﻿GET_GEVOMechL2_01_01_01_16 - ANIMATION Screen
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So what is applied torque? If you tighten a bolt and nut with a torque wrench, the applied torque is dispersed to stretch the bolt and to overcome friction.

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Somewhere between 50% and 80% of the applied torque is needed just to overcome friction.

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The types of friction experienced when applying torque to the nut and bolt include nut face friction, thread friction, and thread torsion.

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Nut face friction is caused by the metal-to-metal contact between the nut face and the mating surface as the nut is being turned; and sometimes by dirt and corrosion.

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Thread friction is caused by irregularities in the thread surfaces, dirt, and corrosion.

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Thread torsion, also referred to as twist, occurs when the bolt begins to twist under the applied torque.

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So, how can we reduce this friction? Ensure that the hardware is clean, free of dirt and rust.

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In some cases, you may need a tap and die set to clean the threads of the bolt and nut.

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Apply proper lubrication to the threads and the faces of the bolt and nut.

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If a washer is used, apply lubrication to both sides of the washer.

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Always use the lubricant specified in the maintenance manual instructions.

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Lubricants are not interchangeable; each type of lubricant can affect the clamping load differently.

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The physical makeup of the parts may influence the torque values being applied.

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Always refer to the maintenance manual for the correct torque values and proper lubricant for each application.
