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  4. Socket Head Cap Screws
  5. ASME B18.3 Hexagon Socket Head Cap Screws

ASME B18.3 Hexagon Socket Head Cap Screws

HEXAGON SOCKET HEAD CAP SCREW INCH THREAD

Nominal Size D A H J T G LT
Body Dia Across Flats Height Hexagon Socket Size Key Engagement Wall Thickness Thread Length for Bolt Lengths
Max Min Max Min Max Min Nom Min Min Min
1/4" 6.35 6.19 9.52 9.28 6.35 6.2 4.78 3.05 2.42 25.4
5/16" 7.93 7.76 11.91 11.61 7.92 7.78 6.35 3.84 3.03 28.45
3/8" 9.52 9.35 14.27 13.97 9.52 9.35 7.92 4.63 3.64 31.75
7/16" 11.11 10.91 16.66 16.31 11.12 10.93 9.53 5.41 4.22 35.06
1/2" 12.7 12.5 19.05 18.67 12.7 12.5 9.53 6.23 4.83 38.1
5/8" 15.87 15.66 23.82 23.4 15.87 15.65 12.7 7.8 6.05 44.45
3/4" 19.05 18.82 28.57 28.12 19.05 18.8 15.88 9.4 7.24 50.8
7/8" 22.22 21.97 33.32 32.85 22.22 21.95 19.05 10.98 8.46 57.15
1" 25.4 25.11 38.1 37.57 25.4 25.1 19.05 12.58 9.66 63.5
1 1/8" 28.57 28.16 42.87 42.3 28.57 28.22 22.23 14.15 10.88 71.38
1 1/4" 31.75 31.34 47.62 47.05 31.75 31.4 22.23 15.75 12.07 79.25
1 3/8" 34.92 34.47 52.37 51.77 34.92 34.55 25.4 17.33 13.29 87.38
1 1/2" 38.1 37.64 57.15 56.49 38.1 37.72 25.4 18.93 14.48 95.25
1 3/4" 44.45 43.94 66.67 65.97 44.45 44.05 31.75 22.1 16.9 111.26
2" 50.8 50.25 76.2 75.44 50.8 50.37 38.1 25.28 19.31 127
2 1/4" 57.15 56.6 85.72 84.94 57.15 56.7 44.45 28.45 21.72 142.75
2 1/2" 63.5 62.9 95.25 94.42 63.5 63.02 44.45 31.63 24.13 158.75
2 3/4" 69.85 69.25 104.77 103.89 69.85 69.35 50.8 34.8 26.55 174.76
3" 76.2 75.6 114.3 113.39 76.2 75.67 57.15 37.98 28.96 190.5
3 1/4" 82.55 81.95 123.82 122.86 82.55 82 57.15 41.15 31.37 206.25
3 1/2" 88.9 88.3 133.35 132.36 88.9 88.35 69.85 44.33 33.79 222.25
3 1/4" 95.25 94.65 142.87 141.84 95.25 94.67 69.85 47.5 36.2 238.26
4" 101.6 101 152.4 151.34 101.6 101 76.2 50.68 38.61 254