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 – 20 UNC
5/16 – 18 UNC
3/8 – 16 UNC
85 + 15 in–lb
110 + 20 in–lb
200 + 100 in–lb
*
Hole size, material strength, material thickness & 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
Product Records and Maintenance
Page 2 – 6
Topdresser 1800 & 2500
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