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Proof Load Tensile Strength for Grade 2, 5, & 8

Nominal Dia of Products and Threads per in.
Stress Area. sq. in
Grade 2
Grade 5
Grade 8
Proof Load, lb.
Tensile Strength Min, lb.
Proof Load, lb.
Tensile Strength Min, lb.
Proof Load, lb.
Tensile Strength Min, lb.
COARSE Thread Series - UNRC
1/4 - 20
0.0318
1750
2350
2700
3800
3800
4750
5/16 - 18
0.0524
2900
3900
4450
6300
6300
7850
3/8 - 16
0.0775
4250
5750
6600
9300
9300
11600
7/16 - 14
0.1063
5850
7850
9050
12800
12800
15900
1/2 - 13
0.1419
7800
10500
12100
17000
17000
21300
9/16 - 12
0.1820
10000
13500
15500
21800
21800
27300
5/8 - 11
0.2260
12400
16700
19200
27100
27100
33900
3/4 - 10
0.3340
18400
24700
28400
40100
40100
50100
7/8 - 9
0.4620
15200
27700
39300
55400
55400
69300
1-8
0.6060
20000
36400
51500
72700
72700
90900
1 1/8
0.7630
25200
45800
56500
80100
91600
114400
1 1/4-7
0.9690
32000
58100
71700
101700
116300
145400
1 3/8-6
1.1550
38100
69300
85500
121300
138600
173200
1 1/2-6
1.4050
46400
84300
104000
147500
168600
210800
FINE Thread Series - UNRC
1/4 - 28
0.0364
2000
2700
3100
4350
4350
5450
5/16 - 24
0.0580
3200
4300
4900
6950
6950
8700
3/8 - 24
0.0878
4800
6500
7450
10500
10500
13200
7/16 - 20
0.1187
6550
8800
10100
14200
14200
17800
1/2 - 20
0.1599
8800
11800
13600
19200
19200
24000
9/16 - 18
0.2030
11200
15000
17300
24400
24400
30400
5/8 - 18
0.2560
14100
18900
21800
30700
30700
38400
3/4 - 16
0.3730
20500
27600
31700
44800
44800
56000
7/8 - 14
0.5090
16800
30500
43300
61100
61100
76400
1-12
0.6630
21900
39800
56400
79600
79600
99400
1-14 uns
0.6790
22400
40700
57700
81500
81500
101900
1 1/8-12
0.8560
28200
51400
63300
89900
102700
128400
1 1/4-12
1.0730
35400
64400
79400
112700
128800
161000
1 3/8-12
1.3150
43400
78900
97300
138100
157800
197200
1 1/2-12
1.5810
52200
94900
117000
166000
189700
237200
Proof Loads and tensile strengths are computed by multiplying the proof load stresses and tensile strengths stresses by the stress area of the thread.
As = 0.7854 [D-0.9743/n] squared
where D equals nominal diameter in in. and n equals thread per inch.
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