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ASME B18.2.1 Askew Head Bolts
Dimensions of Askew Head Bolts
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Thread Length for Body Bolt Lengths, Lr [Note (4)] |
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Nominal Size or Basic Product Diameter [Note (2)] |
Body Diameter, E (See Para. 3.5) |
Width Across Flats, F (See Para. 2.1.2) |
Width Across Corners, G |
Head Height, H[Note (3)] |
Midheight, H Note (3)] |
Radius of Fillet, R |
Maximum Unthreaded Leng th, S [Note (4)] |
6 in. and Shorter |
Over 6 in. |
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Max. |
Min. |
Basic |
Max. |
Min. |
Max. |
Min. |
Max. |
Min. |
Ref. |
Max. |
Min. |
Nom. |
Nom. |
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3/8 |
0.375 |
0.388 |
0.36 |
9/16 |
0.562 |
0.544 |
0.795 |
0.747 |
0.317 |
0.277 |
0.25 |
0.03 |
0.01 |
0.25 |
1 |
1.25 |
1/2 |
0.5 |
0.515 |
0.482 |
3/4 |
0.75 |
0.725 |
1.061 |
0.995 |
0.411 |
0.371 |
0.328 |
0.03 |
0.01 |
0.312 |
1.25 |
1.5 |
5/8 |
0.625 |
0.642 |
0.605 |
15/16 |
0.938 |
0.906 |
1.326 |
1.244 |
0.52 |
0.48 |
0.422 |
0.06 |
0.02 |
0.344 |
1.5 |
1.75 |
3/4 |
0.75 |
0.768 |
0.729 |
1 1/8 |
1.125 |
1.088 |
1.591 |
1.494 |
0.614 |
0.574 |
0.5 |
0.06 |
0.02 |
0.406 |
1.75 |
2 |
7/8 |
0.875 |
0.895 |
0.852 |
1 5/16 |
1.312 |
1.269 |
1.856 |
1.742 |
0.723 |
0.683 |
0.594 |
0.06 |
0.02 |
0.438 |
2 |
2.25 |
1 |
1 |
1.022 |
0.976 |
1 1/2 |
1.5 |
1.45 |
2.121 |
1.991 |
0.801 |
0.761 |
0.656 |
0.09 |
0.03 |
0.5 |
2.25 |
2.5 |
NOTES:
(1) Bearing Surface. A die seam across the bearing sur face is perm issi bl e . Angle of bearing sur face with respect to shank is based on the
2 in. 12 slope of the inner flange of American Standard beams and channels.
(2) Thread Series. Askew head bolts are only available with unified course (UNC) threads.
(3) Head Height. Midheight, H , is a reference dimension and equals the basic head height of square bolts as given in Table 2. Head
height, H 1 , is computed as midheight, H , + 0.0833 times the specified maximum width across flats, F. Tolerance on head height, H 1,is
±0.020 in. from computed head height.
(4) Thread Length. All askew head bolts of nominal leng ths equal to or shor ter than the nominal thread leng th, LT, plus the unthreaded
leng th, S , shall be threaded for full leng th. The distance from the bearing sur face of the head, as measured at midheight of head to
the last scratch of thread, shall not exceed the unthreaded leng th, S . The distance from the bearing sur face of the head, as measured
at midheight, to the first complete (full form) thread, as measured with a nonchamfered GO thread ring gage assembled by hand as far
as the thread will permit, shall not exceed the unthreaded leng th, S , plus a leng th of 2 1⁄2 threads.
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