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Flexible Shaft Couplings

Flexible Shaft Couplings

Mfr. PYI

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On Sale $293.77
The PYI Flexible Shaft Coupling reduces vibration from engine and transmission, compensates for minor misalignments, and isolates the shaft while absorbing shock loads.

  • Ideal for marine engine installations
  • Polyurethane flange creates a flexible barrier to reduce drive train noise and vibration to quiet your drive train
  • Absorbs transmission shock loads caused by the propeller and high speed gear changes
  • Fail safe design, both forward and reverse thrust is taken in compression from the steel straps, giving a durable design even in extreme conditions
See Additional Specs.
Part No. Mfr No. Gear Manufacturer Gear Flange Diameter No. Bolts Bolt Pitch Circle Unit Leaves Warehouse* List Price
Your Price
Flexible Shaft Coupling, 910-037
79410 910-037 Yanmar 5.12" 4 4.25" Each 2 Days $335.58
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* Leaves Warehouse: Does not include Weekends and Holidays.
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Additional Description
The polyurethane disc is backed up by two metal compression straps, one on either side of the flexible coupling. These metal straps hold the system in constant compression, whether the drive train is in forward or reverse. This feature extends the life of the system dramatically.

The R & D Flexible Coupling will also absorb shock loads, resulting from gear changes or the propeller striking a submerged object. The polyurethane disk will distort with light shock loads and is designed to be sacrificial in the event of severe shock load, saving on expensive drive train repairs. If the disc is destroyed from massive shock load, the metal compression straps keep the coupling intact, ensuring that the drive system is functional in both forward and reverse.

Review and FAQ Center

PYI shaft flexible coupling - will it reduce vibration?

On sailboat engine,with a Yanmar 2GM13 with 1 inch shaft, does this PYI coupling reduce vibration?


Yes it will reduce shaft vibration to some degree. Having all the parts aligned is key – there are also shaft couplers that will reduce vibration.

Submitted by: bobB

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