V.. Glossary of Fastener and Fixing Terminology

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VARGAL NUT

Spring contained all metal locking nut used in the Railway industry   Product

VICKERS HARDNESS TEST 

The Vickers test is often easier to use than other hardness tests since the required calculations are independent of the size of the indenter, and the indenter can be used for all materials irrespective of hardness. The basic principle, as with all common measures of hardness, is to observe the questioned material's ability to resist deformation. 

Hardness

VIRTUAL EFFECTIVE DIAMETER  

The effective diameter of a thread but allowing for errors in pitch and flank angles.

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