A-B17091511SM-AI HN, 5/16C GR5 YZOne New Aftermarket Replacement Hex Nut, 5 16" 18 Coarse Thread, Grade 5, Yellow Zinc Finish This 5 16" 18 UNC (coarse thread) Grade 5 finished hex nut features a yellow zinc chromate finish for corrosion resistance. Grade 5 hex nuts are manufactured from medium carbon steel to SAE J995 standards, with dimensional specifications governed by ASME B18. 2. 2. The yellow zinc finish provides a protective chromate coating that helps extend service life in
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