ASTM 193 B7
ASTM 193 B7
(OP)
Why is it so common to see ASTM 193 Grade B7 bolt with ASTM 194 Grade 2H nut? Why not use a ASTM 194 Grade 7 heavy hex nut with the same chromoly composition? The same spec. commonly calls for zinc plating both items. Why zinc plate a "stainless" bolt? Especially for pipe flanges that may encounter saltwater/other minerals or bolt together components that are not all on the same galvanic series, such as ductile valve w/ galv. pipe. Wouldn't the zinc wear away rather quickly?





RE: ASTM 193 B7
RE: ASTM 193 B7