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TORQUE SPECIFICATIONS FOR
STANDARD MACHINE HARDWARE
TOLERANCE ±20%
SIZE
SAE GRADE #2
o
SAE GRADE #5
0
SAE GRADE #8
0
ln./Lbs.
ln./Lbs.
ln./Lbs.
Ft./Lbs.
Nm.
Ft./Lbs.
Nm.
Ft./Lbs.
Nm.
8-32
19
2.1
30
3.4
41
4.6
8-36
20
2.3
31
3.5
43
4.9
10-24
27
3.1
43
4.9
60
6.8
10-32
31
3.5
49
5.5
68
7.7
1/4-20
66
7.6
8
10.9
12
16.3
1/4-28
76
8.6
10
13.6
14
19.
5/16-18
11
15.
17
23.1
25
34.
5/16-24
12
16.3
19
25.8
25
34.
3/8-16
20
27.2
30
40.8
45
61.2
3/8-24
23
31.3
35
47.6
50
68.
7/16-14
30
40.8
50
68.
70
95.2
7/16-20
35
47.6
55
74.8
80
108.8
1/2-13
50
68.
75
102.
110
149.6
1/2-20
55
74.8
90
122.4
120
163.2
9/16-12
65
88.4
110
149.6
150
204.
9/16-18
75
102.
120
163.2
170
231.2
5/8-11
90
122.4
150
204.
220
299.2
5/8-18
100
136.
180
244.8
240
326.4
3/4-10
160
217.6
260
353.6
386
525.
3/4-16
180
244.8
300
408.
420
571.2
7/8-9
140
190.4
400
544.
600
816.
7/8-14
155
210.8
440
598.4
660
897.6
1-8
220
299.2
580
788.8
900
1,224.
1-12
240
326.4
640
870.4
1,000
1,360.
NOTE:
1. These torque values are to be used for all hardware ex¬
cluding: lock nuts, self-tapping screws, thread forming
screws, sheet metal screws and socket head setscrews.
2. Recommended seating torque values for lock nuts:
a. For prevailing torque lock nuts—use 65% of grade 5
torques.
b. For flange whizlock nuts (and screws)—use 135% of
grade 5 torques.
3. Unless otherwise noted on assembly drawings all torque
values must meet this specification.
BOLT HEAD MARKING
S.A.E. GRADE:
2 o
5 0
8 ©
18
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