SKU: CW54876
UPC: 839662003964
MPN: 910-029
The R & D Marine flexible shaft coupling is engineered for boat owners running Borg Warner, Hurth, ZF, Volvo, or PRM gearboxes with a 5-inch output flange. This UK-manufactured coupling installs between the transmission output and propeller shaft coupling, serving as a critical interface that protects the drivetrain from vibration, shock loads, and minor misalignment. Rated for 20 horsepower per 100 revolutions per minute, it delivers reliable performance for auxiliary sailboat engines and smaller displacement powerboats. Browse our complete selection of shaft couplers to find the right fit for your vessel's drivetrain configuration.
The coupling features a contoured flexible disc molded from polyester elastomer with integrated steel compression straps. This fail-safe design maintains drive in both forward and reverse should the disc ever fail, a critical safety feature when operating offshore or in remote waters. The disc's contoured profile allows controlled flex to compensate for temporary engine and shaft misalignment without imposing side loads on transmission bearings. The elastomer construction is impervious to salt water, diesel fuel, and lubrication oils, eliminating concerns about degradation in harsh marine environments. Flange specifications include a 5.00-inch diameter, four mounting holes at 0.44-inch diameter on a 4.25-inch bolt circle, and a 2.50-inch pilot diameter. Installation requires no machining—the coupling bolts directly to compatible transmission flanges. Pair this coupling with quality engine mounts for complete vibration isolation.
This coupling suits sailboat auxiliary installations, light-duty trawlers, and displacement cruisers where vibration reduction and drivetrain protection are priorities. The elastomer disc absorbs propeller thrust, eliminating the need for a separate thrust bearing in many applications while reducing engine noise transmitted through the hull. Shock loads from propeller strikes or sudden throttle changes are dampened before reaching the transmission. For complete drivetrain maintenance, consider inspecting your shaft seals when servicing couplings. We stock the full R & D Marine line of flexible couplings for various flange sizes and horsepower ratings.
This coupling fits Borg Warner, ZF, Hurth, Volvo, and PRM gearboxes equipped with a 5-inch output flange. The 4.25-inch bolt circle and 2.50-inch pilot diameter must match your transmission's flange specifications for proper installation.
The coupling features a fail-safe design with steel compression straps molded into the elastomer disc. If the disc fails, these straps maintain drive capability in both forward and reverse, allowing you to return to port under power rather than being stranded.
No machining is required. The coupling bolts directly to compatible transmission output flanges using the four existing mounting holes. Standard hand tools are sufficient for installation, making it accessible for DIY boaters.
The polyester elastomer construction is impervious to salt water, diesel fuel, and lubrication oils. This chemical resistance ensures long service life even in engine compartments where fuel and oil exposure is common.
In many applications, no. This flexible coupling is designed to accept propeller thrust loads, which can eliminate the need for a dedicated thrust bearing. Consult your engine and shaft configuration to confirm suitability for your specific installation.
WARNING ⚠️ You must be 18 or older to purchase shotgun or rifle ammunition and 21 or older to purchase handgun ammunition and firearms. Please reference our requirements for ammunition orders to "restricted" states HERE. Always make sure you use the correct ammunition for your firearms. Ammo cannot be shipped to a PO Box. Please reference state & local laws before making a firearm or ammunition purchase.
R & D Marine
R & D Marine
R & D Marine
R & D Marine
R & D Marine