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    2. B18.2.1 Heavy Hex Cap Screws Dimensions

    B18.2.1 Heavy Hex Cap Screws Dimensions

    Heavy-duty hex cap screws with larger heads for increased load capacity

    B18.2.1 Heavy Hex Cap Screws Dimension Standard provide enhanced strength and larger bearing surfaces for demanding structural applications.

    ASME B18.2.1 Heavy Hex Cap Screws

    ASME B18.2.1 Heavy Hex Cap Screws Dimensions

    Nominal Size Body Diameter, E Width Across Flats, F Width Across Corners, G Head Height, H Minimum Wrenching Height, J Thread Length, LT Transition Thread Length, Y Maximum Total Runout of Bearing Surface FIM
    Max. Min. Basic Max. Min. Max. Min. Basic Max. Min. >6" <6" Reference
    ASME B18.2.1 - 3⁄8 9.53 9.53 9.14 17.46 17.48 16.99 20.17 19.38 5.95 6.17 5.74 4.06 25.40 31.75 7.92 0.36
    ASME B18.2.1 - 1⁄2 12.70 12.70 12.24 22.23 22.23 21.59 25.65 24.61 7.94 8.20 7.67 5.46 31.75 38.10 9.78 0.41
    ASME B18.2.1 - 5⁄8 15.88 15.88 15.37 26.99 26.97 26.19 31.17 29.85 9.92 10.24 9.60 6.83 38.10 44.45 11.56 0.48
    ASME B18.2.1 - 3⁄4 19.05 19.05 18.52 31.75 31.75 30.78 36.65 35.13 11.91 12.27 11.56 8.23 44.45 50.80 12.70 0.56
    ASME B18.2.1 - 7⁄8 22.23 22.23 21.64 36.51 36.53 35.41 42.16 40.36 13.89 14.30 13.49 9.60 50.80 57.15 14.12 0.64
    ASME B18.2.1 - 1 25.40 25.40 24.79 41.28 41.28 40.01 47.65 45.62 15.48 15.93 15.01 10.57 57.15 63.50 15.88 0.71
    ASME B18.2.1 - 1 1⁄8 28.58 28.58 27.89 46.04 46.02 44.60 53.16 50.85 17.46 18.24 16.71 11.71 63.50 69.85 18.14 0.81
    ASME B18.2.1 - 1 1⁄4 31.75 31.75 31.06 50.80 50.80 49.23 58.65 56.11 19.84 20.65 19.02 13.46 69.85 76.20 18.14 0.89
    ASME B18.2.1 - 1 3⁄8 34.93 34.93 34.16 55.56 55.58 53.82 64.16 61.37 21.43 22.30 20.57 14.45 76.20 82.55 21.16 0.97
    ASME B18.2.1 - 1 1⁄2 38.10 38.10 37.34 60.33 60.33 58.42 69.65 66.60 23.81 24.74 22.91 16.26 82.55 88.90 21.16 1.04
    ASME B18.2.1 - 1 5⁄8 41.28 41.28 40.41 65.09 65.07 63.02 75.16 71.86 25.40 26.37 24.43 17.63 88.90 95.25 23.09 1.12
    ASME B18.2.1 - 1 3⁄4 44.45 44.45 43.59 69.85 69.85 67.61 80.65 77.09 27.78 28.80 26.77 19.00 95.25 101.60 25.40 1.22
    ASME B18.2.1 - 1 7⁄8 47.63 47.63 46.71 74.61 74.63 72.24 86.16 82.35 29.37 30.43 28.30 20.37 101.60 107.95 25.40 1.32
    ASME B18.2.1 - 2 50.80 50.80 49.89 79.38 79.38 76.84 91.64 87.60 30.96 32.08 29.85 20.96 107.95 114.30 28.22 1.40
    ASME B18.2.1 - 2 1⁄4 57.15 57.15 56.24 88.90 88.90 86.06 102.64 98.09 34.93 36.14 33.71 23.70 ... 127.00 28.22 1.55
    ASME B18.2.1 - 2 1⁄2 63.50 63.50 62.51 98.43 98.43 95.25 113.64 108.59 30.96 40.21 37.57 26.47 ... 139.70 31.75 1.73
    ASME B18.2.1 - 2 3⁄4 69.85 69.85 68.86 107.95 107.95 104.44 124.64 119.08 26.99 44.30 41.45 29.24 ... 152.40 31.75 1.88
    ASME B18.2.1 - 3 76.20 76.20 75.21 117.48 117.48 113.67 135.64 129.59 47.63 49.15 46.10 32.77 ... 165.10 31.75 2.06
    ASME B18.2.1 - 3 1⁄4 82.55 82.55 81.53 127.00 127.00 122.89 146.66 140.08 50.80 54.00 50.75 35.53 ... 177.80 31.75 2.31
    ASME B18.2.1 - 3 1⁄2 88.90 88.90 87.91 136.53 136.53 132.08 157.66 150.57 57.15 57.30 53.85 37.69 ... 190.50 31.75 2.49
    ASME B18.2.1 - 3 3⁄4 95.25 95.25 94.26 146.05 146.05 141.27 168.66 161.06 60.33 62.15 58.50 40.94 ... 203.20 31.75 2.67
    ASME B18.2.1 - 4 101.60 101.60 100.61 155.58 155.58 150.50 179.65 171.58 63.50 65.43 61.57 43.10 ... 215.90 31.75 2.84
    ASME B18.2.1 - 4 1⁄4 107.95 107.95 107.26 165.10 165.10 159.72 190.65 182.07 69.85 70.31 66.24 46.38 ... 228.60 31.75 3.02
    ASME B18.2.1 - 4 1⁄2 114.30 114.30 113.61 174.63 174.63 168.91 201.65 192.56 73.03 73.56 69.29 48.51 ... 241.30 31.75 3.20
    ASME B18.2.1 - 4 3⁄4 120.65 120.65 119.96 184.15 184.15 178.10 212.65 203.05 76.20 78.44 73.96 51.77 ... 254.00 31.75 3.38
    ASME B18.2.1 - 5 127.00 127.00 126.30 193.68 193.68 187.33 223.65 213.56 79.38 81.71 77.04 53.92 ... 266.70 31.75 3.56
    ASME B18.2.1 - 5 1⁄4 133.35 133.35 132.65 203.20 203.20 196.55 234.65 224.05 85.73 86.56 81.69 57.18 ... 279.40 31.75 3.73
    ASME B18.2.1 - 5 1⁄2 139.70 139.70 139.00 212.73 212.73 205.74 245.64 234.54 88.90 89.87 84.79 59.36 ... 292.10 31.75 3.91
    ASME B18.2.1 - 5 3⁄4 146.05 146.05 145.35 222.25 222.25 214.93 256.64 245.03 92.08 94.72 89.43 62.61 ... 304.80 31.75 4.09
    ASME B18.2.1 - 6 152.40 152.40 151.70 231.78 231.78 224.16 267.64 255.52 95.25 97.99 92.51 64.74 ... 317.50 31.75 4.27
    • GENERAL NOTES:
      • (a) Wrenching Height, J. Wrenching height is a distance measured from the bearing surface up the side of the head at the corners. The width across corners shall be within specified limits for the full wrenching height.
      • (b) Refer to section 4 for further information.

    ASME B18.2.1 Heavy Hex Cap Screws Length Tolerance

    Nominal Length Nominal Size (inches)
    1/4 to 3/8 7/16 and 1/2 9/16 to 3/4 7/8 and 1 1 1/8 to 1 1/2 Over 1 1/2
    Up to 25.4 mm, incl. +0.000
    0.762    		 +0.000
    0.762    		 +0.000
    0.762    		 ... ... ...
    Over 25.4 mm to 63.5 mm, incl. +0.000
    1.016    		 +0.000
    1.524    		 +0.000
    2.032    		 +0.000
    2.540    		 +0.000
    3.048    		 +0.000
    4.572
    Over 63.5 mm to 101.6 mm, incl. +0.000
    1.524    		 +0.000
    2.032    		 +0.000
    2.540    		 +0.000
    3.556    		 +0.000
    4.064    		 +0.000
    5.080
    Over 101.6 mm to 152.4 mm, incl. +0.000
    2.540    		 +0.000
    2.540    		 +0.000
    2.540    		 +0.000
    4.064    		 +0.000
    4.572    		 +0.000
    5.588
    Longer than 152.4 mm +0.000
    4.572    		 +0.000
    4.572    		 +0.000
    4.572    		 +0.000
    5.080    		 +0.000
    5.588    		 +0.000
    6.096
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