ASTM A153

Zinc coating (hot dip) on iron and steel hardware.

ASTM B695

Mechanically deposited zinc coatings on iron and steel.

ASTM F1941

Electrodeposited coatings on threaded fasteners (Zinc plating).

ASTM F2329

Zinc coating, hot dip, for bolts, screws, washers, nuts, and special threaded fasteners.

AASHTO M232

The AASHTO M232 specification covers zinc coating (hot-dip) on iron and steel hardware.  A newer and more fastener-appropriate specification, designed to replace M232 Class C, approved in 2005 and covering the requirement for hot-dip galvanizing bolts, screws, nuts, washers, and other threaded fasteners is ASTM F2329. It is slowly becoming more widely used and referenced, but... Read more