Other Torque Specifications
SAE Grade 8 Steel Set Screws
Wheel Bolts and Lug Nuts
Recommended Torque
Thread Size
Thread Size
Recommended Torque**
65 + 10 ft--lb 88 + 14 N--m
Square Head
140 + 20 in--lb
215 + 35 in--lb
35 + 10 ft--lb
75 + 15 ft--lb
Hex Socket
73 + 12 in--lb
145 + 20 in--lb
18 + 3 ft--lb
7/16 -- 20 UNF
Grade 5
1/4
5/16
3/8
-- 20 UNC
-- 18 UNC
-- 16 UNC
-- 13 UNC
1/2
-- 20 UNF
80 + 10 ft--lb 108 + 14 N--m
80 + 10 ft--lb 108 + 14 N--m
80 + 10 ft--lb 108 + 14 N--m
Grade 5
M12 X 1.25
Class 8.8
1/2
50 + 10 ft--lb
M12 X 1.5
Class 8.8
**
For steel wheels and non--lubricated fasteners.
Thread Cutting Screws
(Zinc Plated Steel)
Thread Cutting Screws
(Zinc Plated Steel)
Type 1, Type 23 or Type F
Thread
Size
Threads per Inch
Type A Type B
Baseline Torque*
Thread Size
Baseline Torque*
No. 6 -- 32 UNC
No. 8 -- 32 UNC
No. 10 -- 24 UNC
20 + 5 in--lb
30 + 5 in--lb
No. 6
No. 8
18
15
12
11
20
18
16
14
20 + 5 in--lb
30 + 5 in--lb
38 + 7 in--lb
85 + 15 in--lb
38 + 7 in--lb
No. 10
No. 12
1/4
5/16
3/8
-- 20 UNC
-- 18 UNC
-- 16 UNC
85 + 15 in--lb
110 + 20 in--lb
200 + 100 in--lb
*Holesize,materialstrength,materialthickness &finish
must be considered when determining specific torque
values. All torque values are based on non--lubricated
fasteners.
Conversion Factors
in--lb X 11.2985 = N--cm
N--cm X 0.08851 = in--lb
ft--lb X 1.3558 = N--m
N--m X 0.7376 = ft--lb
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