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TM 10-4320-342-24
APPENDIX H
TORQUE LIMITS - continued
MINIMUM
TYPE
TENSILE
MATERIAL
BODY SIZE OR OUTSIDE DIAMETER OF FASTENER
STRENGTH
#2
#3
#4
#5
#6
#8
#10
1/4
1/10
1/8
1/16
1/2
5/16
MACHINE
COPPER
2
3.3
4.4
6.4
8
16
20
65
110
17
27
37
49
SCREW
60,000
(CU) 63%
(.2)
(.3)
(.5)
(.7)
(.9)
(1.8)
(2.3)
(7.3)
(12.4)
(23)
(37)
(50)
(66)
YELLOW
PSI
ZINC
BRASS
(ZN) 37%
COPPER
SILOCONE
70,000
(CU) 96%
2.3
3.7
4.9
7.2
10
19
22
BRONZE
PSI
ZINC
(.2)
(.3)
(.5)
(.8)
(1.1)
(2.1)
(2,5)
70
125
20
30
41
53
TYPE "B"
(ZN) 2%
(7.9)
(14.1)
(27)
(41)
(56)
(72)
SILICON
(SI) 2%
TYPE
BODY SIZE OR OUTSIDE DIAMETER OF FASTENER
3/8
3/4
7/8
1
11/8
11/4
13/8
11/2
15/8
13/4
17/8
2
21/
4
21/
2
23/
4
3
MACHINE
SCREW
78
104
160
215
325
400
595
YELLOW
(106)
(141)
(217)
(292)
(441)
(542)
(807)
BRASS
SILICONE
88
117
180
250
365
450
655
BRONZE
(119)
(159)
(244)
(339)
(495)
(610)
(888)
TYPE "B"
LEGEND
1.
TORQUE VALUES: All numbers are in foot-pounds except those that are underlined, which are inch-pounds.
2.
Numbers in parentheses are Newton-Meters.
H-4
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