Hydraulic Expansion Bolts

Superbolt was the world’s first to revolutionize nuts and bolts with multi-jackbolt tensioning (MJT) technology. Our technology has been proven in tens of thousands of successful installations and we continue to develop a multitude of solutions to solve the next generation of bolting challenges.

Superbolt HyFit


HyFit, the hydraulically operated expansion bolt by Superbolt, has been designed to address safety concerns expressed by many current users of hydraulic coupling bolts.

In also providing the solution for coupling maintenance where standard-type “fitted” bolts cause major outage delays, its application solves most large coupling bolt issues in a totally unique package.


HyFit hydraulic expansion bolts can be designed using latest FEA technology for any type of coupling with bolts of diameter 40mm (1-9/16″) or upwards.

Unique features and advantages of both hydraulic and mechanical expansion sleeve coupling bolts can be combined to best suit your specific requirements.

Product Supply
HyFit hydraulic expansion bolts For all types of turbines and all designs of couplings 40mm (1-9/16”) diameter upwards
HyFit Sleeves Competitively priced, short delivery time
HyFit Alignment Coupling alignment tools for ease of coupling assembly
HyFit Pumps All types of pumps, fittings and gages
Engineering Bolt design, materials and coupling design support
Refurbishment Refurb & servicing for bolt systems and pumps
Installation On-site supervision of installation

Ensure safe installation

HyFit is an advanced solution delivering extra-safe high-performance torque transmission for critical high-load rotating shafts and couplings.

Widely used in applications such as steam turbines, gas turbines, hydro turbines, wind turbines, motors, generators, propulsion shafts, propeller blades and more.


  • Truly fitted bolt
  • Easily installed and removed in clearance condition
  • Accommodates varying hole sizes
  • Provides accurate maintenance scheduling
  • Fully reusable – only requires sleeve replacement in the case of rotor change
  • No bolt/hole damage, no re-work required
  • Reduces maintenance costs
  • Improves efficiency
  • Maximizes plant availability
  • Minimizes coupling breakout/make up times
  • Quickly and easily regains alignment and concentricity


Testing & Certification

Superbolt products have been rigorously tested and approved by independent institutes as well as certification authorities.

Customer success stories

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