Stop reverse motion in its tracks. These sprockets use a clutch to transfer torque in one direction and spin freely in the other. They're often used for backstopping, indexing, and overrunning. For example, in two-speed systems, they connect the low-speed motor to the main drive. When the high-speed motor takes over, they stop transferring power and spin in the opposite direction. All are made in the U.S.

The tapered barrel on these bushings is split on both sides, allowing them to contract more tightly around the shaft than quick-disconnect and taper-lock bushings. They're for use with split-tapered sprockets and pulleys of the same bushing trade number. As you tighten the included screws, the bushing grips the shaft and pulls it into the sprocket or pulley.