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TABLE OF STANDARD TIGHTENING TORQUES
• Use specified bolts and nuts and tighten them at specified torques according to the following table, unless otherwise
specified.
• Threads and contact seats shall be dry.
• Where there is a difference in strength classification between the nut and bolt (or stud bolt), the torque specified for the
bolt shall apply.
Hex-head Bolt and Stud Bolt
Strength
classification
Repre-
sentation
Diameter
symbol
2 to 3
M 5
{1.4 to 2.2, 0.2 to 0.3}
4 to 6
M 6
{2.9 to 4.3, 0.4 to 0.6}
9 to 14
M 8
{6.5 to 10, 0.9 to 1.4}
19 to 28
M 10
{14 to 20, 1.9 to 2.8} {13 to 20, 1.8 to 2.7} {25 to 40, 3.5 to 5.5} {25 to 36, 3.5 to 5.0} {33 to 43, 4.5 to 6.0} {31 to 50, 4.3 to 6.9}
35 to 50
M 12
{25 to 36, 3.4 to 5.0} {22 to 34, 3.1 to 4.7} {51 to 69, 7.0 to 9.5} {47 to 61, 6.5 to 8.5}
60 to 85
M 14
{43 to 61, 6.0 to 8.5} {40 to 54, 5.5 to 7.5} {87 to 115, 12 to 16} {80 to 100, 11 to 14} {94 to 130, 13 to 18} {87 to 120, 12 to 17}
90 to 130
M 16
{69 to 94, 9.5 to 13}
140 to 190
M 18
{100 to 135, 14 to 19} {87 to 115, 12 to 16} {180 to 255, 25 to 35} {160 to 215, 22 to 30} {215 to 290, 30 to 40} {190 to 255, 26 to 35}
190 to 260
M 20
{135 to 190, 19 to 26} {120 to 165, 17 to 23} {260 to 345, 36 to 48} {230 to 310, 32 to 43} {295 to 405, 41 to 56} {265 to 360, 37 to 50}
260 to 340
M 22
{190 to 255, 26 to 35} {165 to 225, 23 to 31} {345 to 470, 48 to 65} {310 to 420, 43 to 58} {405 to 540, 56 to 75} {360 to 490, 50 to 68}
340 to 450
M 24
{255 to 330, 34 to 46} {210 to 290, 29 to 40} {455 to 620, 63 to 86} {395 to 535, 55 to 74} {535 to 725, 74 to 100} {460 to 620, 64 to 86}
Hex-head Flange Bolt
Strength
classification
Repre-
sentation
Diameter
symbol
4 to 6
M 6
{2.9 to 4.3, 0.4 to 0.6}
10 to 15
M 8
{7.0 to 11, 1.0 to 1.5}
21 to 30
M 10
{15 to 22, 2.1 to 3.1} {14 to 21, 1.9 to 2.9} {28 to 43, 3.9 to 6.0} {26 to 39, 3.6 to 5.4} {36 to 47, 5.0 to 6.5} {33 to 47, 4.5 to 6.5}
38 to 54
M 12
{27 to 40. 3.8 to 5.5} {25 to 38, 3.4 to 5.2}
00-18
4 T
(Stud)
—
{2.9 to 4.3, 0.4 to 0.6}
—
{5.1 to 8.0, 0.7 to 1.1}
—
{12 to 19, 1.7 to 2.6}
18 to 26
31 to 46
55 to 75
90 to 120
{65 to 87, 9.0 to 12} {130 to 175, 18 to 24} {115 to 160, 16 to 22} {145 to 195, 20 to 27} {135 to 190, 19 to 26}
120 to 160
170 to 230
230 to 300
290 to 390
4 T
—
{5.8 to 8.7, 0.8 to 1.2}
—
{14 to 20, 1.9 to 2.8}
20 to 28
35 to 51
{58 to 80, 8.0 to 11}
7 T
(Stud)
4 to 6
—
7 to 11
—
17 to 26
—
36 to 52
33 to 49
70 to 95
65 to 85
120 to 160
110 to 140
180 to 240
160 to 220
260 to 340
220 to 290
350 to 470
320 to 420
470 to 640
430 to 570
630 to 840
540 to 730
7 T
8 to 12
—
19 to 28
—
39 to 58
37 to 53
80 to 110
70 to 95
{51 to 69, 7.0 to 9.5}
Unit : N·m {lbf.ft, kgf·m}
8 T
(Stud)
5 to 7
—
{3.6 to 5.1, 0.5 to 0.7}
8 to 12
—
{5.8 to 8.7, 0.8 to 1.2}
20 to 29
—
{14 to 22, 2.0 to 3.0}
45 to 60
41 to 59
85 to 110
75 to 100
{61 to 80, 8.5 to 11}
{54 to 72, 7.5 to 10}
130 to 180
120 to 160
200 to 270
190 to 260
290 to 390
260 to 340
410 to 550
370 to 490
550 to 740
490 to 670
730 to 980
630 to 840
Unit : N·m {lbf.ft, kgf·m}
8 T
9 to 14
—
{6.5 to 10, 0.9 to 1.4}
22 to 32
—
{16 to 24, 2.2 to 3.3}
50 to 65
45 to 65
90 to 120
85 to 110
{65 to 87, 9.0 to 12}
{61 to 80, 8.5 to 11}
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