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