Mercury / Quicksilver Black Max 832832A45 | 14.25 × 21 RH 3-Blade Aluminum Propeller | Alpha One / Bravo One

Part Details

• Part Number: 832832A45 / 48-832832A45
• Brand: Mercury Marine / Quicksilver (Genuine OEM)
• Official Product Type: Black Max 3-Blade Aluminum Propeller
• Diameter: 14.25 in. / 362 mm
• Pitch: 21 in. / 533 mm
• Blades: 3
• Material: Aluminum
• Rotation: Right-hand (standard)
• Finish: Phantom Black high-gloss
• Hub System: Mercury Flo-Torq II
• Includes: Flo-Torq II Hub Kit 835257K1
• Gearcase: 15-spline, 4-3/4 in.
• GTIN: 745061019157
• Weight (approx.): 3.2 kg / 7.0 lb

What This Propeller Is

Mercury / Quicksilver 832832A45 is a genuine Black Max 3-blade aluminum propeller in 14.25 in. × 21 in. pitch, right-hand rotation. The Black Max series is Mercury’s standard performance aluminum propeller line, designed for broad compatibility across Mercury and Mariner outboards and MerCruiser sterndrives using the 15-spline 4-3/4 in. gearcase family. The propeller is supplied complete with the Flo-Torq II Hub Kit 835257K1.

Compatible Applications

Fitment is confirmed by engine or drive model, gearcase size, spline count, rotation, and wide-open-throttle RPM performance. Documented Mercury applications include:

• MerCruiser Alpha One sterndrives
• MerCruiser Bravo One sterndrives
• Mercury / Mariner 135–350 HP outboards (model and year dependent)
• Mercury 90–115 HP FourStroke Command Thrust, 2014 and newer
• Mercury OptiMax outboards using applicable 15-spline, 4-3/4 in. gearcase
• Mercury Verado outboards using applicable 15-spline, 4-3/4 in. gearcase
• Mercury conventional TwoStroke and FourStroke outboards using the 15-spline, 4-3/4 in. gearcase

With a compatible Flo-Torq hub kit, this propeller can also be adapted to selected Yamaha, Suzuki, Honda, and OMC/Evinrude applications — confirm the correct hub kit for those applications before ordering.

Specialized installations such as Bravo One XR/XZ, 350 Verado SCI, or higher-horsepower setups may require a different Flo-Torq hub kit or solid-hub arrangement. Confirm with Mercury documentation for those applications.

Pitch Selection Note

A 21-pitch propeller is optimized for higher top-end speed on lightly loaded, higher-horsepower applications. Compared to a 17- or 19-pitch propeller, a 21-pitch will load the engine more and produce lower RPM at wide-open throttle. Final propeller selection should keep the engine within Mercury’s specified full-throttle RPM range for the installed engine — if the engine cannot reach its specified RPM range, dropping to a lower pitch will improve performance and protect the engine.

When to Replace

Replace or have the propeller repaired if inspection shows:

• Bent, cracked, or broken blades
• Significant leading- or trailing-edge damage
• Severe corrosion or material loss
• Hub damage or excessive hub movement
• Persistent vibration after an impact or grounding
• Loss of acceleration or top-end performance following a strike
• Blade distortion that cannot be corrected by professional repair

Even minor blade damage can create vibration that loads the propeller shaft, bearings, and gearcase. Inspect the propeller after any impact.

Installation Notes

• Confirm right-hand rotation matches the installed engine or drive before fitting
• Verify the Flo-Torq II Hub Kit 835257K1 is appropriate for the specific engine or drive application
• Inspect the propeller shaft for fishing line, corrosion, or wear before installation
• Check the thrust washer and retaining hardware — see Thrust Washer 835467Q01
• Apply the specified marine grease to the propeller shaft splines
• Install and torque the propeller nut to the specification in the applicable Mercury service procedure
• After installation, recheck wide-open-throttle engine RPM to confirm the engine is operating within the manufacturer’s specified range

Cross-Reference Part Numbers

• Mercury / Quicksilver OEM: 832832A45 / 48-832832A45 / 48832832A45
• Michigan Wheel aftermarket: 992005-102, 992004-102, 33078, 33076, 31066, 31038, 31037, 31026, 31025
• GTIN: 745061019157

Related Parts

• Mercury Quicksilver Flo-Torq II Hub Kit 835257K1 — included with this propeller; replacement hub kit
• Mercury Quicksilver Thrust Washer 835467Q01
• Mercury Black Max 14 × 23 Propeller 832834A45 — higher-pitch sibling
• Mercury Black Max 14.5 × 19 Propeller 832830A45 — lower-pitch option
• Mercury Black Max 15 × 17 Propeller 832828A45 — lower-pitch option
• Browse MerCruiser Marine Engine Parts for all propeller and drive components

Technical FAQ

Does this propeller fit my Alpha One sterndrive?
Yes, 832832A45 is documented for MerCruiser Alpha One sterndrives using the 15-spline 4-3/4 in. gearcase. Confirm the spline count and gearcase diameter match before installing.

Does this propeller fit my Bravo One sterndrive?
Yes, it is also documented for Bravo One sterndrives. Bravo One XR/XZ or specialized high-horsepower Bravo applications may require a different hub kit — confirm with Mercury documentation for those configurations.

What hub kit is included?
The Flo-Torq II Hub Kit 835257K1 is included. This is the standard hub for most Mercury and Mariner outboard applications using the 15-spline 4-3/4 in. gearcase. Some applications require a different hub kit.

My engine won’t reach its specified RPM range with this propeller — what should I do?
A 21-pitch propeller is a relatively high pitch and may over-load some engines, particularly on heavier boats or at lower speeds. If the engine cannot reach its specified wide-open-throttle RPM, moving to a lower pitch (such as 19 in.) will reduce load and allow the engine to operate in its correct power range.

Parts Desk Insights

Best use case: 832832A45 is best suited for lighter-hulled boats running higher-horsepower Mercury or MerCruiser Alpha One / Bravo One setups where top-end speed is the priority. The 21-pitch is a popular choice for center-console and performance applications that can handle the additional pitch load at wide-open throttle.

Common issue: The most frequent mistake is ordering by part number or pitch without verifying that the engine can actually reach its specified wide-open-throttle RPM range with a 21-pitch propeller installed. A 21-pitch Black Max is a significantly heavier load than a 17- or 19-pitch version. If the existing propeller is already a 21 and the engine is borderline on RPM, inspect the hub for slippage before ordering a replacement — a worn Flo-Torq hub can mask a pitch problem and make the engine appear to be under-pitched.