48-77338A40 48-77338A45 Mercury Black Max 14 x 11 Aluminium Propeller – RH 15 Spline | Genuine Used Part

🔧 Product Description

Genuine Mercury Black Max 14 x 11 Aluminium Propeller - Part Number: 48-77338A40 / 48-77338A45

A genuine used Mercury Black Max three-blade right-hand aluminium propeller for Mercury and Mariner 4 1/4-inch gearcases using the 15-tooth propeller shaft.

The low 11-inch pitch and large 14-inch diameter provide strong acceleration and load carrying for pontoons, workboats and heavily loaded boats. Later A45 service propellers use the replaceable Flo-Torq hub system.

⚙️ Key Features

• Genuine Mercury / Quicksilver Black Max propeller
• 14-inch diameter x 11-inch pitch
• Three-blade aluminium construction
• Right-hand rotation with 15-tooth shaft application
• Low-pitch design for heavy loads and strong planing performance

🚤 Compatibility

Commonly used on

• Mercury and Mariner 4 1/4-inch gearcases with 15-tooth propeller shafts
• Heavy-load, pontoon and workboat applications requiring 11 inches of pitch

Typically suits

• Engine models:
• Mercury / Mariner 40HP, 50HP and 60HP BigFoot / Command Thrust using the 4 1/4-inch gearcase
• Mercury / Mariner 60HP SeaPro / Marathon with the compatible 15-spline gearcase
• Mercury / Mariner 65HP four-cylinder - approximately 1961-1970
• Mercury / Mariner 75HP two-stroke - approximately 1984-2005
• Mercury / Mariner 75HP four-stroke - approximately 2001 onward
• Mercury / Mariner 80HP - approximately 1978-1989
• Mercury / Mariner 85HP / model 850 - through approximately 1977
• Mercury / Mariner 90HP - approximately 1978 onward
• Mercury / Mariner 100HP - approximately 1988 onward
• Mercury / Mariner 115HP - approximately 1978 onward
• Mercury / Mariner 125HP - approximately 1994 onward
• Mercury 140HP - approximately 1978-1981 where the 4 1/4-inch gearcase is fitted
• HP Range: 40HP Command Thrust - 140HP, gearcase controlled
• Engine Type: Mercury / Mariner two-stroke or four-stroke outboard with 4 1/4-inch 15-spline gearcase
• Year Range: Approximately 1960s onward, model and gearcase controlled

🔌 Function

The propeller converts engine torque into thrust. Its 11-inch pitch helps heavily loaded boats plane and allows the engine to regain RPM where a higher-pitch propeller causes lugging.

⚠️ Common Signs of Failure

• Blades are bent, chipped, cracked or out of track
• The hub slips and engine RPM rises without matching boat speed
• Propeller vibration increases with engine speed
• Cavitation, ventilation or poor acceleration develops after impact damage
• Hub splines, thrust faces or retaining surfaces are worn or corroded

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 48-77338A45 → Supersedes 48-77338ARA
• 48-77338ARA → Supersedes 48-77338A40
• 48-77338A40 → Supersedes 48-77338A4
• 48-77338A4 → Replaces earlier 48-30396A1, 48-58826A3, 48-32392A3, 48-35936A3 and 48-30396A3

OEM / Related Numbers

• 48-77338A40
• 48-77338ARA
• 48-77338A45
• 48-77338A4
• 48-30396A1
• 48-58826A3
• 48-32392A3
• 48-35936A3
• 48-30396A3
• 835257K9 related Flo-Torq III hub kit for designated applications

Aftermarket / Verified Equivalents

• Quicksilver Black Diamond: QA2030X - 14 x 11 aluminium equivalent
• Polastorm / Osculati: 52.447.03 - 14 x 11 aluminium replacement
• Michigan Wheel Match / Vortex: 14 x 11 aluminium modular-hub alternative
• Solas Amita 3 / Rubex 3: 11-pitch aluminium alternative with the correct Mercury hub

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated