Bolt Grade Strength


Bolt Grade / Tensile Strength
(Not Shear Strength)
Grade Dia(in) Coarse(lbs) Fine(lbs)
2 1/4
5/16
7/16
1/2
9/16
5/8
3/4
2350
3900
7850
10500
13500
16700
24700
2700
4300
8800
11800
15000
18900
27600
5 1/4
5/16
7/16
1/2
9/16
5/8
3/4
3800
6300
12800
17000
21800
27100
40100
4350
6950
14400
19200
24400
30700
44800
8 1/4
5/16
7/16
1/2
9/16
5/8
3/4
4750
7850
15900
21300
27300
33900
50100
5450
8700
17800
24000
30400
38400
56000

Nominal Assembly Torque (ft-lbs)
Dia.(in.) Grade 2 Grade 5 Grade 8 Grade 9
1/4C
1/4F
5/16C
5/16F
7/16C
7/16F
1/2C
1/2F
9/16C
9/16F
5/8C
5/8F
3/4C
3/4F
5.5
6.3
11
12
32
36
50
55
70
80
100
110
175
200
8
10
17
19
50
55
75
85
110
120
150
170
260
300
12
14
24
27
70
80
110
120
150
170
210
240
380
420
11
13
21
23
60
65
95
105
140
150
185
205
290
355

Info compiled by: Gil Meacham
Graciously provided by Joe Schaeffer