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dressing/deburring threads

dressing/deburring threads

dressing/deburring threads

I'm working with special lift cleats on a vessel to which ANSI N14-6 applies.

N14-6, 1993, para 6.4.2 states: "Defective bolts, studs, and nuts shall be replaced rather than repaired."

I have no problem with that statement for structurally damaged bolting.

The subject bolting is specially fabricated ACME threaded Inconel fasteners that run about $5k each so discarding them unnecessarily is undesirable.

We require that the bolts thread into the hole by hand in a test fitting. we want to ensure the bolts are burr and ding free before installing. If a burr if found, we stone it off. Generally after a burr is stoned off, it is hard to find the location where the stoning took place.

We periodically load test the bolts to 300% load as required in N14-6 and we did so after the threads were last stoned on several bolts.

My question is, does anyone have a reference, preferably a code or standard, for defining a "damaged" bolt or justifying that stoning a burr on a thread is not "repair".



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