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fastener proof load?
3

thread725-28789

fastener proof load?

fastener proof load?

(OP)
could someone explain proof loading of fasteners to me?

thanks

RE: fastener proof load?

3
The proof load of a fastener is the maximum load under which no permanent deformation occurs, i.e. all strain is elastic and recoverable.  Materials specifications define the proof load as 90% of the yield strength.

During testing, the fastener is initially measured, then loaded to the proof load.  The load is then released, and the part re-measured.  The part meets the requirement if the part has not experienced any length change.

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