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Square Head Bolts

ASME B 18.2.1 - 2010

Display drawing:

Screw Thread 5/16 3/8 7/16 1/2 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 1/4
D 0.3125 0.375 0.4375 0.5 0.625 0.75 0.875 1 1.125 1.25 1.375 1.5 0.25
PP UNC 18 16 14 13 11 10 9 8 7 7 6 6 20
Ds Max 0.324 0.388 0.452 0.515 0.642 0.768 0.895 1.022 1.149 1.277 1.404 1.531 0.260
Ds Min 0.298 0.36 0.421 0.482 0.605 0.729 0.852 0.976 1.098 1.223 1.345 1.47 0.237
S Basic 1/2 9/16 5/8 3/4 15/16 1-1/8 1-5/16 1-1/2 1-11/16 1-7/8 2-1/16 2-1/4 3/8
S Max 0.500 0.562 0.625 0.750 0.938 1.125 1.312 1.500 1.688 1.875 2.062 2.250 0.375
S Min 0.484 0.544 0.603 0.725 0.906 1.088 1.269 1.450 1.631 1.812 1.944 2.175 0.362
E Max 0.707 0.795 0.884 1.061 1.326 1.591 1.856 2.121 2.386 2.652 2.917 3.182 0.53
E Min 0.665 0.747 0.828 0.995 1.244 1.494 1.742 1.991 2.239 2.489 2.738 2.986 0.498
K Basic 13/64 1/4 19/64 21/64 27/64 1/2 19/32 21/32 3/4 27/32 29/32 1 11/64
K Max 0.220 0.268 0.316 0.348 0.444 0.524 0.620 0.684 0.780 0.876 0.940 1.036 0.188
K Min 0.186 0.232 0.278 0.308 0.400 0.476 0.568 0.628 0.720 0.812 0.872 0.964 0.156
R Max 0.03 0.03 0.03 0.03 0.06 0.06 0.06 0.09 0.09 0.09 0.09 0.09 0.03
R Min 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.03 0.03 0.03 0.03 0.01
B L≤6 0.875 1.000 1.125 1.250 1.500 1.750 2.000 2.250 2.500 2.750 3.000 3.250 0.750
B L＞6 1.125 1.250 1.375 1.500 1.750 2.000 2.250 2.500 2.750 3.000 3.250 3.500 1.000