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 3208 INDUSTRIAL AND MARINE ENGINES
DISASSEMBLY AND ASSEMBLY
GENERAL TIGHTENING TORQUE FOR
BOLTS, NUTS AND TAPERLOCK STUDS
The following charts give the standard torque values for bolts, nuts
and taperlock studs of SAE Grade 5 or better quality. Exceptions are
given in the component Disassembly and Assembly.
THREAD DIAMETER
STANDARD TORQUE
inches
millimeter
lb. ft.
mkg
Standard thread
Use these torques for bolts and nuts with standard
threads.
1/4
6.35
9 3
1.24 0.4
5/16
7.94
18 5
2.5 0.7
318
9.53
32 5
4.4 0.7
7/16
11.11
50 10
6.9 1.4
1/2
12.70
75 10
10.4 1.4
9/16
14.29
11015
15 2.0
5/8
15.88
150 20
20.7 2.8
3/4
19.05
265 35
36.6 4.8
7/8
22.23
420 60
58.1 8.3
1
25.40
640 80
88.5 11.1
1 1/8
28.58
800 100
110.6 + 13.8
1 1/4
31.75
1000 120
138 16.6
1 3/8
34.93
1200 150
166 + 20.7
1 1/2
38.10
1500 200
207 27.7
Use these torques for bolts and nuts on hydraulic
valve bodies.
5/16
7.94
13 2
1.8 0.3
3/8
9.53
24 2
3.3 0.3
7/16
11.11
39 2
5.4 0.3
1/2
12.70
60 3
8.3 0.4
5/8
15.88
118 4
16.3 0.5
Taperlock stud
Use these torques for studs with Taperlock threads .
1/4
6.35
5 2
0.69 0.3
5/16
7.94
10 3
1.4 0.4
318
9.53
20 3
2.8 0.4
7/16
11.11
30 5
4.1 0.7
1/2
12.70
40 5
5.5 0.7
9/16
14.29
60 10
8.3 1.4
5/8
15.88
75 10
10.4 1.4
3/4
19.05
110 15
15.2 2.0
7/8
22.23
170 20
23.5 2.8
1
25.40
260 30
35.9 4.1
1 1/8
28.58
320 30
44.2 4.1
1 1/4
31.75
400 40
55 5.5
1 3/8
34.93
480 40
66 5.5
1 1/2
38.10
550 50
76 7
3
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