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The Importance of Perfect Preload

Never underestimate the importance of preload. Failing to achieve the correct amount can have devastating and far-reaching consequences. Here, we’ll address two of the most common failures that can occur in the event of insufficient preload.

Mechanical overload failure – including embedment, crushing, yielding and fracturing – is nothing you ever want to deal with. But excessive preload can result in exactly that. Too much applied torque will lead to failure at assembly, and the consequences of that can have a domino effect. This will add to subsequent service loads and exceed the strength of the fastener/joint material.

Specific problem areas related to mechanical overload failure include differing thermal expansion rates, material, and creep especially when the joints contain plastic or gaskets.

Insufficient preload can lead to transverse slip of joint members, which in turn can cause loosening. Self-loosening, leaks, slippage, squeaks and rattles are all things you don’t want. Ensuring that the preload is sufficient will help avoid a lack of clamp force and the ensuing effects.

Obviously, the importance of preload cannot be ignored. Failing to implement the correct amount will certainly lead to issues and complications you’d rather not have to deal with.

Interested in learning more about the importance of preload and the potential consequences of failing to use a sufficient preload? Contact us at ProvenProductivity@bossard.com!


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October 30, 2015

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