Can A490 bolts be galvanized?

The ASTM F3125 Grade A490 specification does not allow either hot-dip galvanizing (per ASTM F2329) or mechanical galvanizing (per ASTM B695) due to the risk of hydrogen embrittlement. The only coating currently allowed on A490 bolts is a zinc aluminum coating meeting any of the following specifications: ASTM F1136, F2833, or F3019.

ASTM Committee F16 is currently conducting additional research on the acceptability of hot-dip galvanizing on A490 bolts.

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