It is supposed to be solid stainless, maybe better than the old fat shaft hub. I have heard of a couple of the old ones breaking.
Product Description
“The Next Generation” of Flo-Torq
Mercury® introduces their newest Flo-Torq hub system.
-The Flo-Torq SSR HD is the quietest and smoothest shifting propeller hub system on the market for high horse-powered outboards
-The Flo-Torq SSR HD delivers 10-19% shift clunk improvement vs. solid hub designs.
-The Flo-Torq SSR HD is an ultra durable solid stainless steel design featuring a bonded rubber drive sleeve. The bonded rubber sleeve allows the propeller to rotate around the solid hub absorbing shift clunk and vibration.
-The Flo-Torq SSR HD has the same geometry of the Mercury’s Flo-Torq II hub system and can be used with all current Mercury propellers.
When using JoyStick Piloting and/or shifting into gear, the Flo-Torq SSR HD rotates port and starboard eliminating shift clunk and vibration, resulting in quiet and smooth shifting.
Once under load, the hub will engage the propeller inner hub, resulting in a solid hub with the ability to transfer the power of 350-400 horsepower Mercury and Mercury Racing’s Verado engines
The most advanced modular hub design ever created
-The Flo-Torq SSR HD is NOT a rubber hub
-The Flo-Torq SSR HD is a modular hub design like all other Mercury Flo-Torq II systems, resulting in it being field serviceable.
Boat Type: All High Horsepower applications
-Center Console, Bass Multi-species, Bay/Flats, Deck, Tri/Pontoon, RIB, Sport
Engine Fitment: Engines with 1.25″ prop shaft
-Verado Six Cylinder 300hp and 350hp
-Verado 400R
-Pro XS 225hp and 250hp