TM 9-2330-388-14
F-1.
Torque Limits
APPENDIX F
TORQUE LIMITS
Table F-1. Standard Torque Specifications,
USAGE
MUCH USED
MUCH USED
USED AT TIMES
USED AT TIMES
To 1/2-69.000
To 314-120,000
To 5/8-140,000
150,000
(4850.7000)
(8436.0000)
(9842.0000)
(10545.0000)
CAPSCREW DIAMETER AND
MINIMUM TENSILE STRENGTH
To 3/4-64,000
To 1-115,000
To 3/4-133,000
PSI (KG/SO CM)
(4499.2000)
(8084.5000)
(9349.9000)
To 1-55,000
(3816.5000)
QUALITY OF
MINIMUM
MEDIUM
BEST
MATERIAL
INDETERMINATE
COMMERCIAL
COMMERCIAL
COMMERCIAL
SAE GRADE NUMBER
1 or 2
5
6 or 7
8
CAPSCREW HEAD MARKINGS
Manufacturer's marks may vary.
These are all SAE Grade 5 (3-line).
CAPSCREW BODY SIZE
TORQUE
TORQUE
TORQUE
TORQUE
(INCHES)- (THREAD)
FT-LB (N-M)
FT-LB (N.M)
FT-LB (N.M)
FT-LB (N.M)
1/4-20
5
(7)
8
(11)
10
(14)
12
(16)
-28
6
(8)
10
(14)
14
(19)
5/16-18
11
(15)
17
(23)
19
(26)
24
(33)
-24
13
(18)
19
(26)
27
(37)
3/8-16
18
(24)
31
(42)
34
(46)
44
(60)
-24
20
(27)
35
(47)
49
(66)
7/16-14
28
(38)
49
(66)
55
(75)
70
(95)
-20
30
(41)
55
(75)
78
(106)
1/2-13
39
(53)
75
(102)
85
(115)
105
(142)
-20
41
(56)
85
(115)
120
(163)
9/16-12
51
(69)
110
(149)
120
(163)
155
(210)
-18
55
(75)
120
(163)
170
(231)
5/8-11
83
(113)
150
(203)
167
(226)
210
(285)
-18
95
(129)
170
(231)
240
(325)
3/4-10
105
(142)
270
(366)
280
(380)
375
(509)
-16
115
(156)
295
(400)
420
(570)
7/8-9
160
(217)
395
(536)
440
(597)
605
(820)
-14
175
(237)
435
(590)
675
(915)
1-8
235
(319)
590
(800)
660
(895)
910
(1234)
-14
250
(339)
660
(895)
990
(1342)
CAUTION: Capscrews threaded Into aluminum may require reductions In torque of 30% or more, unless
inserts are used.
NOTE: Do not use above values In place of those specified in the engine groups of this manual; special
attention should be observed served in case of SAE Grade 6,.7, and 8 capscrews.
1.
Always use the torque values listed above when specific specifications are not available.
2.
The above is based on use of clean and dry threads.
3.
Reduce torque by 10% when engine oil is used as a lubricant.
4.
Reduce torque by 20% if new plated capscrews are used.
F-1/(F-2 Blank)
