Y... Glossary of Fastener and Fixing Terminology

 yield, controlled-tightening, yield-point, yield-strength

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YIELD CONTROLLED TIGHTENING             

Fastener tightening method which allows a fastener to be tightened to yield. The angle of rotation of the fastener is measured relative to the applied torque, yield being assessed when the slope of the relationship changes to below a certain value. Sometimes called joint controlled tightening.

YIELD POINT 

The load per unit of original cross-section area at which a marked increase in the deformation of the specimen occurs without increase in load . Usually calculated from the load determined by the drop of the beam of the testing machine or by use of dividers. 

YIELD STRENGTH 

The stress at which a material exhibits a specified deviation from proportionality of stress and strain. An offset of 0.2% is used for many metals.

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