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    2. B18.2.1 Square Bolts Dimensions

    B18.2.1 Square Bolts Dimensions

    Traditional square head bolts used in structural and heavy-duty applications

    B18.2.1 Square Bolts Dimension Standard include head size and threading specifications used in structural steel and industrial assemblies.

    ASME B18.2.1 Square Bolts

    ASME B18.2.1 Square Bolts Dimensions

    Nominal Size or Basic Product Diameter Full-Size Body Diameter, E Width Across Flats, F Width Across Corners, G Head Height, H Radius of Fillet, R Nominal Thread Length, LT
    Max. Min. Basic Max. Min. Max. Min. Basic Max. Min. Max. Min. 152.4mm and Shorter Over 152.4mm
    1/4 6.350 6.604 6.020 9.525 9.525 9.195 13.462 12.649 4.366 4.775 3.962 0.762 0.254 19.050 25.400
    5/16 7.938 8.230 7.569 12.700 12.700 12.294 17.958 16.891 5.159 5.588 4.724 0.762 0.254 22.225 28.575
    3/8 9.525 9.855 9.144 14.288 14.275 13.818 20.193 18.974 6.350 6.807 5.893 0.762 0.254 25.400 31.750
    7/16 11.113 11.481 10.693 15.875 15.875 15.316 22.454 21.031 7.541 8.026 7.061 0.762 0.254 28.575 34.925
    1/2 12.700 13.081 12.243 19.050 19.050 18.415 26.949 25.273 8.334 8.839 7.823 0.762 0.254 31.750 38.100
    5/8 15.875 16.307 15.367 23.813 23.825 23.012 33.680 31.598 10.716 11.278 10.160 1.524 0.508 38.100 44.450
    3/4 19.050 19.507 18.517 28.575 28.575 27.635 40.411 37.948 12.700 13.310 12.090 1.524 0.508 44.450 50.800
    7/8 22.225 22.733 21.641 33.338 33.325 32.233 47.142 44.247 15.081 15.748 14.427 1.524 0.508 50.800 57.150
    1 25.400 25.959 24.790 38.100 38.100 36.830 53.873 50.571 16.669 17.374 15.951 2.286 0.762 57.150 63.500
    1 1/8 28.575 29.185 27.889 42.863 42.875 41.427 60.604 56.871 19.050 19.812 18.288 2.286 0.762 63.500 69.850
    1 1/4 31.750 32.436 31.064 47.625 47.625 46.025 67.361 63.221 21.431 22.250 20.625 2.286 0.762 69.850 76.200
    1 3/8 34.925 35.662 34.163 52.388 52.375 50.648 74.092 69.545 23.019 23.876 22.149 2.286 0.762 76.200 82.550
    1 1/2 38.100 38.887 37.338 57.150 57.150 55.245 80.823 75.844 25.400 26.314 24.486 2.286 0.762 82.550 88.900

    ASME B18.2.1 Square Bolts 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. +0.508
    0.762    		 +0.508
    0.762    		 +0.508
    0.762    		 ... ... ...
    Over 25.4 mm to 63.5 mm, incl. +0.508
    1.016    		 +1.016
    1.524    		 +1.524
    2.032    		 +2.032
    2.54    		 +3.048
    3.048    		 +4.572
    4.572
    Over 63.5 mm to 101.6 mm, incl. +1.016
    1.524    		 +1.524
    2.032    		 +2.032
    2.54    		 +2.54
    3.556    		 +4.064
    4.064    		 +5.08
    5.08
    Over 101.6 mm to 152.4 mm, incl. +1.524
    2.54    		 +2.032
    2.54    		 +2.54
    2.54    		 +3.048
    4.064    		 +4.572
    4.572    		 +5.588
    5.588
    Longer than 152.4 mm +2.54
    4.572    		 +3.048
    4.572    		 +3.556
    4.572    		 +4.064
    5.08    		 +5.588
    5.588    		 +6.096
    6.096
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