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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