cape Girardeau, Missouri, which sells motors, batteries and other components to enthusiasts around the world, has found a simple solution to this issue. By using Nord-Lock SP washers on the braided straps that link one cell to the next, these connections are secured.
Dig this solution Customer: SKF Mekan Shaft diameter range: 430 to 900 mm No. of Superbolts fitted: 4 Product: SED bearing housing Bearing dimension series: 30, 31, 32 and 39 Lubrication: Grease, oil You wouldn’t wa...
Taking on the ice Invented in Sweden in the 1930s, ice racing is a motor sport unlike any other. The bikes have front and rear suspension in order to cope with the extreme vibrations caused by up to ten centimetres deep ice furrows that occur on the track after only a few heats.
Safe transport Whether you like to ski in France, or further afield in Northern China, Korea, the United States or even Dubai, chances are you won’t walk to the top of the slope. You will sit on a ski lift or take a cable car. And chances are high that the cable system you are relying on to get you quickly and safely to your destination has been designed and manufactured by French company Poma.
A tall order Soaring into the Manhattan skyline at the site of the world’s worst terrorist atrocity, One World Trade Center (also known as the Freedom Tower) will be the United States’ tallest skyscraper. This symbol of pride and hope is currently under construction where the Twin Towers once stood, and is an integral part of the renewal of this site, which will be comprised of five new skyscrapers.
Ravishing and reliable Since 1978, Donkervoort Automobielen has been hand-building bespoke sports cars for true motoring enthusiasts. The Dutch family-run company’s stunning vehicles are sought after for their light weight, performance and exclusivity – only about 40 to 50 are made each year – and their track pedigree is well proven: last year a Donkervoort D8 GT won its class at the prestigious 24 hours of Dubai endurance race.
End of the line for frozen rails Snow can trigger travel chaos for the hundreds of thousands of commuters who pour into London each day. One particular winter problem on southeast England’s rail network is the vulnerability of the conductor rail (which runs parallel to the running rails and supplies the trains with electrical power) to cold weather, and in particular snow and ice.
Keeping up the pressure Customer: Ekström & Son Weight: 80 tons Temperature: 300 Degrees Celsius Usage: Hydrogen plant Total Pressure: 35 bar Bolt size: M64x6 The Swedish company Ekström & Son is one of Europe’s leading m...
Cern hadron collider Superbolt was chosen to supply over 1,500 high-strength mechanical tensioners, expansion bolts and bolt-style multi-jackbolt tensioners (MJTs) as part of the U.S. contribution for the CERN Hadron S...
Adjustable bolted propeller Large ships are increasingly being equipped with higher propulsive power. This trend is generating a need for larger propellers. Such propellers are typically of monobloc design, i.e. constructed from one casting. They are difficult to machine and their high weight and bulk make handling and transportation a costly enterprise.
Nord-Lock goes rock’n’roll Customer: Anacon Technology Latest Amplifier Model: Tubewonder Maximum Sound Pressure Level: 118 dB Weight: 19 kg Input power: max 160 VA Output Power: 55 W Price range: from approx. USD 4,500 The...
Bolting into space Mankind’s next giant leap in space exploration will take us to destinations throughout our solar system never before explored by humans.The spacecraft that will take us there, the Orion Multi-Purpo...
Safe travelling The City Tunnel is a rail link between Malmö and the Öresund Bridge in Sweden, with a six kilometre railway running under Malmö city centre. The glasswork company Skandinaviska Glassystem, was assigned the task of constructing the roof of the new Triangeln railway station situated in central Malmö.
Powering the industry Electric motors are often called the “workhorses of the industry”, running all kinds of machinery ranging from escalators and ski lifts to huge port cranes. Heavy mechanical movements require a reliable drive that ensures the best torque, speed, and motor efficiency. This reliability often starts with the right bolt securing system.
GE Wind turbine using Expansion bolt for blind hole The Nord-Lock Expansion bolt for blind hole applications is used on the flange coupling of the gear box on this wind turbine. The solution integrates Superbolt technology and is used to transmit the enormous torque.
VEM Sashenwerke, Germany using Expansion bolt for blind hole The frame of the steel mill at VEM Sashenwerke, Germany is using the Nord-Lock Expansion bolt for blind hole applications, which integrates Superbolt technology as replacement for a dowel pin
Ship propeller shaft on tanker The Challenge WPNL delivers the complete ship propulsion to NASSCO. For the connection of the flange, the ship wharf specifies Superbolt Expansion Bolts. The Solution Since the ship shafts are made...
Crusher drum bits The Challenge When mining coal underground, the severe environment takes a brutal toll on the crusher drum bits. In operation, it is an extremely violent application with high rpm’s and constant po...
Press columns on forging press Due to the nature of big presses, large diameter columns must be used to distribute the extremely high working loads generated. However, the torque required to prestress these columns is almost impossible to achieve with conventional bolting methods.
Bulleyes! Right on target The Challenge In the world of archery, accuracy is everything. The latest high-tech compound bows use a system of pulleys to produce ferocious amounts of power, but that power is useless if the arr...
Drill with Skill When it comes to drills, size and horsepower are not everything. In small confined spaces or sensitive environments, it is more important to have equipment that is flexible and can drill with finesse.
Opening new doors Since its completion last year, the Burj Khalifa skyscraper in Dubai has already broken numerous world records. Apart from being the tallest structure ever built, it also includes the world’s highe...
Good vibrations The huge machines made by Metso Minerals France are a mechanical nightmare. Whereas vibrations are usually eliminated from machines, the very raison d’être of the Metso machines is to vibrate as mu...
The low-cost wind energy alternative French manufacturer Nenuphar is currently on track to make a huge breakthrough in floating wind turbine technology with its VertiWind project. Unlike traditional wind turbines, the VertiWind turbine has a vertical axis, which allows for a lower centre of gravity and a significantly smaller flotation system.
The power of the sun: transformed by Siemens turbines Assembling an industrial-sized turbine requires acres of room. It also requires thousands of bolts and washers to be assembled and tightened to guarantee a service life of the product, which in the solar energy, biomass, oil and gas sectors, is typically upwards of 30 years.
The Mercedes connection Hybrid vehicles use combustion engines and electric motors in parallel. High-voltage supply systems in these new vehicles place considerable demands on the connectors which provide the interface between the battery and the electronics.
Plunging to New Depths In its quest to be the world’s leading service provider for the exploration and extraction of natural resources, Fugro has had to overcome all the world’s natural barriers. With its world class ROVs (remotely operated vehicles) even the deepest oceans are within its reach.
A Cut Above the Rest Trying to cut through steel requires powerful blades, yet the Rapid Cut 16 can slice through a 16mm thick steel bar like a pair of scissors cuts through paper. Proyecsa SCCL has been manufacturing...
Pulling Their Weight Through the daily grind of its gruelling work schedule, many areas of a tractor, such as the front axle, come under incredible strain and bolt loosening can be a constant problem. ITL use Nord-Lock washers in all such critical areas, including the front axle, engine clutch and gearbox.
Vertical agitator The bearing play specified by the bearing manufacturer FAG for this tapered roller bearing could not be adjusted correctly. The existing bearing lock nut design and the tight space have prevented this.
Built for Speed The world’s fastest conventional trains run in France, and not just to break the April 2007 record of 574.8 km/h (under test conditions with a shortened train). The TGV regularly runs at 320 km/h and at those kinds of speeds it is absolutely vital that nothing falls off the rolling-stock to derail the train. This is where Nord-Lock comes into the picture.
Tough trial puts wheel nuts to the test “We’ve been in some pretty tough situations but we haven’t had any wheels come loose since we fitted Nord-Lock wheel nuts.” - proven at the European truck trial
Conquering the Seas Mitsui recently began using Nord-Lock components in their marine diesel engines. Because Nord-Lock components are comparatively light and small, they are effective in making assembly and tightening quicker and safer especially in poorly-accessible or confined places.
On top of the Globe The futuristic Ericsson Globe has come to dominate the Stockholm skyline with its distinctive golf-ball structure being visible for miles around. Now it offers panoramic views of Stockholm from the...
Going with the Flow A heaving metropolis like New York needs a lot of water. It may be the city that never sleeps but it certainly drinks, bathes and cleans. Assisting in the mammoth task of supplying water for over e...
On time on the mainline Speed, comfort and luxury are all very well, but any stressed commuter can tell you that the most important attribute for a train is reliability.
Engineering with a bite While striving for the highest standards of engineering, Viper decided to implement Nord-Lock washers in eight locations, including turn-signal stalks and brake rotors.
Sea change Rotech Subsea turned to Nord-Lock, testing 200 pairs of washers on 1m-diameter bolted flange joints on an excavator bound for offshore work near Sakhalin, Russia.
How Corus stopped money melting away Corus is Europe’s second largest steel producer. In normal trading conditions it generates annual revenues of more than 13 billion euro and produces about 20 million tonnes of steel a year. Part of the Tata Steel Group, it supplies many of the most demanding metal customers across the UK and EU.
A giant that treads softly A combine harvester fitted with the Soucy Track system reduces the pressure per centimetre exerted on the ground by a factor of four compared with a vehicle with conventional tyres. The chemical adhesives it used for bolt securing in the past often failed, so today Soucy chooses Nord-Lock washers.
Sail of the century Royal Huisman’s demands on quality and attention to detail extend throughout the 30–90 meters (98–295 ft) long vessels, from the sumptuous interiors to the very latest navigation technologies. When the shipyard was looking for a bolt-securing solution that could handle the dynamic loads unleashed by the harsh marine environ­ment, it turned to Nord-Lock.
You’re gonna dig this A kilometer below the churning waves, more than a thousand pairs of Nord-Lock washers are used throughout the plough application where clamp load must be maintained in the bolted joints.
Underground operations Sandvik Mining and Construction was having problems with the bolts clamping the cutting tools to the reaming head; they were sometimes coming loose under the extreme vibrations, loads and torque involved. Replacing the bolts which vibrated loose was a costly, time consuming and often dangerous job.
Built for speed The latest version of Japan Railway’s famous Shinkansen, known around the world as the Bullet Train, reaches speeds of 300 kilometres per hour.
A formula for success A key piece of equipment in any pit stop is the pneumatic impact wrench, or wheel gun, which is relied on to loosen the large nut holding on each wheel and then screw on a new wheel – all in the blink of an eye.
Tunnel vision Twenty meters beneath the streets of Malmö, Sweden, the new underground section of the city’s central station is gradually taking shape.
Piste perfect Whatever slope a skier can ski down, this vehicle can drive up. Regardless of the angle, the pitch, the bumps and the dips, the extreme cold and driving snow, nothing stands in its way.
An absolute scream The idea behind a roller coaster is simple: use the laws of physics to thrill passengers by simulating danger with high speeds, big drops and inversions. But despite the hair-raising impression of...
Cranes The connection between the slewing ring and the portal requires very high precision during the tightening of the bolted connection. Kirow Ardelt meets these high demands by using Superbolt® tensioners.
The Experts: What is the difference between a straight pivot pin and the Expander System? Pivot pins are located on cylinder rod ends and between moving mechanical parts. They provide applications with the flexibility they need to operate efficiently.
The Experts: What is the relationship between torque, preload and friction? One of the main methods to preload a bolt is to apply a torque on its head. This is a very common process in the industry, however it is not easy to control accurately.
The Experts: The making or breaking of bolted joints Q: What is Hooke’s Law and why is it crucial to bolted joints? A: Hooke’s Law relates to the accurate tightening of bolted joints. When examining a bolt’s behaviour, the axial force is plotted agai...
Top tips from bolting expert Japan’s foremost expert in bolting and author of 'Bolted joint engineering' - Doctor Tomotsugu Sakai - shares his insights about bolt fastening
The Experts: Improving fatigue resistance To improve fatigue resistance, designers can increase the thread capacity and decrease the alternating stresses at the threads.
The Experts: How to optimize a bolted joint through clamped length Clamped length is the free length of a bolt that is stretched under tension. Find out what is the optimal bolt length that you should consider.
The Experts: How does lubrication affect hydraulic tensioning and multi-jackbolt tensioning? With the traditional method of tightening a nut, using a spanner, lubrication is very important, as there are a lot of surfaces moving against each other.
The Experts: Understanding the markings on nuts and bolts Bolt heads and nuts are often marked with numbers, letters, dashes, slashes, dots, or an assortment of other marks. Let us tell you what they actually mean.
Should I match washers and bolts of different materials? When designing a bolted joint, there are several aspects to consider. Find out what to take note of materials to use for parts of the joint.
The Experts: Preventing galling and seizing in bolting Galling is caused by a combination of friction and adhesion between metallic surfaces during sliding. In extreme cases galling leads to seizing.
The Experts: The benefit of SC-washers What is a SC-washer and when should I use it?
The Experts: What effect will Nord-Lock washers have on my surfaces? Will Nord-Lock wedge-locking system damage the surface in my application?
The Experts: Why does torque vary when tightening and untightening? Why is the untightening torque lower than the tightening torque when tightening a bolt or nut?
The Experts: Why do Superbolt multi-jackbolt tensioners prevent loss of preload? Superbolts have been used in numerous demanding bolting applications with extreme working loads and high vibrations. What mechanical principle of Superbolts prevent loss of preload?
The Experts: Hydraulic bolt tensioning tools  What are the key advantages of hydraulic tensioners?
The Experts: Can I use an additional locking system? Other specialised locking systems, including prevailing nuts and adhesives, are not advisable and would not add any benefits to the joints.
The Experts: Should I change my tightening torque with Nord-Lock? Does the use of Nord-Lock washers affect my tightening routines? How?
The Experts: The notch effect What is the notch effect and how does it affect bolts?
The Experts: How to determine a suitable tightening torque I don’t know the tightening accuracy of my tool. How should I proceed with my torque calculation?
The Experts: Getting the most out of fasteners Before you re-use bolts, you should always consider the security level of the assembly and economic factors.
The Experts: Picking up the slack Why is slackening becoming an increasing problem?
The Experts: The benefits of bolt shanks What is a bolt shank and what are the benefits and advantages of this solution?
The Experts: Superbolt – your flexible friend How does the added flexibility of Superbolt improve the bolted joint?
The Experts: Tightening Superbolt Why should I tighten a Superbolt initially in a crosswise pattern?
The Experts: Thread engagement in a tapped hole What is the recommended thread engagement to make a strong connection for a component with a tapped hole?
The Experts: The importance of temperature in bolting What is the most common temperature range for bolts, and what are the consequences of exceeding it?
The Experts: Service life of studs and bolts exposed to dynamic loads How do you extend the life of studs?
The Experts: Effects of lubrication when reusing fasteners By lubricating the fastener before every use, not only can friction be reduced to improve torque-to-load ratio, friction scatter can also be reduced to improve preload accuracy.
Top 10 tips for secure bolting Achieving the safest, most secure bolted connection involves many factors. To help you achieve the best possible results we have summarized into ten bolting tips.
The Experts: The story behind the phenomenon The ‘Virgin Bolt Phenomenon’ is not commonly known but is an important variable to take into account when evaluating stretch measurements properly’
The Experts: Sharing the load Why does Nord-Lock supply a hardened washer with every Superbolt tensioner?
Continued Innovation: Tamper-resistant tensioner ready for the market The tamper-resistant tensioner is much like an armoured version of the multi-jackbolt tensioner, except it requires a specially designed socket for tightening and removal.
The Experts: The formula for calculating jackbolt torque How do I calculate the jackbolt torque (based on a formula)?
The Experts: SEMS overview  What are SEMS?
The Experts: Material fatigue explained What is the fatigue phenomena in bolted connections?
The Experts: How do I take torsion into consideration when tightening?  How do I take torsion into consideration when tightening a bolted joint?
The Experts: Which washer material should I choose? I have read that Nord-Lock washers come in five different materials. How do I know which one to use in my application?
The Experts: How much thread engagement is needed in a tapped hole?  Is it possible to determine the minimum thread engagement in a tapped hole to avoid thread stripping?
The Experts: Can Nord-Lock be used on inclined contact surfaces? What is the maximal angle of surface inclination where the Nord-Lock wedge-locking system can still work successfully?
The Experts: Do Nord-Lock washers work with oversized holes? How can I apply Nord-Lock to slotted/oversized holes?
The Experts: Do Nord-Lock washers work with fiber composites? Can Nord-Lock washers be used on fiber composite materials?
The Experts: Can I yield my bolt by over-tightening? Do I risk yielding my bolt, due to over-tightening, when using Nord-Lock wedge-locking solutions?
The Experts: Can I use other washers with Nord-Lock? Can I put another washer under a Nord-Lock washer?
The Experts: Should I choose fine or coarse thread? What is the difference between fine and coarse threaded bolts?
The Experts: Why use wedge-locking instead of friction based? What is the difference between friction-based locking and wedge locking and when is lubrication needed?
The Experts: Why do bolts rotate loose? Why do bolts and nuts rotate loose when a bolted joint is subjected to vibration and/or dynamic loads?
The holy grail of jackbolt tensioning Since the launch of the Superbolt Multi-Jackbolt Tensioner (MJT) in 1984, efforts have been made to constantly improve efficiency.
Get Smart Connected machines, components, and systems are creating intelligent networks that can control each other autonomously.
Opportunities in the CIS mining industry Higher commodity prices, lower inflation and an ongoing recovery in the still-shaky Russian economy are fuelling a similar recovery in other CIS countries, in the process opening new opportunities...
Reliability Is The Key To Running A Successful Railway Railways are made up of complex mechanical and electrical systems with thousands of moving parts. Rolling stock is the most maintenance intensive part of the railway system and is the most vulnerab...
Why do bolts loosen? Bolt loosening can have profound consequences. One loose bolt can bring a whole production plant to a standstill, while in other applications loose bolts can pose a significant safety hazard. So, what are the main causes of bolt loosening?
How bolts are made? Here is the manufacturing process Bolts can come in a wide range of different sizes and shapes, but the production processes may vary depending on how advanced the bolt designs are.
The history of the bolt Bolts are one of the most common elements used in construction and machine design. Yet, have you ever stopped to wonder where they actually came from?
A viable solution that can end lug wear In many industries, lug wear is simply accepted as an unavoidable fact of life. But does it need to be? Could the Expander System offer a viable solution?
Safely securing connections in structural steel Steel is one of the most commonly used materials in commercial and industrial building construction as it provides high design flexibility.
Hydraulic tensioning or torquing - that is the question Which is the best method for controlled tightening of a bolted joint? Bolted plays hydraulic torquing off against hydraulic bolt tensioning. And the winner is…
Standards: the search for a red thread Let's explore the history, the evolution and the future of these crucial but often overlooked thread standards.
Coupling challenges & the evolution What are the challenges with couplings and how they evolved over the years. Bolting experts at Nord-Lock Group share useful insights into the application.
Mythbusters: A small thread pitch reduces fatigue life due to the notch effect A general statement is, as so often, not possible in this case since various parameters interact. There could be more factors that influence the thread pitch.
Health & Safety: Shared expertise increases safety DROPS (Dropped Objects Prevention Scheme) was started to counteract objects dropped from height damage equipment, disrupt operations and causing injuries.
Nord-Lock Group uses Siemens NX CAE to develop cutting edge technologies Bolting solution specialist uses NX CAE to develop cutting-edge technologies. Gained insights of bolted joint and causes of joint failures.
New innovations to solve difficult shaft coupling bolting problems Examine possibility to overcome bolting challenges to achieve a bolted connection that is pre-loaded safely.
Bolting with plastic and composites The multifunctional wedge-locking technology has a number of advantages compared to conventional solutions when bolting plastic and composites.
The Comparison: Bolts versus rivets By using Nord-Lock washers, a bolted fastener can overcome many of the disadvantages of rivets, while still offering the advantages of bolts.
Mythbusters: Chemical thread locking (adhesives) works as a lubricant during tightening Chemical thread locking is a traditional solution used against bolt loosening, but does it has the same effect as a real lubricant?
Bolting Failure Analysis Nuts and bolts are used everywhere. A bolting failure at home is usually only a minor nuisance. However, a similar failure at a nuclear power plant could be catastrophic.
Friction: A force of nature Friction is a factor not to be ignored when it comes to tensioning bolts. Always present in a bolted joint, friction can be part of the problem – or part of the solution.
Stronger, safer bolting with FEA software Nord-Lock Group's Finite Element Analysis (FEA) offers a fast and convenient method for calculating the risk of bolt failure.
Aluminium: The endless benefits Aluminium has dominated the aerospace industry for over half a century. Now other industries are turning to the miracle metal.
Expandable bolts save time and money Superbolt EzFit expansion coupling bolts offer a simple and quick bolting solution for large machinery couplings that will save time and costs.
Comparison of common bolt tightening methods Tightening methods can be categorized according to the principle of how the preload is generated. The 2 basic principles are rotational tightening and tensioning.
Mythbusters: A common misconception is that stainless steel is never affected by corrosion Stainless steel is never affected by corrosion - is this the truth or a misconception?
Combating corrosion Any metal product will eventually rust. How corrosion happens and why choosing the right materials and corrosion protection for the bolt is crucial?
Mythbusters: It takes longer to install a Superbolt (MJT) than the solution you already have Tightening large diameter bolts with Superbolt tensioners, does it take more or less time?
Comparing Nord-Lock X-series with serrated spring washers How does Nord-Lock X-series washer compares to a serrated spring washers? Let's look at the dynamic loads, reusability, settlement and creep.
No bolt loosening in steel structures Nord-Lock introduces a new range of washers specially designed to fit the HV bolting systems used for steel construction.
True or false? Many people believe that after tightening part of the torque still remains in the bolt - is that true or false? We got the answer!
STCs offer a unique alternative for large press columns This patented design is a new style of Superbolt tensioner that makes it even easier to secure large threads and press columns.
Comparing Superbolt nut-style multi-jackbolt tensioners with hex nuts How does Superbolt tensioners compare to hex nuts? Let's look at the design aspect, safety, installation times and galling issues.
Think Big Superbolt tensioners - from an eureka moment in a US steel mill to a widely used tensioning solution, securing satellites to submarines to the Large Hadron Collider at CERN.
Superbolt: A simple idea with global potential A culture of innovation led to new product lines based on the Superbolt multi-jackbolt tensioner design.
Fastener quality: All in the details Quality fasteners are essential for safe, economic designs. But what determines quality, and how do we make sure we obtain good quality?
Mythbusters: If the clamp length is at least five times the bolt’s diameter, then the joint will not loosen from vibration Is that true or false?
Mythbusters: The higher the bolt grade, the lower the stretching ability of the bolt The higher the bolt grade, the lower the stretching ability of the bolt. Is this true?
Comparing solutions for bolt securing: Nord-Lock with Extension socket Extension sockets or Nord-Lock washers? Let us take you through the key parameters so that you can make the right choice.
Get value for life: Proper bolt securing may reduce costs 1,000 times While there may be cheaper alternatives, choosing the right bolting solution will pay you back many times over in the long term.
Comparing solutions for bolt securing: Nord-Lock with Tab washers Tab washers or Nord-Lock washers? Finding the ultimate bolt securing system is no easy task. Here is a guide to making the right choice.
Talking the torque Experienced assembly technology engineer Bernard Tollet discusses optimising torque and clamp load, and the various ingredients concerning tightening technologies.
Offshore special tensioner This tensioner was developed for the unique needs of the offshore industry.
Comparing solutions for bolt securing: Nord-Lock with Nylon insert nuts How do Nord-Lock washers compare with nylon insert nuts? This guide lists key parameters to help you make the right choice.
It’s all about the coating The coating is a fastener’s skin – a protective shell that preserves the steel that it encases. But what types of coatings are there and what are their purposes?
Introducing the Junker Test According to DIN 65151, the Junker vibration is considered to be the most rigorous method for testing bolted joints.
Comparing solutions for bolt securing: Nord-Lock with Safety/Locking wire Safety wire/locking wire or Nord-Lock washers? Let us take you through the key parameters so that you can make the right choice.
How to pick the right size In engineering, manufacturing and construction, the bolted joint is an assembly that sometimes is very much taken for granted.
Comparing solutions for bolt securing: Nord-Lock with Adhesive Adhesives or Nord-Lock washers? Finding the ultimate bolt securing system is no easy task. Here is a guide to making the right choice.
“Instrumented bolts would be really interesting for the industry” “Instrumented bolts would be very interesting for the industry”
“There’s no stock, no waste, and it can be done locally” Since its launch in 2013, Dutch 3D printing start-up 3D Hubs has produced over a million parts, making it the world leader in distributed manufacturing.
Hydropower: Relying on Superbolt for 30 years When it comes to long-term Superbolt users, American Mike Bruno is hard to beat. More than 30 years ago, he was involved in one of the earliest installations of Superbolt tensioners in a hydropower...
Offering a greater field of solutions For Fred Heaton, what started out as a hobby in 1999 quickly grew into a thriving business specialising in hydraulic bolt tensioners. Now Boltight has been acquired by the Nord-Lock Group, in a mov...
Fastener peace of mind Understand the risk of hydrogen embrittlement and ensure good sourcing of fasteners by questioning quality-related issues and manufacturer's capabilities.
A unique technology is emerging Nord-Lock Group interviews Laurence Claus, an expert in fastener and automotive supplier industries, with more than 25 years of experience.
An insider’s outlook If you want to know what is going on in the world of fasteners, ask Salim Brahimi, the authority on fastener hydrogen embrittlement and an active member of several standards committees, for example...
In the fast lane to greener motoring If the job you want to do doesn’t exist, then invent it. That’s what Gordon Foat did to combine his two passions: motor cars and safeguarding the environment.
Chalmers takes the chequered flag Young engineers from Gothenburg’s Chalmers University of Technology – proudly partnered by Nord-Lock – have won the world’s largest student engineering competition. After ten months of designing, b...
Building communities through bolts Students from the German city of Karlsruhe founded “Engineers Without Borders – Karlsruhe Institute of Technology e. V.” in 2004 to supply first aid to Sri Lanka in the wake of the tsunami. The clu...
They didn’t think we could succeed An interview with Kurt Persson, Senior Advisor of Nord-Lock. With 50 years of experience, see how he describes the evolution of a humble family business to an international industrial company.
Safety and quality are key Velan’s valves play a critical role in the world’s nuclear power stations. Jean-Luc Mazel, Industrial Director of Velan SAS, the French affiliate of Velan Inc, discusses safety, the aftermath of th...
Knowledge prevents bolt failure Adviser: When Bill Eccles was a design engineer, he noted that people generally agreed on many different things. “However, as far as nuts and bolts were concerned, everyone had different informatio...
Improving offshore safety through certification With nearly a quarter of a century of experience testing bolted connections at Det Norske Veritas (DNV), Andrzej Serednicki has carried out dozens of highly demanding tests to ensure the highest sa...
Railway safety lies in maintenance Railway system is a complex mode of transport with high demands on safety to eliminate the risk of accidents, hence the importance of bolt securing solutions.
Safe operations in extreme conditions A few years ago, Stefan Ladenburger took over as Managing Partner of Holzwerke Ladenburger, representing the third generation of this family business.
Physical testing guarantees joint safety “Development testing can disprove many of the common misconceptions surrounding joint failure,” says Dave Archer, President of Archetype Joint.
Providing an antidote to disaster Philippe Nouaille is responsible for overseeing how nuclear plants could be better secured against earthquakes – the natural disaster which gives nuclear engineers their biggest headaches.
Making life safer offshore Dropped objects are the single most common cause of serious accidents on offshore installations. But Norwegian engineer ­Johan Kolstø wanted to change that. He is the man responsible for the Statoi...
Nord-Lock introduces an extended wheel nut range Nord-Lock wheel nut is available from sizes M16-M24, offering increased safety for a wide range of on-and off-road vehicles.
Nord-Lock steel washers promise highest salt spray resistance on the market Nord-Lock wedge-locking washers guarantee high corrosion resistance after intensive testing of 1000 hours neutral salt spray test according to ISO 9227
Boltight embraces augmented reality tooling Have you ever wished you could try out a tool without the hassle of carrying it around on site? Now you can experience working with a tensioner and augmented reality directly from your mobile device.
Solutions to meet any bolting requirements We are showcasing our wide range of solutions including a new tool from Superbolt at Offshore Energy ‘18. Oil & Gas, offshore wind and marine energy are industries that need a wide array of bolting...
The Fastener Dimension Guide is here Rather than trying to find measurements from a table in standard sheets, you can simply enter the size and length of a bolt and find all the dimensions that conform to ISO standards.
Introducing Torquelator by Nord-Lock Torquelator by Nord-Lock calculates pre-load and corresponding torque for bolted joints secured with Nord-Lock washers.
Traceability down to material and batch of axle A dot pin marking that includes the Expander System brand will be fixed on each pivot pin, offering added value for users as it improves traceability and control.
Extended temperature range for usage of Nord-Lock steel washers Nord-Lock steel washers have been approved for temperatures down to -50°C by an independent test institute Swerea Kimab and TÜV.
Nord-Lock Group introduces Lifetime Warranty The Nord-Lock Group is proud to be the first bolting solutions partner to offer a full lifecycle warranty across all of its technologies.
Revolutionize tensioning with the new Superbolt VersaTite VersaTite by Superbolt allows hydraulic and mechanical tensioning and removal – all in one nut.
Simplify assembly with Nord-Lock combi bolt washers With our combi bolt washers you can improve assembly efficiency, accuracy and safety while at the same time keeping inventory and part count at a minimum.
Life in the engineering fast lane Attracting young talent to the manufacturing industry is getting increasingly challenging. So what can companies and academia do to attract young talent?
Nord-Lock Group acquires Expander Group Nord-Lock Group has acquired the Expander System, which specializes in the design and manufacturing of expandable pivot pin system.
A new range of washers for the steel construction industry Nord-Lock Steel Construction (SC) washers specially designed for use in structural steel parts and to fit HV sets and HR sets.
Nord-Lock supports Mexican students in global competition Nord-Lock Group sponsored team of engineering students has won first place in the Mexican national final of the Human Powered Vehicle Challenge.
Nord-Lock Group acquires main distributor in Korea Nord-Lock Group has signed an agreement to acquire all shares in its main distributor in South Korea, Nord-Lock Korea Co., Ltd.
Nord-Lock Group acquires Boltight Limited Nord-Lock Group acquires Boltight Limited, a leading hydraulic bolt tensioning company with a global reputation for innovation and excellent quality.
Bolt behavior and its elastic limits Have you wondered what happens when a bolt is being tightened? In this video, we explain the bolt behavior and its elastic limits.   
Watch: How does the Nord-Lock washer work? Nord-Lock washers secure bolted joints with tension instead of friction. Find out more about the locking method in this explanation video. Watch now
Watch: Installing EzFit expansion sleeve coupling bolt EzFit expansion sleeve coupling bolt was able to solve a problem when standard fitted coupling bolts were causing severe damage on the turbine couplings. Watch now
Watch: Boltight Typhoon bolt tensioners Widely used within Wind industry for the need of high-load, low profile solution for space-restricted applications that demand high and accurate preloads. Watch now
Watch: Boltight easy piston retraction pump Boltight’s piston retraction system takes the hard work out of reseting bolt tensioner piston stroke. Depending on the design of the tensioner, the pump will give automatic piston retraction or ass... Watch now
Watch: Irish Rail safely secured with Nord-Lock washers Safety is key on the railways. Irish Rail replaced the locking-wire mechanism on their wheel sets with Nord-Lock washers, watch them share their experience. Watch now
Watch: Get to know Expander System Expander System pivot pins allow you to avoid costly and time-consuming repairs that would normally involve welding and line boring. Watch now
Watch: Hydraulic tensioners for compact flanges Boltight’s Xtra Load range of bolt tensioners is used extensively in the offshore oil and gas industry for bolting compact flanges. Watch now
Watch: Tightening Boltight multi stud bolt tensioners Boltight multi stud bolt tensioner is designed to provide high and accurate preload within a minimum diameter envelope. Watch now
Watch: Installing a Boltight hydraulic bolt tensioner Designed with the benefit of more than 30 years experience in the field, Boltight has created a range of tools to meet the challenge of today’s hydraulic bolt tensioning requirements. Just watch ho... Watch now
Watch: Boltight subsea hydraulic bolt tensioners Subsea tensioners from Boltight conforms to the requirements of European Pressure Equipment Directive. They save time, money and protects the environment. Watch now
Watch: Tips on reusing Nord-Lock washers Nord-Lock washer is reusable, but the reusability depends on the conditions of usage. Basic steps should be conducted to verify full functionality and to ensure correct reassembly of the washers. W... Watch now
Watch: How multifunctional wedge-locking works? Designed with a combination of Nord-Lock wedge-locking to protect against spontaneous bolt loosening, and a spring effect to counter slackening due to settlement and relaxation.  Watch now
Watch: Verifying the locking function of Nord-Lock washers Nord-Lock washers are delivered pre-assembled in pairs to ensure correct mounting and ease of installation. The locking function of the Nord-Lock washers can be verified using some simple steps, wa... Watch now
Watch: Nord-Lock washers in the Junker vibration test Nord-Lock washers are compared with other locking methods in the Junker vibration test, according to DIN 65151, which is considered to be the most severe vibration test for bolted connections. Watch now
Watch: Presenting the Expansion bolts product video The Superbolt expansion bolts video demonstrates the challenges that installers are faced with when working with critical flange couplings and our solution, the Superbolt expansion bolts can help t... Watch now
Watch: ActSafe trusts the proven quality of Nord-Lock washers Securing bolted joints is about safety for installers and the public alike. Watch now
Watch: Check out our Superbolt product video This video explains Superbolt multi-jackbolt tensioner technology, demonstrates how it works, and illustrates how Superbolt tensioners can benefit you. Because only hand tools are needed for instal... Watch now
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