Bolt Depot - Bolt Grade Markings and Strength Chart
Grade 8 Medium carbon alloy steel, quenched and tempered 1/4" thru 1-1/2" 120,000 130,000 150,000 Grade A325 Carbon or alloy steel with or without boron 1/2" thru 1-1/2" 85,000 92,000 120,000 Stainless Markings Vary 18-8 & 316 Stainless Steel alloy with chromium and nickel All sizes thru 1" N/A 20,000 Min. 65,000 Typical
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