Category Archives: FAQ

F1554 Grade 36/55 Substitution Clause

Grade Tensile Strength, ksi (MPa) Description Yield Strength, min, ksi (MPa) Size Range, in. (mm) 36A 58 – 80 (400 – 558) 36 (248) 1⁄4 – 4 (6.4 – 102) 55 75 – 95 (517 – 655) 55 (380) 1⁄4 – 4 (6.4 – 102) 105 125 – 150 (862 – 1034) 105 (724) 1⁄4... Read more

Grade Tensile Strength, ksi (MPa) Description Yield Strength, min, ksi (MPa) Size Range, in. (mm) 36A 58 – 80 (400 – 558) 36 (248) 1⁄4 – 4 (6.4 – 102) 55 75 – 95 (517 – 655) 55 (380) 1⁄4 – 4 (6.4 – 102) 105 125 – 150 (862 – 1034) 105 (724) 1⁄4... Read more

Which Bolt Grades can be Galvanized?

Grade Can I Galvanize? Raw material Nominal Size Minimum Yield Strength Minimum Tensile Strength Minimum Hardness ASTM F1554 Grade 55 Yes Low Alloy Steel 1⁄2” – 4″ 55 75 – ASTM F3125/A325 Yes Medium Carbon Steel, Quenched and Tempered 1⁄2” – 11⁄2“ 92 120 C25 ASTM A449 Yes 1⁄4” – 1″11⁄8” – 11⁄2“15⁄8” – 3″ 928158... Read more

Grade Can I Galvanize? Raw material Nominal Size Minimum Yield Strength Minimum Tensile Strength Minimum Hardness ASTM F1554 Grade 55 Yes Low Alloy Steel 1⁄2” – 4″ 55 75 – ASTM F3125/A325 Yes Medium Carbon Steel, Quenched and Tempered 1⁄2” – 11⁄2“ 92 120 C25 ASTM A449 Yes 1⁄4” – 1″11⁄8” – 11⁄2“15⁄8” – 3″ 928158... Read more

ASTM Equivalents for Metric Grades

Diameter Range Metric Grade Approximate ASTM Equivalent Description Tensile, min Yield, min Mpa ksi Mpa ksi All 4.6 A307A Low or medium carbon steel 400 58 240 35 through 1″ (M24) 5.8 – Cold worked low or medium carbon steel 520 75 420 61 through 1″ (M24) 8.8 A449 / F3125 Grade A325 Heat treated... Read more

Diameter Range Metric Grade Approximate ASTM Equivalent Description Tensile, min Yield, min Mpa ksi Mpa ksi All 4.6 A307A Low or medium carbon steel 400 58 240 35 through 1″ (M24) 5.8 – Cold worked low or medium carbon steel 520 75 420 61 through 1″ (M24) 8.8 A449 / F3125 Grade A325 Heat treated... Read more