Critical Solutions

Enable precise preload and easy maintenance in high-torque transmission systems

Challenge: Gearboxes in naval vessels are subjected to high torque loads and dynamic forces. Bolted joints in these systems must maintain precise alignment and preload to ensure reliable power transmission.

Solution: Superbolt tensioners allow engineers to apply accurate preload without the need for large torque wrenches or specialized tools. This is especially valuable in confined engine rooms or propulsion compartments. The multi-jackbolt design distributes load evenly, reducing the risk of bolt fatigue and loosening under vibration. Maintenance is simplified, as tensioners can be inspected and retightened without disassembly, minimizing downtime during overhaul cycles.

Improve sealing and reduced downtime in high-pressure fluid systems

Challenge: Pumps onboard naval vessels handle critical fluids such as seawater, fuel, and hydraulic oil. These systems operate under high pressure and are prone to thermal cycling and vibration.

Solution: Superbolt tensioners improve sealing performance by maintaining consistent clamping force across pump flanges and housings. This reduces the likelihood of leaks and enhances system reliability. Their ease of installation and re-tensioning makes them ideal for shipboard environments where access is limited and maintenance windows are short. By preventing bolt loosening, Superbolt solutions also extend the service life of gaskets and seals.

Withstand hydrodynamic forces and allowed for easy inspection and replacement

Challenge: Hydrofoil systems are used to stabilize vessels at high speeds, especially in littoral combat ships and fast patrol craft. These systems experience fluctuating hydrodynamic forces and require robust bolting solutions.

Solution: Superbolt tensioners provide high-strength, vibration-resistant bolting for hydrofoil mounts and actuators. Their ability to maintain preload under dynamic loading ensures structural integrity and operational safety. Additionally, the modular design allows for easy inspection and replacement, which is critical for systems exposed to saltwater corrosion and mechanical wear. Finally, Nord-Lock Group manufactures tensioners in a variety of steels and alloys, each suited for different conditions and environments. By working with our expert team of engineers, we can solve your specific bolting challenges.

Use for precise alignment during equipment installation and maintenance

Challenge: Precision alignment is essential during the installation of propulsion shafts, gearboxes, and other rotating equipment. Misalignment can lead to vibration, wear, and premature failure.

Solution: Superbolt EzFit expansion bolts are used as temporary or permanent alignment tools during ship construction and maintenance. They allow fine-tuned adjustments and secure positioning of components before final bolting. This reduces the need for shimming or re-machining and ensures optimal alignment, while simultaneously reducing risk of operator injury.

Prevent loosening under vibration and thermal cycling in rotating machinery

Challenge: Diesel engines and generator sets are core components of naval propulsion and power systems. Bearings in these systems must be securely locked to prevent axial movement and maintain alignment.

Solution: Superbolt tensioners offer a reliable solution for securing bearings under high vibration and thermal cycling. Their multi-jackbolt design ensures uniform clamping force, reducing the risk of loosening and misalignment. This is especially important in vertical drive systems and motor-generator sets where bearing failure can lead to costly downtime and repairs. The nuts are also reusable and easy to inspect, supporting efficient maintenance practices.