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. Superbolt tensioners remain easy to install, even on larger sizes, compared to standard hex nuts.

The advantage is obvious, but how exactly do our multi-jackbolt tensioners achieve this? The hardened washer is installed first. Then the nut body is threaded onto the existing stud or bolt, hand tight against the washer. The jackbolts are then tightened and thrust against the hardened washer. Accurate preload is achieved on the stud by torquing the jackbolts.

Advantages of Superbolt tensioners

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.