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Superbolt® EzFit

Address the demands of rotating coupling with our EzFit coupling bolt solution, providing secure bolt transfer of forces to shear while ensuring reliable performance in critical applications.

  • About Superbolt
  • EzFit
  • CAD files | Superbolt
image

THE EASY WAY TO INSTALL COUPLING BOLTS

EzFit mechanical expansion bolts offer tremendous radial expansion and joint clamping power in one bolting system. They are specially designed for rotating couplings or alignment systems that require the bolts to transfer forces in shear.

This innovative product replaces large fitted or interference-fit bolts, no modifications required. The key to this solution is the split expansion sleeve that mates with the customers' machined holes. The split sleeve requires less tolerance on mating parts than is traditionally required with interference-fit, saving critical machining time.

Additional information

How it works

The mechanical tensioner at the small end of the taper stud (side A) pulls the stud into the expanding split sleeve for radial preloading.

The split sleeve expands and exerts a large radial force into the bores of the coupling bolt holes to give a truly fitted bolt.

The mechanical tensioner at the large end of the taper stud (side B) provides the axial clamping forces.

In removal, the large end tensioner (side B) is used to pull the stud out of the sleeve, which then collapses for easy withdrawal from the hole.

EzFit components

  • Tapered stud
  • Split tapered bore sleeve
  • Positioning spacer
  • MJT and hardened washer

Standard Range

EzFit mechanical expansion bolts can be designed using the latest FEA technology for any type of coupling with bolts of diameter 20mm (3/4″) or upwards.

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

A type

Superbolt_EzFit_A-Type.png

  • Mechanical expansion bolt for threadless bore
  • Access and operation from one side
  • Dimensions on request

 


B type

Superbolt_EzFit_B-Type.png

  • Mechanical expansion bolt for blind holes
  • Access and operation from one side
  • Ø 28 – 165 mm
 
 
 

C type

Superbolt_EzFit_C-Type.png

  • Mechanical expansion bolt for through-holes
  • Access and operation from both sides
  • Ø 28 – 165 mm

Product Benefits

Replacement without modification

The innovative EzFit expansion sleeve coupling bolt from Superbolt lets you replace large fitted or interference-fit bolts without modifying your equipment, optimizing drive and preventing coupling slippage.

High preloads with hand tools alone

Integral Superbolt multi-jackbolt tensioners (MJTs) enable EzFit to attain extremely high preloads with simple hand tools alone.

Accurate radial force

EzFit’s split, tapered bore sleeve also provides a true radial force that translates to greater flange connection rigidity and eliminates harmful micro-movements at the split line. Because the sleeve can compensate for a wider range of bore tolerances, it simplifies machining and installation.

Testing & Certification

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

 

Certificates:

  • ABS (American Bureau of Shipping)
  • DNV (Det Norske Veritas)
  • LRS (Lloyd’s Register of Shipping)

Downloads

Downloads

Download

View

  • Tensioning - Application Checklist.pdf

  • Superbolt EzFit 4-Page Brochure 2025.pdf

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