Tsubaki Power-Locks offer extreme clamping strength from a keyless locking device. The precision made double taper design as simple as it is powerful. Available in bore sizes from 19 to 500mm, Tsubaki Power-Locks can mount any rotational component.

Disadvantage of ‘Poor Fit’:

  • The process of fixing the fit by machining the keyway into the shaft is tedious, permanent and expensive.
  • It reduces the strength and amount of torque a given shaft size can transmit.
  • Interference fits or welds prevent the operator from being able to easily remove the shaft from the hub for maintenance or replacement.

Avoid expensive interruptions in your operation! Tsubaki has the solution for you… Tsubaki’s Power-Locks! Tsubaki is a leader within the power transmission industry in the quest to find a better way to connect components to shafts.


  • Well-engineered, adjustable and affordable device that solves engineering and maintenance difficulties associated with other connection alternatives.
  • Shaft-to-hub friction connection that relies on concentric surface pressure to affix gears, sprockets, and other drive components to a motor-driven shaft.
  • It helps to eliminate problems with keyway connections and limitation for QD and tapered bushings.
  • The frictional, keyless system enables transmission of high-torque and axial loads, and accommodate reversing, dynamic or shock loading.
  • Available in both Inch and Metric sizes in a variety of styles.


  • Allows for easy attachment of shaft to hub without time and money spent on machining or extra assembly labour.
  • Provides solid connection between the hub and the shaft by using a keyless mechanical interference fit to transmit torque or withstand axial thrust.
  • The pressure created through the mechanical interference expands the Power-Lock to eliminate the gap between the hub and the shaft; the friction bond between the Power-Lock and the shaft/hub create a zero backlash connection.
  • Easy installation also allows the hub to be positioned more accurately on the shaft, and can facilitate angular timing of the hub.

Tsubaki Power-Locks can be used in such common applications as the connection of timing pulleys, sheaves, conveyor pulleys, indexing applications, sprockets, gears, cams, levers, motors and hydraulics, clutches and brakes and flange couplings.

Key Terms

  • AS Inch Series
  • AS Metric Series
  • AD Metric Series
  • KE Inch Series
  • AE Metric Series
  • EL Metric Series

Power Locks