GELAIDI Flo-Torq II Replacement Hub Kit for Mercury 60–300 HP — 15-Spline, Complete Prop Hub Assembly

GELAIDI Flo-Torq II hub kit replaces the factory hub assembly on compatible Mercury outboards 60–300 HP — restoring propeller engagement and reducing vibration.

This complete hub kit is built to fit Mercury outboard engines in the 60–300 horsepower range and is designed as a modular replacement for Flo-Torq II systems (reference no. 835257Q1). It’s manufactured to match OEM spline counts and prop dimensions so you can swap in a like-for-like hub set when your original hub shows wear, damage, or slipping. The kit includes the forward thrust washer, drive sleeve, aft adaptor, tab washer and propeller nut required for a straightforward installation.

How do I know this hub kit fits my Mercury outboard?

Confirm fit by checking your engine model and existing propeller specifications. This kit is intended for Mercury outboards rated 60–300 HP and uses a 15-spline drive; it supports prop diameters commonly stamped 13 1/4×17 and 14 1/2×19 as original factory options.

• Verify engine HP and model year against your service manual.
• Check spline count on the driveshaft—this kit is 15-spline.
• Compare propeller dimensions (13 1/4×17 or 14 1/2×19) before purchase.
• Reference part number 835257Q1 for cross-checking compatibility.

What parts are included and what tools will I need?

The kit ships complete with the main components needed to replace a Flo-Torq II hub assembly, so you won’t have to source individual pieces. Basic marine hand tools and proper torque equipment are required for correct installation and safety.

• Included: forward thrust washer, drive sleeve, aft adaptor, tab washer, and propeller nut.
• Tools: socket set, torque wrench, snap-ring pliers, and marine grease.
• Installation time: typically one hour for an experienced mechanic.
• Follow manufacturer torque specs when tightening the propeller nut.

Will this kit work with aftermarket or MerCruiser props?

Yes — the GELAIDI hub kit is compatible with many interchangeable propellers and drive systems that accept the Flo-Torq II standard. It fits Mercury interchangeable props and many Michigan Wheel and MerCruiser Alpha/Bravo drive configurations that use the same hub interface.

• Compatible with Mercury interchangeable props designed for Flo-Torq II.
• Works with MerCruiser Alpha and Bravo One drives when hub specs match.
• Accepts many aftermarket propellers built to Flo-Torq II dimensions.
• Always verify prop fit before final installation to prevent mismatch.

Who is this for: Boaters and marine technicians who need a direct-replacement hub assembly for Mercury outboards between 60 and 300 HP, including owners using OEM or compatible aftermarket props. This kit is aimed at people who want a modular, easy-to-install flo-torq replacement (ref. 835257Q1) to restore prop engagement, reduce vibration, and maintain driveline safety. If you’re uncertain about fitment, consult your engine manual or a qualified marine technician before ordering.