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TM 9-2350-287-34
C-3. HOW TO USE TORQUE TABLE (continued).
CAPSCREW HEAD MARKINGS
Manufacturer’s marks may vary.
These are all SAE Grade 5 (three- line).
5.
To find the grade of the screw that is to be installed, match the markings on the head to the correct picture
of CAPSCREW HEAD MARKINGS on the table.
6.
Look down the column under the picture found in step 5 until the torque limit in foot-pounds for the diameter
and threads per inch of the screw being installed is found.
SAE CAPSCREW HEAD
MARKINGS
S I ZE
I N .
1/4
1/4
5/16
5/1 6
3/8
3/8
7/16
7/16
1/2
1/2
9/1 6
9/16
5/8
5/8
3/4
3/4
7/8
718
1
1
1118
1114
13/8
1 1/2
THREADS
PER INCH
20
28
18
24
16
24
14
20
13
20
12
18
11
18
10
16
9
14
8
14
MM
6.35
6.35
7.94
7.94
9.53
9.53
11.11
12.70
14.29
15.88
19.05
22.23
25.40
25.58
31.75
34.93
38.10
Table C-1. Torque Limits for Dry Fasteners
SAE GRADE
No. 1 or 2
FOOT-
POUNDS
N•m
5
6
11
13
18
20
28
30
39
41
51
55
63
95
105
115
160
175
235
260
6.78
8.14
14.92
17.63
24.41
27.12
37.97
40.68
52.88
55.60
69.16
74.58
85.43
128.82
142.38
155.94
216.96
237.30
318.66
339.00
TORQUE
SAE GRADE
No. 5
FOOT-
POUNDS
N•m
8.00
10.00
17.00
19.00
31.00
35.00
49.00
55.00
75.00
85.00
110.00
120.00
150.00
170.00
270.00
295.00
305.00
435.00
590.00
660.00
800.00
880.00
1460.00
1680.00
1940.00
2200.00
10.85
13.56
23.05
25.76
42.04
47.46
66.44
74.58
101.70
115.26
149.16
162.72
203.40
230.52
366.12
400.02
535.62
589.86
800.04
894.96
1064.80
1193.30
1979.80
2278.10
2630.60
2983.20
SAE GRADE
No. 6 or 7
FOOT-
POUNDS
N•m
10
19
34
55
85
120
167
280
660
.
13.56
25.76
46.10
74.58
115.26
162.72
226.45
379.68
596.64
894.96
.
SAE GRADE
No. 8
FOOT-
POUNDS
N•m
12.00
14.00
24.00
27.00
44.00
49.00
70.00
78.00
105.00
120.00
155.00
170.00
210.00
240.00
375.00
420.00
605.00
675.00
910.00
990.00
1280.00
1440.00
1820.00
2000.00
2380.00
2720.00
3160.00
3560.00
16.27
18.98
32.52
36.61
59.66
66.44
94.92
105.77
142.38
162.78
210.18
230.52
284.76
325.44
508.50
596.52
820.38
915.30
1233.96
1342.44
1735.70
1952.80
2467.90
2712.00
2337.30
3688.30
4285.00
4827.40
440
C-2
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