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Inch screws
Screw
diameter
Inch
mm
1/4
6.4
5/16
7.9
3/8
9.5
7/16
11.1
1/2
12.7
9/16
14.3
5/8
15.9
3/4
19.1
7/8
22.2
1
25.4
1 1/8
28.6
1 1/4
31.8
1 3/8
34.9
1 1/2
38.1
Tightening torques - inch screws in Nm
Strength 2
No marks on head
Coarse
Fine thread
thread
5.6
6.3
10.8
12.2
20.3
23.0
33.9
36.6
47.5
54.2
67.8
81.3
95.0
108.5
169.5
189.8
176.3
196.6
257.6
278.0
359.3
406.8
508.5
562.7
664.4
759.3
881.3
989.8
Strength 5
3 marks on head
Coarse
Fine thread
thread
8.6
9.8
17.6
19.0
31.2
35.2
50.2
55.6
77.3
86.8
108.5
122.0
149.1
169.5
271.1
298.3
433.9
474.5
650.8
718.6
813.5
908.4
1139
1261
1491
1695
1966
2237
Strength 8
6 marks on head
Coarse
Fine thread
thread
12.2
13.5
24.4
27.1
44.7
50.2
70.5
78.6
108.5
122.0
156.0
176.3
216.0
244.0
380.0
427.0
610.0
678.0
915.2
1017
1302
1458
1844
2034
2414
2753
3128
3620
57
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