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Section 300-0080
1
SM 1238 2-98
WARNING
Some fasteners are important attaching parts
which could affect the performance of vital
components and systems, and/or, could result
in major repair expense. Fasteners should be
replaced with parts of the same part number,
or with equivalent parts, if replacement
becomes necessary. Do not use replacement
parts of lesser quality or substitute design.
The torque values shown in the following
tables should be used in all cases, unless
otherwise specified elsewhere in this manual,
in order to avoid possible personal injury or
property damage.
The following torque specification tables are based on
GM Standard Materials for bolts, nuts, studs and self-
locking fasteners based on SAE bolt steel
classifications, or, prevailing torque specifications for
self-locking fasteners.
To prevent the threaded bolts and nuts used on this
equipment from being overstressed during assembly,
MISCELLANEOUS - Standard Bolt and Nut Torque Specifications
and to establish a uniform value to which these
fasteners can be safely tightened, the following torque
tables have been compiled.
The torque values listed in the tables have been
established over a period of years and cover all
conditions of assembly. The maximum torque values
for standard bolts and nuts are based on 75% of the
specified minimum proof strength of the bolt steel in
order to provide a safety factor to compensate for the
variation in the accuracy of torque wrenches, skill of
the assembler, and variance in fractional conditions.
All torque values are for lubricated threads. The
term 'lubricated' includes the application of thread
lubricants, cadmium plating or the use of hardened
washers.
To provide a quick method for determining the GM
material classification of a particular standard bolt or
nut, compare the bolt head markings to those in the
appropriate tables, then locate the maximum torque
value for that bolt size in the column under that
marking.
RECOMMENDED MAXIMUM TORQUES (IMPERIAL) ± 10%
TABLE144
Size
SAE Symbol
GM 260-M Steel
(SAE GR 2)
SAE Symbol
GM 280-M Steel
(SAE GR 5)
SAE Symbol
GM 290-M Steel
(SAE GR 7)
SAE Symbol
GM 300-M Steel
(SAE GR 8)
12 Point Cap
Screws
Nm
lbf ft
Nm
lbf ft
Nm
lbf ft
Nm
lbf ft
Nm
lbf ft
0.25 - 20
0.25 - 28
0.31 - 18
0.31 - 24
0.38 - 16
0.38 - 24
0.44 - 14
0.44 - 20
0.50 - 13
0.50 - 20
0.56 - 12
0.56 - 18
0.62 - 11
0.62 - 18
0.75 - 10
0.75 - 16
0.88 - 9
0.88 - 14
1.00 - 8
1.00 - 12
1.00 - 14
5
7
11
12
20
23
33
37
50
56
75
81
102
115
176
203
169
190
258
285
285
4
5
8
9
15
17
24
27
37
41
55
60
75
85
130
150
125
140
190
210
210
8
10
18
19
31
34
47
54
75
88
108
122
149
169
271
298
434
488
651
719
732
6
7
13
14
23
25
35
40
55
65
80
90
110
125
200
220
320
360
480
530
540
11
12
22
24
38
43
59
68
94
106
136
149
190
210
332
366
536
590
800
881
902
8
9
16
18
28
32
43
50
69
78
100
110
140
155
245
270
395
435
590
650
665
12
14
24
27
43
49
68
79
106
122
156
176
217
244
380
420
610
678
915
1 003
1 030
9
10
18
20
32
36
50
58
78
90
115
130
160
180
280
310
450
500
675
740
760
14
15
27
30
49
56
75
87
119
134
171
191
237
270
420
472
679
751
1 021
1 119
1 148
10
11
20
22
36
41
55
64
88
99
126
141
175
199
310
348
501
554
753
825
847
Summary of Contents for TA30
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