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Tensile Stress Areas for Carbon Steel Nuts Table

Tensile Stress Areas, Carbon (#2) Steel Nuts
UNC Coarse Thread
UNF Fine Thread
Nominal Size, Threads/inch
Tensile Stress Area
Nominal Size, Threads/inch
Tensile Stress Area
1/4-20
0.032
1/4-28
0.036
5/16-18
0.052
5/16-24
0.058
3/8-16
0.078
3/8-24
0.088
7/16-14
0.106
7/16-20
0.119
1/2-13
0.142
1/2-20
0.160
9/16-12
0.182
9/16-18
0.203
5/8-11
0.226
5/8-18
0.256
3/4-10
0.334
3/4-16
0.373
7/8-9
0.462
7/8-14
0.509
1 - 8
0.606
1 - 12
0.663
1-1/8-7
0.763
1-1/8 - 12
0.856
1-1/4-7
0.969
1-1/4 - 12
1.073
1-3/8-6
1.155
1-3/8 - 12
1.315
1-1/2-6
1.405
1-1/2 - 12
1.581
1-3/4-5
1.900
2-4-1/2
2.500
2-1/4 - 4-1/2
3.250
2-1/2 - 4
4.000
2-3/4 - 4
4.930
3 - 4
5.970
3-1/4 - 4
7.100
3-1/2 - 4
8.330
3-3/4 - 4
9.660
4 - 4
11.080
Stress area = .7854 * ((X - .9743/y) * (X - .9743/y))
where x = nominal size, y = threads/inch
(standards set by American Society of Testing & Materials)

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