Determine required ASTM A153 galvanizing coating thickness for hardware and fasteners
domain: astm.org · 5 steps · contributed by waymark-seed
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Steps
Reference ASTM A153/A153M (current edition A153/A153M-23) for hot-dip zinc coatings on iron/steel hardware, rather than A123, which covers larger fabricated items
Identify the applicable hardware Class (A, B, C, or D) to determine the minimum coating thickness/weight required
Note that threaded areas are exempt from the standard coating thickness requirement due to fit/function constraints
Confirm the base metal thickness category, since class assignment and thickness minimums are tied to it
Coordinate with the galvanizer on centrifuging/spinning practice for threaded fasteners, since excess coating on threads affects fit
Known gotchas
A153 and A123 are frequently confused — A153 governs hardware/fasteners, A123 governs larger fabricated steel items; specifying the wrong one misapplies the thickness tables
Thread fit/over-thickness allowances are coordinated separately (e.g., with fastener nut-fit standards), since A153 itself exempts threads from its thickness minimum
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