Type Minimum; Tensile; Strength Material 1/4 5/16 3/8 7/16 S.A.E 2 Steel 74000 P.S.I Low Carbon 6 12 20 32 S.A.E. 5 Steel 120000 P.S.I Medium Carbon Heat Treat 10 19 33 54 S.A.E. 7 Steel 133000 P.S.I Medium Carbon Alloy 13 25 44 71
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