Heavy Duty 1.25 Prop Shaft Hub Kit For Mercury Marine Racing 8M0183487 840389K06

Heavy Duty 1.25 Prop Shaft Hub Kit for Mercury Marine Racing

A heavy-duty 1.25-inch propeller shaft hub kit that replaces Mercury Marine Racing part numbers 8M0183487 and 840389K06 to secure the propeller on high-performance outboards.

Overview

This prop shaft hub kit provides a rugged mounting solution for high-output Mercury Marine Racing outboards. The 1.25-inch hub assembly grips the propeller firmly under extreme torque and rpm conditions. Racers and serious performance boaters rely on this kit to minimize prop slip and maintain consistent thrust.

Built For Performance

• Heat-treated stainless steel hub resists deformation during hard launches
• Precision-machined taper ensures a snug fit on the prop shaft
• Thick thrust washer distributes load evenly across the propeller face
• Self-locking nut design stays tight even under high vibration
• Corrosion-resistant finish stands up to saltwater racing

On-The-Job Use

• High-speed offshore and circle track outboard racing
• Bass boat tournament setups pushing top-end speeds
• Performance-tuned recreational boats with modified engines
• Propeller testing and water sports demos requiring quick changes

Specs At A Glance

Good To Know

Q: Is this hub kit compatible with Mercury Marine’s standard 1.25-inch prop shaft? A: Yes, the kit is machined for Mercury Marine Racing’s 1.25-inch shafts and matches OEM dimensions; verify your serial number if you have an early production engine.

Q: Can I reuse the original thrust washer or propshaft nut? A: The kit includes all new thrust hardware; reusing old parts may compromise the locking feature and is not recommended.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.