The Superbolt multi-jackbolt tensioner (MJT) takes the high preload requirements in large diameter bolting and breaks it down into manageable torques using the jackbolts threaded through the nut body. They remain easy to install, even on larger sizes, compared to standard hex nuts.

The advantage of using Superbolt Mechanical Tensioners

For example. One would need 18,925 ft/lb of torque to stress a 3" stud to 428,000 lbs using a hex nut. With a 3" MTX Supernut, only 114 ft/lbs on each of the jackbolts is needed to produce the same bolt load.

Multi-jackbolt tensioners (MJTs) offer many benefits when compared to other common bolting methods. They are fast, safe and easy to use.
  • Tremendous clamping force available.
  • Low torque requirement – only hand tools needed.
  • Safe method for installation personnel.
  • Reduces installation time over common methods.
  • Tightens stud/bolts in pure tension.
    - No thread galling.
    - No need for tight tolerance threads which can seize.
    - Studs will not seize into housing.
  • Tensioner flexibility adds elasticity to studs/bolts to create a better bolted joint.
  • Fits in restricted areas.
  • Provides even tension from stud to stud.
  • Accurate within 10% of specified bolt tension.
  • Ease of removal.