Nord-Lock Group Insights Tightening Superbolt

Tightening Superbolt

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

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.

More insights and references

The Experts: Why do Superbolt multi-jackbolt tensioners prevent loss of preload? Superbolts have been used in numerous demanding bolting applications with extreme working loads and high vibrations. What mechanical principle of Superbolts prevent loss of preload? Leggi di più
How to determine a suitable tightening torque I don’t know the tightening accuracy of my tool. How should I proceed with my torque calculation? Leggi di più
How to Optimize a Bolted Joint Through Clamped Length? Clamped length is the free length of a bolt that is stretched under tension. Find out what is the optimal bolt length that you should consider. Leggi di più
The Experts: Getting the most out of fasteners Before you re-use bolts, you should always consider the security level of the assembly and economic factors. Leggi di più
The Experts: Superbolt – your flexible friend How does the added flexibility of Superbolt improve the bolted joint? Leggi di più

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