12.9 vs a4-80 vs 18-8 vs 10.9 vs a2-70 vs 304 vs 316

Bolts
Material/Grade 12.9 A4-80 18-8 10.9 A2-70 304 316
Type High Tensile Bolt Grade Stainless Steel Bolt Stainless Steel High Tensile Bolt Grade Stainless Steel Bolt Stainless Steel Stainless Steel
Tensile Strength (MPa) 1220 800 515-860 1040 700 515 515
Yield Strength (MPa) 1100 600 205-450 940 450 205 205
Corrosion Resistance Low High Moderate Low Moderate Moderate High
Common Uses Automotive, heavy machinery, and high-stress applications Marine, chemical, and high-corrosion environments General-purpose, food processing, and construction Automotive, machinery, and structural applications General-purpose, outdoor, and mildly corrosive environments General-purpose, food processing, and appliances Marine, chemical, and high-corrosion environments
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