Button Head Cap Screw Material

All Imperial

Black-Oxide Alloy Steel Grade 8

304 Stainless Steel

316 Stainless Steel

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All Metric

Black-Oxide Alloy Steel Grade 12.9	Zinc Plated Grade 12.9
Stainless Steel
A2 Stainless Steel [Equivalent 304 SS]	A4 Stainless Steel [Equivalent 316 SS]