High Flexibility for Tighter and More Permanent Joints

The increased elasticity of Multi-Jackbolt Supernut® tensioners on high temperature flange and joint applications is critical to permanent sealing under operating conditions. Increasing bolting elasticity can compensate for flange and joint instability caused by temperature changes, changes in internal pressure and joint movement.

The flexing action in Superbolt® nut type tensioners is also beneficial in reducing stress concentrations on the male thread. When the jackbolts are tightened, the nut body flexes in slightly at the top (clamping the threads tighter) and flexes out at the bottom. This nut body flexing removes stress concentrations from the first few threads (as is common in hex nuts) and distributes the stresses more evenly along the entire length of the threaded area, significantly improving load capacity and fatigue resistance.