Flexible

Readily bent or deformed without permanent damage.

Flexural Modulus

The slope of the curve defined by flexural load versus resultant strain. A high flexural modulus indicates a stiffer material.

Flexural Strength

The strength of a material in bending expressed as the tensile stress of the outermost fibers at the instant of failure.

Flight

The spiral plates surrounding the tube of an auger.

Flow

(1) Turns drilling fluid flow on. (2) Turns air on.