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Square Head Bolts

ASME B 18.2.1 - 2010

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美标ASME B18.2.1 - 2010 ASME18.2.1 18.2.1A Square Head Bolts

 *Models with different eras.

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

Suppliers

Best price if from GlobalFastener.com.
NingBo ZhenHai Guisi Zhaoyang Hardware Screw Factory
  • Mr.Fang

  • +86-13806639241

  • +86-574-86574666

  • Material: carbon steel; Specifications: M5-M24; Length: 20mm~250mm;Surface treatment: nature, black, galvanized, rohs, hot galvanized, dacromet; Grade: 4.8~12.9

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