A-B17091633SM-AI HN, 9/16F GR B PHOSPHOne New Aftermarket Replacement Hex Nut 9 16" 18 UNF, Grade B, Phosphate Finish This 9 16" 18 UNF (fine thread) hex nut is a Grade B carbon steel fastener with a phosphate (black phosphate) finish. Phosphate coated hex nuts offer improved corrosion resistance and paint adhesion compared to plain steel, making them a common choice in agricultural, construction, and industrial equipment assembly and repair. The six sided profile accepts standard 7 8"
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