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Chapter 2 SERVICE DATA
2.8 Tightening Torque for Standard Bolts
Thread size
Threads
Dia. x Pitch
(M-thread)
8 x 1.25
10 x 1.25
12 x 1.25
Metric automobile
screw thread
14 × 1.5
16 x 1.5
18 x 1.5
20 x 1.5
22 x 1.5
24 × 1.5
27 × 1.5
10 x 1.5
12 x 1.75
Metric course screw
14 × 2
thread
16 × 2
18 × 2.5
20 × 2.5
22 × 2.5
24 × 3
27 × 3
Note:(a) The tightening torque listed in this table is for standard bolts and nuts.
(b) The numerical values in the table are the values when spring washers are used.
(c) The table shows the standard values with a maximum tolerance value of ±10%.
(d) Use the tightening torque in this table unless otherwise specified.
(e) Do not apply oil to threaded portions.(Dry)
2-24
Width across
flats
(mm) [in.]
7
N·m
12 [0.47]
17
14 [0.55]
33
17 [0.67]
60
22 [0.87]
97
24 [0.94]
145
27 [1.06]
210
30 [1.18]
291
32 [1.26]
385
36 [1.42]
487
41 [1.61]
738
N·m
14 [0.55]
32
17 [0.67]
57
22 [0.87]
93
24 [0.94]
139
27 [1.06]
194
30 [1.18]
272
32 [1.26]
363
36 [1.42]
468
41 [1.61]
686
Strength classification
7T
kgf·m
lbf·ft
N·m
1.7
12.3
30
3.4
24.6
60
6.1
44.1
108
9.9
71.6
176
14.8
107.1
262
21.4
154.8
378
29.7
214.8
524
39.3
284.3
694
49.7
359.5
878
75.3
544.7
1328
kgf·m
lbf·ft
N·m
3.3
23.9
58
5.8
42.0
102
9.5
68.7
167
14.2
102.7
251
19.8
143.2
350
27.7
200.4
489
37.0
267.6
653
47.7
345.0
843
70.0
506.3
1236
10.9
10
kgf·m
lbf·ft
3.1
22.4
6.1
44.1
11.0
79.6
17.9
129.5
26.7
193.1
38.5
278.5
53.4
386.2
70.8
512.1
89.5
647.4
135.5
980.1
kgf·m
lbf·ft
5.9
42.67
10.4
75.2
17.0
123.0
25.6
185.2
35.7
258.2
49.9
361.0
66.6
482.0
86.0
622.0
126.0
911.4
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