﻿GET_GEVOMechL2_01_01_01_07 - ANIMATION Screen
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Threaded fasteners are tightened for the obvious reasons of clamping parts together and transmitting loads.

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In gasket joints, tightened fasteners prevent leakage.

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In other joints, the clamping force is developed to prevent the parts from separating or shaking loose.

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A screw or bolt thread is an extension of one of the basic machines: the inclined plane.

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This inclined plane, however, is wrapped around a shaft.

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When the thread is turned, it moves the mating part or nut up the inclined plane.

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When more turning force, or torque, is applied to the shaft, the more force is exerted on the nut.

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This force creates tension in the bolt, which clamps the mating parts together.

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Preload is the technical term for the tension caused by tightening the fastener that holds the assembled parts together.

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Generating sufficient preload force is the key to strong and reliable bolted joints that do not loosen or break under load.
