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Torque Values

SAE 
Grade
Markings
Tensile 
PSI
Material
 5/16   3/8   7/16   1/2   9/16   5/8   3/4   7/8 
Brass
Brass Bolt
60,000
Copper 63% 
Zinc 37%
17
27
37
49
78
104
160
Stainless
Stainless Steel Bolt
72,000
AISI  303
10
18
28
40
54
80
117
180
2
Grade 2 Bolt
74,000
Low 
Carbon
12
20
32
47
69
96
155
206
3
Grade 3 Bolt 100,000
Medium 
Carbon
17
30
47
69
103
145
234
372
5
Grade 5 Bolt 120,000
Medium 
Carbon Heat 
Treated
19
33
54
78
114
154
257
382
6
Grade 6 Bolt 133,000
Medium 
Carbon 
Tempered
24
43
69
106
150
209
350
550
7
Grade 7 Bolt 133,000
Medium 
Carbon 
Alloy
25
44
71
110
154
215
360
570
8
Grade 8 Bolt 150,000
Medium 
Carbon 
Alloy
29
47
78
119
169
230
380
600
10
Grade 10 Bolt 160,000
High 
Carbon 
Case Hardened
33
54
84
125
180
250
400
640

Safety Notes
These values are given in lb-ft and apply to clean smooth lubricated threads on NEW fasteners. The nut and washer must have equal or greater rating then the bolt.

  • Consult your manual for material type
  • The values are for the fastener not the assembly. 
  • Some assembles can not with stand the maximum clamping force.
  • The values for fine treads are slightly higher.

    Compiled By Chris Klossner


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