TM 9-6115-604-34
NAVFAC P-633-34
Table 1-2. Capscrew Markings and Torque Values (Continued)
NOTE
1.
Use the torque values listed above when specific torque values are not available.
2.
Do not use above values in place of those specified in other sections of this manual.
3.
The above is based on use of clean, dry threads.
4.
Reduce torque by 10 percent when engine oil is used as a lubricant.
5.
Reduce torque by 20 percent if new plated capscrews are used.
6.
Capscrews threaded into aluminum may require reductions in torque of 30 percent or more of Grade 5
capscrews torque and must attain two capscrew diameters of thread engagement.
Table 1-3. Prevailing Torque of Locknuts and Lockscrews
SIZE
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
Nuts, and all
pounds-inches
4.0
5.0
12
15
20
27
34
51
metal bolts
newton-meters
0.45
0.56
1.4
1.7
2.3
3.1
4.0
5.8
Nylon insert
pounds-inches
4.0
5.0
9.0
12
15
22
28
43
Adhesive, or nylon
newton-meters
0.45
0.46
1.0
1.4
1.7
2.5
3.2
4.9
coated bolts
NOTE
1.
Clean dirt and other foreign material off of bolt and nut.
2.
Discard bolts or nuts that show thread damage or signs of overtightening.
3.
Assemble the nut and bolt so that the self-locking insert has fully engaged the threads.
4.
Using a pound-inch torque wrench, check the torque required to turn the nut or bolt.
5.
Replace bolts or nuts that do not have the minimum torque given in the chart, above.
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