Polyurethane Coupling Elements

Polyurethane coupling elements are resilient inserts fitted between the interlocking hubs of flexible couplings. Star and lobe shapes transmit torque through compression, absorb shock and reduce torsional vibration while allowing limited shaft misalignment, with hardness and geometry determining the element response.

Key facts

Family: Industrial Components
Common types: Curved-jaw spider, Straight-jaw spider, Open-centre spider, Solid-centre spider, Interlocking element
Materials: Cast polyurethane, Thermoplastic polyurethane, Polyether polyurethane
Used in: Motor-pump sets, Air compressors, Conveyors, Machine tools, Hydraulic power packs

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Types

Curved-jaw spider
Straight-jaw spider
Open-centre spider
Solid-centre spider
Interlocking element

Materials

Applications

Motor-pump sets
Air compressors
Conveyors
Machine tools
Hydraulic power packs

What to send for a quote

coupling size
lobe count and shape
outside and centre diameters
element width
hardness and duty

Questions about polyurethane coupling elements

What should I send to identify polyurethane coupling elements?

Send coupling size, lobe count and shape, outside and centre diameters, element width, hardness and duty. Do not identify hardness by colour alone; provide markings, dimensions and the coupling hub arrangement. A clear photograph, drawing or readable reference can resolve details that dimensions alone do not show.

How should I select polyurethane coupling elements?

Match geometry and hardness to coupling hubs, torque, speed, shock, temperature, chemicals and desired vibration damping. Confirm the mating parts and operating environment before ordering, since an apparently similar size can use a different profile, material or internal arrangement.

Last updated: 2026-10-08