General Information: 0A-5
Standard Tightening Torque
Each fastener should be tightened to the torque specified in each section of this manual. If no description or
specification is provided, refer to the following tightening torque chart for the applicable torque for each fastener. When
a fastener of greater strength than the original one is used, however, use the torque specified for the original fastener.
NOTE
• For the flanged bolt, flanged nut and self-lock nut of 4T and 7T strength, add 10% to the tightening
torque given in the following chart.
• The following chart is applicable only where the fastened parts are made of steel light alloy.
Tightening torque chart
Strength Unit
Thread Diameter (Nominal Diameter) (mm)
4 5 6 8 10 12 14 16 18
A equivalent of 4T strength fastener
N⋅m
kgf-m
lb-ft
1.5
0.15
1.0
3.0
0.30
2.5
5.5
0.55
4.0
13
1.3
9.5
29
2.9
21.0
45
4.5
32.5
65
6.5
47.0
105
10.5
76.0
160
16.0
116.0
A equivalent of 6.8 strength
fastener without flange
N⋅m
kgf-m
lb-ft
2.4
0.24
2.0
4.7
0.47
3.5
8.4
0.84
6.0
20
2.0
14.5
42
4.2
30.5
80
8.0
58.0
125
12.5
90.5
193
19.3
139.5
280
28.0
202.5
A equivalent of 6.8 strength
fastener with flange
*: Self-lock nut (6 strength)
N⋅m
kgf-m
lb-ft
2.4
0.24
2.0
4.9
0.49
3.5
8.8
0.88
6.5
21
2.1
15.5
44
4.4
32.0
84
8.4
61.0
133
13.3
96.5
203
20.3
147.0
298
29.8
215.5
A equivalent of 7T strength fastener
N⋅m
kg
f-m
lb
-ft
2.3
0.23
2.0
4.5
0.45
3.5
10
1.0
7.5
23
2.3
17.0
50
5.0
36.5
85
8.5
61.5
135
13.5
98.0
210
21
152.0
240
24
174.0
A equivalent of 8.8 strength bolt (8
strength nut) without flange
N⋅m
kgf-m
lb-ft
3.1
0.31
2.5
6.3
0.63
4.5
11
1.1
8.0
27
2.7
19.5
56
5.6
40.5
105
10.5
76.0
168
16.8
121.5
258
25.8
187.0
373
37.3
270.0
A equivalent of 8.8 strength bolt (8
strength nut) with flange
N⋅m
kgf-m
lb-ft
3.2
0.32
2.5
6.5
0.65
5.0
12
1.2
9.0
29
2.9
21.0
59
5.9
43.0
113
11.3
82.0
175
17.5
126.5
270
27
195.5
395
39.5
286.0
I1SQ01010004-01
I1SQ01010005-01
I1SQ01010006-01
I1SQ01010007-01
I1SQ01010008-01
I1SQ01010009-01
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