Determination of Fastener Friction

Preload-Friction Graph Test fasteners can be mounted in a test rig to allow the thread and head friction torques to be determined. From these results the thread and nut face friction coefficients can be determined. These values are of importance to allow an assessment of what effect various joint surfaces can have on the bolt torque-preload relationship. Such tests can be completed, for example, to assess the effect that introduction of new fastener finishes will have a joint performance.

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