What hot-dip galvanizing specifications cover tie rod assemblies?

As a threaded fastener, the rods are galvanized to ASTM A153 Class C or F2329,, while the clevis and turnbuckle forgings are galvanized to ASTM A153 Class B. The forgings we use are tapped oversized per ASTM A563 to allow for the galvanization thickness of rods since A153 only allows for threads to be tapped oversized but does not give tolerances to follow. Without the threads being tapped oversize, the rods would not be able to thread onto the clevises and turnbuckles. The chasing of threads is not allowed per either galvanizing specifications A153 or F2339.

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