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Table 1 Tightening torque for bolts not specified in text
Nominal size of thread
× pitch
a (mm)
6 × 1
8 × 1.25
10 × 1.5
12 × 1.75
14 × 2
16 × 2
18 × 2.5
20 × 2.5
22 × 2.5
24 × 3
27 × 3
30 × 3
33 × 3
36 × 3
39 × 3
Width across flats
(= Socket size)
b (mm)
10
13
17
19
22
24
27
30
32
36
41
46
50
55
60
13
Tightening torque
Target
12
{1.2}
25
{2.5}
54
{5.5}
89
{9}
137
{14}
230
{23.5}
315
{32}
460
{47}
650
{66.5}
810
{82.5}
1180
{120}
1520
{155}
1960
{200}
2450
{250}
2940
{300}
Tightening torque
Unit: Nm {kgm}
Range
8.8 – 14.7
{0.9 – 1.5}
14.7 – 34
{1.5 – 3.5}
34 – 74
{3.5 – 7.5}
54 – 123
{5.5 – 12.5}
84 – 196
{8.5 – 20}
147 – 309
{15 – 31.5}
201 – 427
{20.5 – 43.5}
319 – 608
{32.5 – 62}
471 – 829
{48 – 84.5}
588 – 1030
{60 – 105}
883 – 1470
{90 – 150}
1130 – 1910
{115 – 195}
1470 – 2450
{150 – 250}
1860 – 3040
{190 – 310}
2260 – 3630
{230 – 370}
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