10287349 Rexnord Omega ES5-R Coupling

The 10287349 Rexnord Omega ES5-R Coupling Element, also identified by Rexnord catalog number 7300090, is an OEM elastomeric flexible element for the Rexnord Omega spacer-style drive coupling system. The element transmits operational torque between two hubs mounted on connected shafts while absorbing torsional vibration and compensating for the angular and parallel shaft misalignment that develops during normal operation, thermal expansion, and equipment settling. The split-in-half element design allows installation and replacement without disturbing the hubs, shafts, or connected equipment, which reduces downtime during scheduled maintenance.

Spacer style vs. close-coupled: Rexnord Omega elements are produced in two body styles that share the same hubs. The standard E-series elements are close-coupled and used when the motor output shaft and driven shaft ends sit close together. The ES-series elements like the ES5-R have an extended center body that bridges a gap between widely-separated shafts, removing the need for a separate spacer shaft or extended hub setup. Ordering the wrong body style is a common compatibility issue — confirm whether your equipment uses the short E or long ES configuration before ordering. The size 5 family also includes the E5 close-coupled version under part number 10287333 if your application requires the shorter body.

The Omega ES5-R element serves across a wide range of industrial power transmission applications including centrifugal and reciprocating pumps, centrifugal and reciprocating compressors, industrial fans and blowers, forced draft fans, mixers and agitators, cooling tower drives, metal extruders, conveyor drives, and motion control systems. The coupling operates in both horizontal and vertical shaft orientations without modification and requires no lubrication, eliminating the maintenance and contamination risks associated with grease-packed gear couplings.

The standard 10287349 element is supplied in orange polyurethane, formulated for high misalignment capacity and broad chemical resistance to oils, greases, and common industrial fluids. The ES5-R ships as a complete element kit including the split urethane body, cap screws, and high-speed rings. Coupling hubs are sold separately and selected to match the customer shaft bore and locking style (rough bore, Taper-Lock, or QD bushed configurations).

When to replace the Omega ES5-R element: Inspect the coupling at every scheduled service interval and watch for symptoms including elevated vibration during loaded operation, audible rumbling or knocking from the coupling area, visible cracking or hardening of the urethane element, permanent set or deformation of the element profile, and signs of element wear at the hub contact points. Replace the element at the first sign of wear to protect the bearings, shaft seals, and connected equipment from accelerated wear caused by uncontrolled torsional spikes passing through the drivetrain.

Direct OEM Rexnord replacement. Hubs sold separately. Available from Stark Industrial Products with same-day shipping on in-stock orders and 24/7 phone support at (903) 768-1111 to confirm element size, body style, and matching hub part numbers for your application.