Quicksilver Flo-Torq SSR Propeller Hub Kit for 1" Shaft — 8M0150152, Quiet Soft-Shift Upgrade for Mercury 40–225hp

Quicksilver 8M0150152 Flo-Torq SSR propeller hub kit is a soft-shift replacement hub designed to reduce shift noise and vibration for select Mercury outboards with a 1" propeller shaft.

This SSR (Soft-Shift Rubber) hub kit is engineered as an upgrade path from Flo-Torq II and as a compatible replacement for Flo-Torq III and IV hubs, offering quieter, smoother delivery of engine power to the propeller. It fits many Mercury Command Thrust 40–115hp models and a broad range of Mercury FourStroke outboards up to 225hp that use a 1" diameter propeller shaft. The kit includes all necessary internal components to restore or improve propeller-drive engagement and protect driveline components during impacts.

Will this hub kit fit my Mercury outboard?

The 8M0150152 SSR hub is intended for Mercury outboards with a 1" diameter propeller shaft, covering Command Thrust 40–115hp models and most FourStroke engines up to 225hp when used in standard, non-surface-piercing applications. Confirm your prop shaft diameter and engine model before ordering to ensure correct fitment.

• Covers Mercury 40–115hp CT outboards and many FourStroke up to 225hp
• Designed for 1" propeller shafts only
• Works as upgrade for Flo-Torq II and replacement for III/IV hubs
• Not for heavy-duty 1.25" shafts or specified solid/HD SSR kits

How does SSR technology improve shifting and driveline protection?

SSR uses a tuned soft-rubber interface to absorb shock and damp the abrupt engagement that causes clunks, vibration and propeller rattle. The result is a measurable reduction in shift-event noise and a smoother transfer of torque, helping to protect gears, splines and other drivetrain parts from sudden impact loads.

• Soft-rubber design reduces shift noise by roughly 22–23%
• Dampens vibration and minimizes propeller-induced rattle
• Absorbs impact loads to protect internal drivetrain components
• Maintains dependable engagement for general-purpose propeller use

What’s included in the kit and how simple is installation?

The kit ships with the thrust washer, SSR drive sleeve, drive sleeve adapter, tabbed lock washer and locking prop nut—everything needed to replace the hub internals. Installation is straightforward with common shop tools or Quicksilver specialty tools like the floating prop wrench and Prop Block, letting most technicians complete the swap quickly.

• Complete internal hub component set for a full replacement
• Compatible with standard boatshop tools or Quicksilver tools
• Quick swap process when following factory torque and alignment steps
• Replacement restores fitment for existing Flo-Torq interchangeable props

When should I choose a different SSR hub option?

For larger prop shafts, high-performance surface-piercing setups, or heavier-duty applications, Quicksilver offers other SSR variants built for increased loads. Select the SSR Solid or SSR HD kits when your engine model or shaft diameter exceeds the 1" specification or when your application requires reinforced internal components.

• Use SSR Solid 8M0101604 for some 40–225hp high-performance/surface-piercing cases
• Choose SSR HD 8M0101603 for 200–400hp engines with 1.25" shafts
• Confirm engine hp and shaft diameter before selecting alternate kits
• Contact an authorized dealer for compatibility guidance

Who is this for: Boaters, professional mechanics and marine service centers seeking a reliable hub upgrade or direct replacement for Flo-Torq II/III/IV applications on Mercury outboards will value the Quicksilver 8M0150152 SSR kit. It’s ideal for owners who want quieter shifts, reduced propeller rattle and added driveline protection for everyday cruising, tow sports, and general-purpose propeller use on compatible 1" shaft Mercury engines.