Sustain brand-new OEM-like propeller performance for your Mercury Racing outboard or HD MerCruiser with a new Fat Shaft Flo-Torq Hub Kit. This high-performance hub kit is engineered to deliver smooth power transfer, reduce vibration, and extend the life of your propeller and shaft.
Whether you're looking for durability in demanding racing conditions or reliable strength in everyday use, this kit is designed to fit seamlessly with your Mercury setup, providing optimal efficiency and performance.
This high-performance hub kit provides maximize power transfer from your engine to the propeller on any Mercury Marine Verado / ProXS / Mercury Racing EFI / Optimax with Sportmaster Torquemaster Lower Units with the 1.25" Prop Shafts.
These outboards are often fitted with HD gear cases with the larger 1 1/4" propeller shaft found on 260 HP, 280 ROS, 300 Drag, 300 Pro Max, 300X, 300XS, 250R, 300R, 400R, and 450R outboards. It also fits Fleetmaster, Verado 5.25" Gearcases, MerCruiser Bravo 1 XR, and XZ sterndrives.
The durable construction and precision-engineered washers and prop nuts ensure your propeller stays secure.
Easy to install and compatible with a wide range of Flo-Torq (aka square hub) propellers, this hub kit is a must-have for any high-performance boater with Mercury Racing outboards looking for new or spare hub kits.
Our kit comes complete as pictured with one (1) extreme-duty design cushioned hub, one (1) thick case hardened washer, one (1) spring washer to secure the prop, one (1) flat finishing washer, and one (1) brass Nyloc prop nut.
Replaces Mercury / Quicksilver OEM Part Numbers: 840389A1, 840389A2, 840389A5, 840389K06, 840389K5, 840389K06, 840389Q06, 12-840383A2