78
12916 Parts & Specifications Manual #99905833
Thread Torque Chart (English)
FINE THREAD BOLTS (ENGLISH)
COARSE THREAD BOLTS (ENGLISH)
SIZE
BOLT
DIA.
GRADE 5
GRADE 8
SIZE
BOLT
DIA.
GRADE 5
GRADE 8
(DIA-TPI) (INCHES) PLAIN
PLATED PLAIN PLATED (DIA-TPI) (INCHES) PLAIN PLATED PLAIN PLATED
(FT-LB) (FT-LB) (FT-LB) (FT-LB)
(FT-LB) (FT-LB) (FT-LB) (FT-LB)
5/16-24
0.3125
19
14
27
20
5/16-18
0.3125
17
13
25
18
3/8-24
0.375
35
26
49
35
3/8-16
0.375
31
23
44
33
7/16-20
0.4375
55
41
78
58
7/16-14
0.4375
49
37
70
52
1/2-20
0.5
90
64
120
90
1/2-13
0.5
75
57
105
80
9/16-18
0.5625
120
90
170
130
9/16-12
0.5625
110
82
155
115
5/8-18
0.625
170
130
240
180
5/8-11
0.625
150
115
220
160
3/4-16
0.75
300
225
420
315
3/4-10
0.75
265
200
375
280
7/8-11
0.875
445
325
670
500
7/8-9
0.875
395
295
605
455
1-12
1
645
485
995
745
1-8
1
590
445
910
680
1 1/8-12
1.125
890
670
1445
1085
1 1/8-7
1.125
795
595
1290
965
1 1/4-12
1.25
1240
930
2010
1510
1 1/4-7
1.25
1120
840
1815
1360
1 3/8-12
1.375
1675
1255
2710
2035
1 3/8-6
1.375
1470
1100
2380
1780
1 1/2-12
1.5
2195
1645
3560
2670
1 1/2-6
1.5
1950
1460
3160
2370
NOTES
1
Tightening torques provided are midrange.
2
Consult bolt manufacturer’s particular specifications, when provided.
3
Use flat washers of equal strength.
4
All torque measurements are given in foot-pounds.
5
Torque values specified are for bolts with residual oils or no special lubricants applied. If special lubricants of high
stress ability, such as Never-Seez compound graphite and oil, molybdenum disulphide, colloidal copper or white
lead are applied, multiply the torque values in the charts by the factor .90. The use of Loctite does not affect the
torque values listed above.
SAE J429
GRADE 5
SAE J429
GRADE 8
SAE J429
GRADE 5
SAE J429
GRADE 8
WARNING
Anytime a gear-bearing bolt is removed, it
must be replaced with a new bolt of the
identical grade and size. Once a bolt has
been torqued to 75% of its proof load and
then removed, the torque coefficient may no
longer be the same as when the bolt was new
thus giving indeterminate clamp loads after
torqueing. Failure to replace gear-bearing
bolts may result in bolt failure due to metal
fatigue causing death or serious injury.
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