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 ASTM F3393, which is itself a combination of three coating standards, F1136, F2833, and F3019.
ASTM Committee F16 is currently conducting additional research on the acceptability of hot-dip galvanizing on A490 bolts.
Portland Bolt galvanizes threaded fasteners all day, every day in our 12′ long x 4′ wide x 7′ deep zinc tank. Our expertise, specialized galvanizing line, and inspection processes ensure fast delivery times, clean threads, and trouble-free nut fit.