General Information: 0A-4
Standard Tightening Torque
Each fastener should be tightened to the torque specified in each section. 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
*:Self-lock nut
Strength Unit
Thread diameter (Nominal diameter) (mm)
4 5 6 8 10 12 14 16 18
A equivalent of 4T strength fastener Nâ‹…m 1.5 3.0 5.5 13 29 45 65 105 160
kgf-m 0.15 0.30 0.55 1.3 2.9 4.5 6.5 10.5 16
lb-ft 1.0 2.5 4.0 9.5 21.0 32.5 47.0 76.0 116.0
A equivalent of 6.8 strength fastener
without flange
Nâ‹…m 2.4 4.7 8.4 20 42 80 125 193 280
kgf-m 0.24 0.47 0.84 2.0 4.2 8.0 12.5 19.3 28
lb-ft 2.0 3.5 6.0 14.5 30.5 58.0 90.5 139.5 202.5
A equivalent of 6.8 strength fastener
with flange
*: Self-lock nut (6 strength)
Nâ‹…m 2.4 4.9 8.8 21 44 84 133 203 298
kgf-m 0.24 0.49 0.88 2.1 4.4 8.4 13.3 20.3 29.8
lb-ft 2.0 3.5 6.5 15.5 32.0 61.0 96.5 147.0 215.5
A equivalent of 7T strength fastener Nâ‹…m 2.3 4.5 10 23 50 85 135 210 240
kgf-m 0.23 0.45 1.0 2.3 5.0 8.5 13.5 21 24
lb-ft 2.0 3.5 7.5 17.0 36.5 61.5 98.0 152.0 174.0
A equivalent of 8.8 strength bolt (8
strength nut) without flange
Nâ‹…m 3.1 6.3 11 27 56 105 168 258 373
kgf-m 0.31 0.63 1.1 2.7 5.6 10.5 16.8 25.8 37.3
lb-ft 2.5 4.5 8.0 19.5 40.5 76.0 121.5 187.0 270.0
A equivalent of 8.8 strength bolt (8
strength nut) with flange
Nâ‹…m 3.2 6.5 12 29 59 113 175 270 395
kgf-m 0.32 0.65 1.2 2.9 5.9 11.3 17.5 27 39.5
lb-ft 2.5 5.0 9.0 21.0 43.0 82.0 126.5 195.5 286.0
I2RH01010012-01
I2RH01010013-01
I2RH01010014-01
I2RH01010015-01
I2RH01010016-01
I2RH01010017-01
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