﻿GET_GEVOMechL2_01_01_01_20 - ANIMATION Screen
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Bolt elongation measurement is a tightening method that still depends on torque to stretch a bolt, but provides improved measurement of the actual clamping force that is produced.

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In this method, accuracy is achieved by measuring the length of the bolt before torque is applied, and then measuring it again after the torque has been applied.

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Once you measure the amount of stretch in the bolt, you can estimate the amount of clamping force produced.

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A disadvantage of this type of tightening is that it allows only one bolt to be tightened at a time, which can lead to uneven clamping and point loading along gaskets and surfaces that are being joined.

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Also, bolt elongation measurement cannot account for variations in bolt shank size, which will change the amount of clamping force that is produced.

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When a 2 inch diameter bolt and a 7/8 inch diameter bolt are stretched an identical distance, the larger of the two bolts produces more clamping force.
