The Experts: Tightening Superbolt

Q: Why should I tighten a Superbolt initially in a crosswise pattern?

A: The crosswise pattern is necessary because the main thread of the multi-jackbolt tensioners needs to be centered with the main thread of the stud during the whole tightening procedure.

This is to prevent an uneven load distribution in the nut body. After you have tightened the jackbolts crosswise with 100% recommended torque, change to a circular tightening pattern to tighten all jackbolts to their full capacity.

Note: Loosening always uses a circular pattern.

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