SAE
Grade
and Head
Markings
SAE
Grade
and Nut
Markings
Grade 1
a
Lubricated
SIZE
lb-ft
10-24
1/4
2.8
5/16
5.5
3/8
10
7/16
16
1/2
25
9/16
36
5/8
50
SIZE
lb-ft
M6
7
M8
17
DO NOT use these values if a different torque value or tightening procedure is given for a specific application.
Fasteners should be replaced with the same or higher grade. If higher grade fasteners are used, these should only be
tightened to the strength of the original.
a
"Lubricated" means coated with a lubricant such as engine oil, or fasteners with phosphate and oil coatings.
b
"Dry" means plain or zinc plated without any lubrication
* Values with asterisk are in lb-in.
TORQUE SPECIFICATIONS
1 or 2
No Marks
2
No Marks
Grade 2
b
a
Dry
Lubricated
lb-ft
lb-ft
21*
3.5
4.5
7
9
13
16
20
26
31
39
45
56
62
78
5
5.1
5
Grade 5, 5.1 or 5.2
b
a
Dry
Lubricated
lb-ft
lb-ft
27*
32*
5.5
7
11
15
20
26
32
41
50
63
70
90
100
125
Metric Grade 8.8
SIZE
lb-ft
M12
60
M14
95
8
5.2
8
Grade 8 or 8.2
b
a
Dry
Lubricated
lb-ft
lb-ft
43*
45*
9
10
18
21
33
36
52
58
80
90
115
130
160
160
8.2
b
Dry
lb-ft
60*
12.5
26
46
75
115
160
225
16