The Nord-Lock Group manufactures patented Superbolt multi-jackbolt
tensioners designed to eliminate unsafe and time consuming bolting
MJTs replace or retrofit existing nuts and bolts, and only
require hand/air tools for installation and removal of any size
A “Superbolt” or “multi-jackbolt tensioner (MJT)” is a direct replacement
for hex nuts, covered nuts, bolts, etc. They spin onto your existing
bolt or stud and provide a better way to bolt up your joint. They
consist of three components:
A hardened washer protects your equipment and provides a hardened, flat surface for the jackbolts to "push" against.
The nut body spins on your existing bolt or stud and seats against the
washer hand tight (Superbolt® nut bodies are typically round).
The Jackbolts thread through the nut body and are used to tighten the joint in pure tension, using ordinary hand tools.