Zinc Coating or Hot-Dip Galvanizing Specification  for Anchor Bolts and Hardware

The ASTM A153/A153M specification applies to hot-dip galvanizing or zinc coating of iron and steel hardware.  ASTM A153 specifies the following requirements:

•  Coating Thickness/Weight – depends on the material category and steel thickness, values are listed in the table below.
• Threaded Products – areas with threads are not subject to the coating thickness requirement.
• Finish – continuous, smooth, uniform
• Embrittlement – high tensile strength fasteners (>150ksi) and castings can be subject to embrittlement
• Appearance – free from uncoated areas, blisters, flux deposits and gross dross inclusions as well as having no heavy zinc deposits that interfere with intended use
• Adhereence – the entire coating should have a strong adherence throughout the service life of hot-dip galvanized steel *

ASTM F2329 for Anchor Bolts

ASTM F2329 is an update approved in 2005 to replace ASTM A153 Class C which is the standard specificatuon for zinc coating or hot-dip galvanizing of carbon and alloy steel bolts, screws, washers, nuts and special threaded fasteners.