Socket Head Cap Screw Key Information and Head Dimensions Screw Size No. 0 No. 1 No. 2 No. 3 No. 4 No. 5 Decimal Approx. 0.060" 0.073" 0.086" 0.099" 0.112" 0.125" Hex Key Size 0.050" 1/16" 5/64" 5/64" 3/32" 3/32" Head Dia. 0.096" 0.118" 0.140" 0.161" 0.183" 0.205" Head Height 0.060" 0.073" 0.086" 0.099" 0.112" 0.125" Screw Size No. 6 No. 8 No. 10 No. 12 1/4" Decimal Approx. 0.138" 0.164" 0.190" 0.216" ___ Hex Key Size 7/64" 9/64" 5/32" 5/32" 3/16" Head Dia. 0.226" 0.270" 0.312" 0.324" 3/8" Head Height 0.138" 0.164" 0.190" 0.216" 1/4" Screw Size 5/16" 3/8" 7/16" 1/2" 9/16" 5/8" 3/4" 7/8" 1" Hex Key Size 1/4" 5/16" 3/8" 3/8" 7/16" 1/2" 5/8" 3/4" 3/4" Head Dia. 15/32" 9/16" 21/32" 3/4" 27/32" 15/16" 1 1/8" 1 5/16" 1 1/2" Head Height 5/16" 3/8" 7/16" 1/2" 9/16" 5/8" 3/4" 7/8" 1" Screw Size 1 1/8" 1 1/4" 1 3/8" 1 1/2" 1 3/4" 2" 2 1/4" 2 1/2" 3" Hex Key Size 7/8" 7/8" 1" 1" 1 1/4" 1 1/2" 1 3/4" 1 3/4" 2 1/4" Head Dia. 1 11/16" 1 7/8" 2 1/16" 2 1/4" 2 5/8" 3" 3 3/8" 3 3/4" 4 1/2" Head Height 1 1/8" 1 1/4" 1 3/8" 1 1/2" 1 3/4" 2" 2 1/4" 2 1/2" 3" Socket Head Cap Screw Thread Length Information for Alloy Steel Screw Size No. 0 No. 1 No. 2 No. 3 No. 4 No. 5 No. 6 Min. Thread Lg. 1/2" 5/8" 5/8" 5/8" 3/4" 3/4" 3/4" Max. Thread Lg. 9/16" 7/8" 7/8" 7/8" 1 3/16" 1 3/16" 1 3/16" Screw Size No. 8 No. 10 No. 12 1/4" 5/16" 3/8" 7/16" Min. Thread Lg. 7/8" 7/8" 15/16" 1" 1 1/8" 1 1/4" 1 3/8" Max. Thread Lg. 1 5/16" 1 3/8" 1 3/8" 1 1/2" 1 11/16" 1 13/16" 2" Screw Size 1/2" 9/16" 5/8" 3/4" 7/8" 1" 1 1/8" 1 1/4" Min. Thread Lg. 1 1/2" 1 5/8" 1 3/4" 2" 2 1/4" 2 1/2" 2 13/16" 3 1/8" Max. Thread Lg. 2 7/16" 3" 2 3/4" 3 1/4" 3 9/16" 3 7/8" 4 11/16" 5 1/8" Screw Size 1 3/8" 1 1/2" 1 3/4" 2" 2 1/4" 2 1/2" 3" Min. Thread Lg. 3 7/16" 3 3/4" 4 3/8" 5" 5 5/8" 6 1/4" 7 1/2" Max. Thread Lg. 5 9/16" 6 1/8" 7 1/8" 8 1/8" 9" 10" 11 3/4"
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