48-77346-C1 48-77346A45 Mercury Black Max 13 x 19 Aluminium Propeller – RH 15 Spline | Genuine Used Part

🔧 Product Description

Genuine Mercury Black Max 13 x 19 Aluminium Propeller - Part Number: 48-77346-C1 / 48-77346A45

A genuine used Mercury Black Max three-blade right-hand aluminium propeller for 40HP-60HP BigFoot / Command Thrust and 75HP-125HP outboards with the 15-spline 4 1/4-inch gearcase.

Identification 48-77346-C1 is associated with the casting family; the complete service propeller is catalogued as 48-77346A45. The 19-inch pitch is generally suited to lighter or faster boats that can carry more pitch while maintaining the specified engine RPM.

⚙️ Key Features

• Genuine Mercury / Quicksilver Black Max propeller
• 13-inch diameter x 19-inch pitch
• Three-blade aluminium construction
• Right-hand rotation with 15-tooth shaft application
• Service assembly reference 48-77346A45

🚤 Compatibility

Commonly used on

• Mercury and Mariner 4 1/4-inch gearcases with 15-tooth propeller shafts
• Higher-pitch recreational applications where the engine can carry 19 inches of pitch

Typically suits

• Engine models:
• Mercury / Mariner 40HP, 50HP and 60HP BigFoot / Command Thrust - all production years using the 4 1/4-inch gearcase
• Mercury / Mariner 70HP applications using the compatible 15-spline gearcase
• Mercury / Mariner 75HP and 80HP - 1978 onward
• Mercury / Mariner 90HP two-stroke, four-stroke and OptiMax with the 4 1/4-inch gearcase
• Mercury / Mariner 100HP and 115HP with the compatible 15-spline gearcase
• Mercury / Mariner 125HP two-stroke
• Mercury 75HP-115HP OptiMax where the recommended Flo-Torq III or equivalent hub system is fitted
• Fitment is controlled by the 4 1/4-inch gearcase, 15-tooth shaft, propeller clearance and wide-open-throttle RPM
• HP Range: 40HP Command Thrust - 125HP
• Engine Type: Mercury / Mariner two-stroke and four-stroke outboard with 4 1/4-inch 15-spline gearcase
• Year Range: Approximately 1978 onward

🔌 Function

The propeller converts torque into forward thrust. Compared with a lower-pitch propeller, 19 inches of pitch can reduce engine RPM and increase potential cruising or top speed when the hull and load are suitable.

⚠️ Common Signs of Failure

• Blades are bent, chipped, cracked or out of track
• The rubber 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

• 48-77346A45 → Replaces 48-77346A40 and 48-77346A4
• 48-77346-C1 casting / identification reference

OEM / Related Numbers

• 48-77346-C1
• 48-77346
• 48-77346A4
• 48-77346A40
• 48-77346A45
• 835257K9 recommended Flo-Torq III hub kit for designated applications

Aftermarket / Verified Equivalents

• Michigan Wheel Match: 031043 - 13 x 19 aluminium equivalent
• Michigan Wheel: 992106-102 related modular-hub replacement
• BS.PRO / Captain direct 13 x 19 aluminium replacements for 48-77346A45
• Solas Amita 3 / Rubex 3 - 19-pitch aluminium alternatives with the correct Mercury hub

📦 Condition

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