PolaFlex hub Kit for High Power Mercury & MerCruiser applications with 1.25-inch-diameter prop shaft and 19 splines

This PolaFlex F51 hub kit is engineered for V8-powered 250-300hp Mercury Verado outboards alongside 175-300 hp Pro XS Torque Master II gearcases. Built specifically for high-speed setups, it features a heavy-duty 1.25-inch-diameter prop shaft with 19 splines. Primary Applications: Mercury Verado & Pro XS V8 Outboards Mercruiser X/R & X/Z Sterndrives It is intended for setups utilizing an HD 1.25" prop shaft when paired with Fleet Master and Verado 5.25" gearcases, Sport Master, or Torque Master I and II units (specifically Torque Master gearcases configured to fit 200XS, 225X, 2.5 EFI, 225 Pro X, 250XS, and 300X). Additionally, it fits MerCruiser Bravo One XR or XZ systems, Sport Master and shorty Sport Master Bravo 1 XR Sport sterndrives, as well as Mercury Racing Sport components. Compatible with: RUBEX RBX 123 Flo-Torq SSR HD Kit (8M0101603)