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 TM 55-1905-223-24-17
APPENDIX D
TORQUE VALUES
D-1.
Scope. SAE capscrews are graded according to the strength of the capscrew. They are marked on
the head so the correct strength and torque value are known. The tables in this appendix will list the capscrew
markings with correct torque values as well as values for pipe plugs and metric bolts.
CAUTION
When replacing capscrews, always use a capscrew of the same
measurement and strength as the capscrew being replaced.
Using incorrect capscrews can result in equipment damage.
Bolts threaded into aluminum require much less torque.
NOTE
Always use torque values listed in the tables when specific
torque values are unknown. The torque values listed in the
tables are based on the use of lubricated threads.
Table D-1. Capscrew Markings and Torque Values
Capacity
SAE Grade #5
SAE Grade #6 or #7
SAE Grade #8
Body Size
Cast Iron or Steel
Cast Iron or Steel
Cast Iron or Steel
Torque
Torque
Torque
Inches-Thread ft-lb
kgm
Nm
ft-lb
kgm
Nm
ft-lb
kgm
Nm
1/4
-20
8
1.1064
10.8465
10
1.3630
13.5582
12
1.6596
16.2698
-28
10
1.3830
13.5582
14
1.9362
18.9815
5/16
-18
17
2.3511
23.0489
19
2.6277
25.7605
24
3.3192
32.5396
-24
19
2.6277
25.7605
27
3.7341
36.6071
3/8
-16
31
4.2873
42.0304
34
4.7022
46.0978
44
6.0852
59.6560
-24
35
4.8405
47.4536
49
6.7767
66.4351
7/16
-14
49
6.7767
66.4351
55
7.6065
74.5700
70
9.6810
94.9073
-20
55
7.6065
74.5700
78
10.7874 105.7538
1/2
-13
75
10.3725
101.6863
85
11.7555
115.2445
105
14.5215 142.3609
-20
85
11.7555
115.2445
120
16.5860 162.6960
9/16
-12
110
15.2130
149.1380
120
16.5960
162.6960
155
21.4365 210.1490
-18
120
16.5960
162.6960
170
23.5110 230.4860
5/8
-11
150
20.7450
203.3700
167
23.0961
226.4186
210
29.0430 284.7180
-18
170
23.5110
230.4860
240
33.1920 325.3920
3/4
-10
270
37.3410
366.0660
280
38.7240
379.6240
375
51.8625 508.4250
-16
295
40.7985
399.9610
420
58.0860 568.4360
7/8
-9
395
54.6285
535.5410
440
60.8520
596.5520
605
83.6715 820.2590
-14
435
60.1605
589.7730
675
93.3525 915.1650
1.0
-8
590
81.5970
799.9220
660
91.2780
894.8280
910
125.8530 1233.7780
-14
660
91.2780
849.8280
990
136.9170 1342.2420
D-1
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