Since its introduction in 2000, the Concentric Maxi Torque system has NEVER failed a customer.

Superior concentricity and flexible positioning

Twelve sizes cover bores from .125 in. (2mm) to 1.1875 in. (30mm)

Outperforms set screws, keyways, clamp collars and other tapered locking devices

Perfect for timing pulleys, gears, sprockets, pinch rollers, couplings and more...

Patent Number 6,568,063

Innovative.The Concentric Maxi Torque system is a keyless shaft to hub connection solution. It was designed and developed specifically to suit the shaft to hub connection needs of small shafts and drive components in the motion control and power transmission markets. This patented keyless shaft to hub connection system enables customers to easily phase, install, adjust and remove drive components, all while offering precise component positioning.

Concentric.With radial runout less than .001/.026mm as assembled, the Concentric Maxi Torque system enables customers to attain higher drive speeds, reduce unwanted vibration and maintain concentricity, offering a superior connection solution.

Reliable.The mechanical shrink fit accomplished by the Concentric Maxi Torque system provides torque capacity which far exceeds that of two set screws arranged perpendicular to the shaft, offering the most reliable connection in the industry.

Economical.The compact design eliminates the need for the extended hubs used to accommodate setscrews, allowing motion systems engineers to design drives which are lighter and use less space. Additionally, the shaft damage and added expense of shaft modification often associated with the use of set screws or pins is eliminated.

Versatile.The Concentric Maxi Torque system is currently being manufactured for synchronous belt drives in standard inch and metric pitches, for shaft sizes ranging from .125 in. (2mm) to 1.1875 in. (30mm). Other drive systems, including gears, sprockets, bearing assemblies, couplings, etc., will be quoted upon request.