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Standard Torque for Dry, Zinc Plated, and Steel Fasteners (Metric) (Cont.)
SAE Grade 8 Steel Set Screws
Thread Size
Recommended Torque
Square Head
1/4 - 20 UNC
140 ± 20 in-lb.
5/16 - 18 UNC
215 ± 35 in-lb.
3/8 - 16 UNC
35 ± 10 ft-lb.
1/2 - 13 UNC
75 ± 15 ft-lb.
Thread Cutting Screws
(Zinc Plated Steel)
Type 1, Type 23, or Type F
Thread Size
No. 6 - 32 UNC
No. 8 - 32 UNC
No. 10 - 24 UNC
1/4 - 20 UNC
5/16 - 18 UNC
3/8 - 16 UNC
*Hole size, material strength, material thickness and
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
ft-lb. X 1.3558 = N-m
N-cm X 0.08851 = in-lb.
N-cm X 0.73776 = ft-lb.
2-12
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SPECIFICATIONS
Hex Socket
73 ± 12 in-lb.
145 ± 20 in-lb.
18 ± 3 ft-lb.
50 ± 10 ft-lb.
Baseline Torque*
20 ± 5 in-lb.
30 ± 5 in-lb.
38 ± 7 in-lb.
85 ± 15 in-lb.
110 ± 20 in-lb.
200 ± 100 in-lb.
Digital Edition - TIMECUTTER® HD Service Manual
April 2017
Wheel Bolts and Lug Nuts
Thread Size
Recommended Torque**
7/16 - 20 UNF
65 ± 10 ft-lb.
Grade 5
1/2 - 20 UNF
80 ± 10 ft-lb.
Grade 5
M12 X 1.25
80 ± 10 ft-lb.
Class 8.8
M12 X 1.5
80 ± 10 ft-lb.
Class 8.8
**For steel wheels and non-lubricated fasteners.
Thread Cutting Screws
(Zinc Plated Steel)
Threads Size
Threads per Inch
Type A
No. 6
18
No. 8
15
No. 10
12
No. 12
11
*Hole size, material strength, material thickness and
finish must be considered when determining specific
torque values. All torque values are based on non-
lubricated fasteners.
88 ± 14 N-m
108 ± 14 N-m
108 ± 14 Nm
108 ± 14 Nm
Baseline
Torque*
Type B
20
20 ± 5 in-lb.
18
30 ± 5 in-lb.
16
38 ± 7 in-lb.
14
85 ± 15 in-lb.
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