Miniature rigid couplings down to 3 mm bore size


Ruland now offers miniature rigid couplings with bore sizes as small as 3 mm. Miniature rigid couplings are suitable for micro component applications where misalignment is neither present nor desired, including connecting line-shafts, attaching a motor to a gearbox, and servo applications. Offering high torque capacity, stiffness and zero backlash, Ruland’s rigid couplings are increasingly being used in precision motion control applications where misalignment is tightly controlled.

Ruland’s miniature rigid couplings are available in aluminum, carbon steel or stainless steel. The bores of the couplings are precision honed in the manufacturing process, assuring tolerances of +.05/-.00 mm. This enhances the overall performance of the couplings, especially important for applications that require strict control of shaft alignment and greater torque transmission ability. All rigid couplings from Ruland have Nypatch socket head cap screws for increased performance and reliability. This coating is designed to reduce screw vibration, which can cause the screws to loosen and torque transmission ability to diminish during the course of normal use.

Rigid couplings are available in one-piece clamp style, two-piece clamp style and set screw style versions, with or without keyways. A large number of standard sizes are available in straight and step bore combinations to fit shafts ranging from 1/8" to 2" in the inch dimension series and from 3mm to 50mm in the metric dimension series. Inch to metric conversion couplings are also available by special order.


• Bore B1 (mm) 50 • Bore B2 (mm) 50 • OD (mm) 85 • Length L (mm) 124 • Keyway K (mm) 14 • Forged Set Screw M10
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