Clogged threads are caused by poor drainage of a threaded section after the product is withdrawn from the galvanizing kettle. Clogged threads, as seen to the left, can be cleaned by using post-galvanizing cleaning operations such as a centrifuge or by heating them with a torch to approximately 500 F (260 C) and then brushing them off with a wire brush to remove the excess zinc. The clogged threads must be cleaned before the part will meet the specification.

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Alana Hochstein

Hi Randy. As the article mentions, excess zinc on the threads can be removed by heating them with a torch to approximately 500F (260 C) and then brushing them off with a wire brush to remove the excess zinc.  If needed, the area can be touched up after wire brushing by using a zinc rich paint.

Randy Busch

We have some 1”-8 x 7” lg threaded studs that have area’s up built up galvanizing, is there any easy repair methods for this problem?

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