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.
Found on http://www.boltscience.com/pages/glossary.htm

K Factor

Tensile strength in pounds per square inch divided by the Brinell Hardness number.
Found on http://www.metaltek.com/value-engineering/glossary.html
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