The OZ-21 hub kit fits interchangeable square Flo-Torque style hub cavity propellers, stainless or aluminium, including OZ interchangeable and aluminium propellers. It suits Mercury, Mariner and MerCruiser Alpha One / Bravo One 40-400hp. The rubber bush absorbs gear shift shock and protects the gearbox, and the brass spline insert locks to your prop shaft.
Suits Mercury / Mariner / Force Outboards, 15 spline, 4¼″ gear case (D class)
- 40/50hp (4-stroke / Bigfoot) – all years
- 60hp (4-stroke / Bigfoot) – 1995 & newer
- 70hp – 1987 to 1989
- 75hp (2 & 4-stroke) – 1984 & newer
- 80hp – 1978 to 1989
- 90hp (2 & 4-stroke) – 1978 & newer
- 100hp – 1988 & newer
- 115hp (2 & 4-stroke) – 1978 & newer
- 125hp – 1994 & newer
- 140hp (incl. Sea Pro / Offshore) – 1978 to 1981
- Mariner 80hp – 1978 to 1983
- 80hp (Yamaha-badged) – 1977 to 1983
- Force 75hp – 1999 & newer
- Force 90 / 120 / 150hp – 1995 & newer
- Sea Pro / Marathon 60hp – 1995 & newer
- Sea Pro / Marathon 75hp – all years
- Model 650 (4 cyl) – 1961 to 1970
- Model 650 (2 cyl) – up to 1971
- Models 800 and 850 (2 and 4 cyl) – up to 1977
- Models 900 to 1500 – up to 1977
Suits Mercury / Mariner Outboards, 15 spline, 4¾″ gear case (E class)
- 90 / 100 / 115hp Command Thrust – 2014 & newer
- 135hp – 1987 & newer
- 150hp – 1978 & newer
- 175hp – 1978 & newer
- 200hp – 1978 & newer
- 220hp – 1987 to 1988
- 225hp – 1980 & newer
- 225hp Sea Pro / Marathon – all years
- 250 to 400hp (2 & 4-stroke) – 1990 & newer
- 3.4 litre – 1984 to 1986
Suits MerCruiser Sterndrives, 15 spline, 4¾″ gear case
- Alpha One and Bravo One legs
Not sure which kit you need? Tell us your engine make, horsepower and year, plus the propeller you are running. We will confirm the right hub kit before it ships. Fitment is a guide only.

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