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A condition where one mechanical part is fit into another in such a way as to leave a small gap or clearance between parts.

Abbreviation for computer numerically controlled. CNC refers to machining equipment where tool motion and spindle speeds are controlled by a computer.

Weakness in metal, wood or other material resulting from prolonged stress.

Feet per minute. A measurement of velocity in terms of the distance traveled in feet over a period of one minute.

A force tangential to the common boundary of two bodies in contrast that resists the motion or tendency to motion of one relative to the other.

The relative resistance of a metal to denting, scratching, or bending. Hardness of metallic shafts is typically expressed as a relative value from the Rockwell C or Brinell hardness scales.

A frame, bracket, or box for holding or protecting a mechanical part. Ex. bushing plate.

Inside diameter. A measurement taken from a point on the inner surface of a round object, along a straight line through the center of the object to a point on it’s opposite inner surface.

The condition whereby one part slightly oversized is fitted into another.