Other Torque Specifications
SAE Grade 8 Steel Set Screws
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 ± 3 ft-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 ± 5 in-lb
No. 8 - 32 UNC
30 ± 5 in-lb
No. 10 - 24 UNC
38 ± 7 in-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)
Threads per Inch
Thread Size
Type A
Type B
Baseline Torque**
No. 6
18
20
20 ± 5 in-lb
No. 8
15
18
30 ± 5 in-lb
No. 10
12
16
38 ± 7 in-lb
No. 12
11
14
85 ± 15 in-lb
**The hole size, material strength, material thickness, and material finish must be
considered when determining the specified torque values. All the torque values
are based on the 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
Greensmaster
®
eFlex 1800, 2100 and 2120
Page 2–11
Specifications and Maintenance: Torque Specifications
12189SL Rev E
