Flexible coupling: Oldham coupling
ø 3 - 25 mm Ruland Manufacturing Co., Inc.

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Oldham couplings are a three piece design comprised of two aluminum hubs press fit onto a center disk. Torque transmission is accomplished by mating the slots on the center disk to the drive tenons on the hubs. During operation the center disk slides on the tenons of each hub (which are orientated 90° apart) to transmit torque. While the couplings accommodate a small amount of angular and axial misalignment, they are especially useful in applications with parallel misalignment.

Ruland offers oldham couplings in set screw or clamp styles with bores ranging from 1/8" (3mm) to 1-1/8" (30mm). Inch and metric hubs (set screw, clamp style, keyed, or keyless) are interchangeable and can be combined into a single coupling as long as they have the same outside diameter. Oldham coupling hubs are standard in black anodized aluminum for improved lubricity, increased life, and low inertia. Hubs are also available in stainless steel upon request for increased corrosion resistance.