Surface feet per minute (SFPM or SFM) is the combination of a physical quantity (surface speed) and an imperial and American customary unit (feet per minute or FPM). It is defined as the number of linear feet that a location on a rotating component travels in one minute.
Surface feet per minute (SFPM or SFM) is a combination of surface speed and an imperial unit, defined as the distance traveled by a point on a rotating component in one minute.