There are two major types of the Torque Transmission variable pulley; standard variable speed pulleys and precision variable speed pulleys. The standard variable speed pulleys have a bore range from 1/4" to 3/4" in both the hex and the round shaft designs.
The precision line of our variable spring pulleys feature close tolerances on round shaft, molded keyway, and precisely ground and polished shafts along with a variety of spring pressures, ranging from 6 pounds to 82.
Contact us to learn about our variable pulley solutions or to inquire about non-standard sizes and designs.