Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Standard Tightening Torque
Each fastener should be tightened to the torque specified in each article. 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.
- 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.
| Strength | Unit | Thread diameter (Nominal diameter) (mm) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 4 | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | ||||
| A equivalent of 4T strength fastener | N.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 | |||
| lbf-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 | N.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 | |||
| lbf-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 (1): Self-lock nut (6 strength) |
N.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 | |||
| lbf-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 | N.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 | |||
| lbf-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 | N.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 | |||
| lbf-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 | N.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 | |||
| lbf-ft | 2.5 | 5.0 | 9.0 | 21.0 | 43.0 | 82.0 | 126.5 | 195.5 | 286.0 | |||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.