Preload accuracy

A measure of the precision with which a given tool or procedure creates preload in a bolt when the bolt is tightened.  A common torque wrench, for example, is said to produce preload with an accuracy of +30%.  The mean preload, however, may not be that which the designer intended, or may not be what he should have intended.  Accuracy as used here, in other words, is synonymous with Scatter.

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