The shaft coupling is the component which joins the propeller shaft to the gearbox output flange. Some are bolted directly to the gearbox but many installers use a flexible couple, such as R&D flexible couplings, which would then bolt to the gearbox. Our range includes couplings for most popular transmissions, bored for imperial or metric shafts.
Basic overview of the shaft couplings available:
Solid half coupling - these are usually held on to the boat propeller with roll pins or grub screws. Locates with a key.
Clamp on or split half couplings - The shaft end of the coupling slides over the boat propeller shaft and is then clamped into position by the clamp bolts. Larger size couplings are also located with a key and keyway.
Bobbin coupling - this is a double flanged coupling, used to space out the propeller shaft, or which can be used with two R&D flexible couplings to double insulated noise and vibration.
Coupling adaptors - some gearboxes have an output flange which does not mate to the standard R&D shaft coupling range. For some of these, there are adapters, which bolt to the gearbox output flange to allow a standard R&D shaft coupling to fit.