Ruland Manufacturing's stepped bore rigid couplings with standard keyways in each bore. The couplings are a two-piece style allowing for easy assembly and disassembly without moving other components. Hardware is opposing for balance, allowing for higher speeds with reduced vibration.

Rigid couplings are often used to connect motors to shafts where misalignment is neither present nor desired.  These couplings have zero backlash so are suitable for motion control and shaft-to-shaft applications.

Keyways increase the torque capacity of the coupling by creating a positive drive while ensuring the precise rotational positioning of the shafts. The added torque capacity provided by the keyway may be needed in applications with shock load due to sudden starts and stops or reversals, when the bore is small relative to the coupling OD, when the shaft may be undersized or when temperature changes may alter the size of the shaft or bore in application. Precise rotational positioning may be needed in applications where shaft phasing is important for timing.

The couplings are offered in one- or two-piece styles in aluminum, black oxide carbon steel and stainless steel with bore sizes from 1/8" to 2".