top of page

Keep the propeller performance of your Mercury Racing outboard with our new Fat Shaft Flo Torq Hub Kit.


This high-performance hub kit is designed to maximize the transfer of power 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 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


The durable construction and precision-engineered washers and prop nuts ensure that 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

Fat Shaft Hub Kit for Mercury 1.25" Prop Shaft

SKU: 840389K06-77
    bottom of page