The NorthStar Slim Tach encoder product line incorporates a bearingless and ultra-thin design for longer encoder life and variety of motor mounting possibilities. The Slim Tach line was designed specifically to meet the heavy duty needs of the process industry. 

They use proven Magnetoresistive technology to precisely track machine speed for better control. Unique features include:

Direct mounting to a NEMA 56C or 180 TC motor endbell.

Hard anodized aluminum construction for strength and durability.

Elimination of flexible couplings for operation.