Why is the torque different when tightening and loosening?-Wangsheng Fastener|Chinese fastener manufacturer

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Why is the torque different when tightening and loosening?

Apr 18,2023

When loosening, if the components are under the same conditions, the applied torque only has to overcome the friction force.

When loosening, if the components are under the same conditions, the applied torque only has to overcome the friction force.Therefore, there are some exceptions to this rule that the torque required to loosen the fasteners is lower.Due to different friction conditions, higher torque may also be required when loosening fasteners.Corrosion, jamming, or rough surface can greatly increase friction, resulting in increased loosening torque.

With the use of anti-loosening washers, the difference between the tightening torque and the loosening torque will be greater.During fastening, sliding occurs between the bolt head or nut and the serrated surface of the upper lock washer

However, when loosening, sliding occurs between the cam surfaces of the washer, which greatly reduces the friction.

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The gap between the unit price ratio of China's fastener exports and imports is getting bigger and bigger

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