Buck Algonquin Shaft Coupling 50-MC3500

3.410" Buck Algonquin Split Propeller Shaft Coupling for Universal Atomic 4 Marine Transmissions.

The Buck Algonquin 50-MC3500 Split Shaft Coupling is engineered specifically for Universal Atomic 4 marine transmissions, providing a precise and secure connection between the transmission output flange and propeller shaft.

With a 3.41" flange diameter, this coupling is tailored for Atomic 4 drivetrain setups commonly found in classic sailboats and smaller inboard vessels. The split coupling design allows for simplified installation and removal without requiring full shaft disassembly—making it ideal for maintenance, repower projects, and routine service.

Constructed from high-strength ductile iron and machined to strict marine tolerances, the MC3500 ensures reliable power transfer, proper shaft alignment, and long service life in demanding inboard applications.

Coupling dimensions

• Flange Diameter: 3.410"
• Shaft Range: 3/4" Thru 1 1/8"
• Pilot Diameter: 1 7/8" x 1/4" Female
• Bolt Circle: 2 3/4"
• Bolt Diameter: 3/8"
• Coupling Length: 2.437"
• # of Bolts: 3 (New flange bolts included)