How to identify shaft couplings
Couplings transmit torque between two shafts while accommodating some misalignment.
Have one in front of you? Photograph it and get an evidence-backed identification.
Identify from a photoIdentification clues
- —Hub style and flexible element (spider, disc pack, grid, tyre)
- —Bore diameters and keyways
- —Outside diameter and overall length
- —Cast or stamped size code
- —Set screws or clamping hubs
Common types
- —Jaw / spider
- —Gear
- —Disc
- —Grid
- —Tyre
- —Oldham
- —Bellows
Typical failure modes
- —Element wear or cracking
- —Hub fretting on the shaft
- —Misalignment fatigue
- —Fastener loosening
What a replacement must match
- —Match bore and keyway sizes
- —Match torque rating and speed
- —Match element hardness
- —Check axial space available
Photos that help identification
- —Photograph both hubs and the element
- —Measure the bores
- —Show any cast size markings
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Find a replacementRelated components
General reference information. Always verify against the manufacturer’s documentation before ordering or installing.