Designed for use with 90 or 180V speed controllers of Nema Type K DC power supplies on constant or diminishing torque applications. Use for conveyors and processing machinery. Motors have a 10-32 1/2" deep tapped hole on the shaft and fan, this hole can be used to mount a pulse generator suitable for use with Tach Feedback for DC controls. Most motors are 56 frame models with a removable base and some are footless.