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Glossary of terminology on topics
related to nuts and bolts,
threaded
fasteners and tightening techniques....
K FACTOR
The factor in the torque tightening equation: T=KDF where T is the
fastener tightening torque in Newton metres, D is the fastener
diameter in metres, F is the fasteners preload in Newtons and K is a
factor whose value is often taken as 0.2.
The formula gives the
approximate tightening torque for
standard fasteners used under
normal conditions.
LOCK NUT
There are two common usage's of this term:
1. A nut which provides extra resistance to vibration loosening by
either providing some form of prevailing torque, or, in free
spinning nuts, by deforming and/or biting into mating parts when
fully tightened.
2.
The term is sometimes used for thin (or jam) nuts used to lock a thicker
nut. When used in this way the thin nut should be adjacent to the joint
surface and tightened against the thick nut. If placed on top of the thick
nut the thin nut would sustain loads it was not designed to sustain
difficulties may prevent its widespread
adoption.
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