Quicksilver Flo-Torq SSR HD Propeller Hub Kit for Mercury 200–400 hp FourStroke — 1.25" Shaft, Noise‑Reducing Rubber Insert

The Quicksilver Flo-Torq SSR HD Propeller Hub Kit 8M0101603 is a direct-fit replacement hub that reduces shift noise and vibration for Mercury 200–400 hp FourStroke outboards with a 1.25" prop shaft.

This heavy-duty Flo-Torq SSR (Soft-Shift Rubber) hub kit is engineered to smooth the transfer of torque from the lower unit to the propeller, cutting down loud shift clunks and prop rattle. Designed as a genuine Quicksilver/Mercury OE replacement, the kit simplifies service with all required hardware included and works with most 200–400 hp FourStroke engines that accept a 1.25" propeller shaft. If your engine’s serial number is below a specific threshold, a dealer update may be required before installation.

How does this hub reduce shifting noise and vibration?

The SSR hub uses a resilient rubber insert and a solid drive sleeve to absorb shock during gear engagement, lowering the abruptness of shift events. That cushioning reduces mechanical noise and dampens torsional vibration transmitted to the propeller and hull.

• Soft-Shift rubber design minimizes shift clunk and driveline shock
• 22–23% measured reduction in shift-event noise compared to rigid hubs
• Solid drive sleeve maintains torque transfer while isolating harsh feedback

What parts are included and how simple is the installation?

Each kit ships complete with the SSR drive sleeve and a matched set of washers and fasteners so you won’t need extra parts for a standard replacement. Installation is straightforward for anyone familiar with lower unit work and can be done with common tools or Quicksilver accessories like the floating prop wrench and prop block.

• Included: SSR drive sleeve, three-washer set, tabbed lock washer, locking prop nut
• Compatible with typical shop tools; Quicksilver prop tools speed the job
• Follow Mercury service advisories for engines with early serial numbers

Which engines and shaft sizes is this kit designed for?

This Flo-Torq SSR HD kit is specifically sized for Mercury FourStroke outboards rated 200–400 horsepower using a 1.25" diameter propeller shaft. Quicksilver offers alternate SSR kits for other horsepower ranges and 1.00" shafts—verify fitment before ordering to ensure correct application.

• Fits Mercury FourStroke 200–400 hp engines with 1.25" prop shafts
• Do not substitute for 1.00" shaft applications—use the correct SSR kit
• High-performance and surface-piercing setups may require different part numbers

Who is this for: Boaters and technicians who want a factory-quality hub replacement that quiets shift noise and improves propeller engagement on mid- to high-horsepower Mercury FourStroke outboards. Ideal for operators who value smooth shifting, reduced vibration, and an OEM-fit solution from Quicksilver.