Standard torque chart by size

Using the correct bolt torque chart according to size and torque wrench not only ensures the durability of the connection but is also a core element in quality control. In the context of increasingly demanding technical requirements, tightening torque is no longer a matter of manual measurement, but has become a technical parameter that needs to be tightly controlled.

In modern systems requiring high precision and safety, each bolt size has its own standard torque corresponding to: bolt diameter, material strength grade, lubrication or dry conditions, and working environment (temperature, vibration)

1. Stainless steel tightening torque (Nm)

Stainless steel bolts typically have a lower tightening torque than steel bolts of the same size due to their characteristics: high friction, susceptibility to thread jamming, and lower strength compared to high-strength steel.

Bolt size	Stainless steel tightening torque (Nm)
M6	6-8 Nm
M8	15-20 Nm
M10	30-40 Nm
M12	50-65 Nm
M16	120-50 Nm

2. Automotive bolt tightening torque chart (common)

In the automotive industry, torque is extremely tightly controlled because it is directly related to safety

Location	Standard tightening torque (Nm)
Wheel bolts	90-120 Nm
Wheel bolts	40-100 Nm
Wheel bolts	150-300 Nm
Suspension bolts	100-200 Nm

3. High-Strength Steel Bolt Torque Chart

Size	8.8 (Nm)	10.9 (Nm)	12.9 (Nm)
M8	25	35	40
M10	50	70	85
M12	85	120	145
M16	200	280	330
M20	400	550	650

4. Bolt tightening torque chart for electromechanical equipment

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Size	Tightening torque (Nm)
M55	6 Nm
M68	10 Nm
M818	22 Nm
M1035	45 Nm

The able above is for reference only. In practice, torque adjustment is necessary when: Lubrication present → reduce torque by ~ 10-20% High vibration environment → increase torque or use threadlocker High temperature → changes material properties

See more: Torque error: The “hidden cost” you are unknow

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