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TM 10-3930-643-20
APPENDIX E
TORQUE LIMITS
E-1.
General Information.
This appendix provides general torque limits for
fasteners.
Special torque values are indicated in the maintenance procedures
for applicable components.
The general torque values given in this appendix
shall be used when specific torque values are not indicated in the maintenance
procedures. When applying torque in tightening direction, check torque when
the fastener just begins to turn.
Conformance is best determined by checking
immediately after assembly.
E-2.
Torque Limits.
a.
Table E-1.
Torque Limits for Standard Fasteners. This table provides
tightening torque for general purpose applications using Grade 8, coarse thread
bolts and nuts, through hardened flat washers
(Rockwell
“ C ” 3 8 - 4 5 ) , a l l
phosphate coated, and assembled without supplemental lubrication.
The torques
shown also apply to the following:
1.
Phosphate coated bolts used in tapped holes in steel or gray iron.
2.
Phosphate coated bolts used with phoshate coated prevailing torque
nuts (nuts with distorted threads or plastic inserts).
3.
Phosphate coated bolts used with copper plated weld nuts.
STANDARD TORQUE
NOMINAL
PLUS OR MINUS 10%
THREAD
FOOT
NEWTON
DIAMETER
POUNDS
METERS
1/4
7
10
5/16
14
19
3
/8
24
32
7/16
38
51
1/2
60
80
9/16
80
110
5
/8
115
155
3
/4
200
270
7
/8
320
440
1
480
650
1 - 1 /8
590
800
1 - 1 /4
830
1100
1 - 3 /8
1100
1500
1-1/2
1400
1900
1-3/4
2300
3100
2
3400
4600
E-1
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