NIULPFZTK Flo-Torq II Hub Kit for Mercruiser Alpha/Bravo & Mercury Outboards — 15-Spline Replacement, Complete 835257Q1 Kit

This hub kit supplies the core components needed to reinstall a Flo-Torq II propeller: forward thrust washer, drive sleeve, aft adapter, tab washer, and propeller nut. It is listed as a compatible replacement for OEM numbers 835257Q1 and 835257K1 and is intended for use with Mercury-compatible interchangeable propellers sized for 13 1/4x17 and 14 1/2x19 configurations. The parts are manufactured to withstand marine environments and allow a straightforward swap when restoring or upgrading a Flo-Torq II system.

How do I install the NIULPFZTK Flo-Torq II Hub Kit?

Installation follows a logical sequence that most mechanically inclined boat owners can complete with basic hand tools. Remove the existing locknut, locknut retainer, and forward thrust washer first, then assemble components in order and torque the locknut securely.

• Remove prop locknut, retainer, and forward thrust washer.
• Install the new forward thrust washer and insert the drive sleeve into the propeller hub.
• Slide the prop onto the shaft, add the drive sleeve adapter, then the locknut retainer and prop nut.
• Prevent shaft rotation, tighten to recommended torque, and apply marine grease to the spindle before final reassembly.

Which engines and propellers does this hub kit fit?

This hub kit is compatible with Flo-Torq II style propellers that accept a 15-spline drive sleeve and is used on a wide range of Mercruiser and Mercury/Mariner sterndrive and outboard applications. Confirm fit by matching OEM part numbers or spline count before purchasing.

• Direct replacement for OEM 835257Q1 and 835257K1 parts.
• Fits Mercruiser Alpha One and Bravo One sterndrives.
• Works with Mercury/Mariner outboards in the approximate 60–400 HP range when using Flo-Torq II props.
• Suitable for compatible prop sizes such as 13 1/4x17 and 14 1/2x19 where Flo-Torq II hubs are used.

What are the kit contents and material benefits?

The package contains the essential pieces to recreate a functional Flo-Torq II prop connection, each part designed for marine use and resistance to wear. Using a complete kit reduces the chance of mismatched parts and simplifies repairs.

• Includes forward thrust washer, drive sleeve, aft adapter, tab washer, and propeller nut.
• Components are built for corrosion resistance and long-term durability in salt or freshwater.
• Designed to protect propeller and drivetrain components from impacts and fatigue.
• Direct OEM-fit design reduces installation complexity and downtime.

How should I maintain the hub after installation?

Routine inspection and lubrication are the simplest ways to extend hub life and help prevent corrosion or seizure. Check torque and component condition after the first outings, and re-grease the spindle when the prop is serviced.

• Apply marine-grade grease to the spindle during reassembly and periodically thereafter.
• Inspect the drive sleeve and thrust washer for wear or impact damage each season.
• Verify locknut torque after the initial run and whenever you notice vibration or performance change.
• Replace the full kit if parts show scoring, cracking, or deformation rather than mixing old with new parts.

Who is this for: Boat owners, mechanics, and marina technicians who need a reliable, OEM-compatible replacement Flo-Torq II hub kit for Mercruiser Alpha One/Bravo One sterndrives or Mercury/Mariner outboards. It’s aimed at anyone restoring a Flo-Torq II prop installation, performing routine prop maintenance, or swapping between interchangeable propellers that use a 15-spline drive sleeve. If you match the OEM numbers or spline count and want a complete set of hub components for a straightforward installation, this kit meets those needs.