48-77344 48-77344A45 Mercury Black Max 13 1/4 x 17 Aluminium Propeller – RH 15 Spline | Genuine Used Part

🔧 Product Description

Genuine Mercury Black Max 13 1/4 x 17 Aluminium Propeller - Part Number: 48-77344 / 48-77344A45

A genuine used Mercury Black Max three-blade right-hand aluminium propeller for 40HP-60HP BigFoot / Command Thrust and 75HP-125HP Mercury or Mariner outboards.

The supplied 12-inch description is incorrect for this part family. The catalogued service propeller is 13 1/4 inches in diameter with 17 inches of pitch and uses the 15-tooth 4 1/4-inch gearcase.

⚙️ Key Features

• Genuine Mercury / Quicksilver Black Max propeller
• Correct size: 13 1/4-inch diameter x 17-inch pitch
• Three-blade aluminium construction
• Right-hand rotation with 15-tooth shaft application
• Later A45 service version uses a replaceable Flo-Torq hub system

🚤 Compatibility

Commonly used on

• Mercury and Mariner 4 1/4-inch gearcases with 15-tooth propeller shafts
• General-purpose 17-pitch applications for planing recreational hulls

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 engine torque into thrust. Its 17-inch pitch is commonly used for an all-round balance of acceleration, cruising speed and wide-open-throttle engine RPM.

⚠️ 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

• 48-77344A45 → Replaces 48-77344A40, 48-77344A4 and 48-77344

OEM / Related Numbers

• 48-77344
• 48-77344A4
• 48-77344A40
• 48-77344A45
• 835257K9 recommended Flo-Torq III hub kit for designated BigFoot and OptiMax applications

Aftermarket / Verified Equivalents

• Michigan Wheel Match: 031042 - 13 1/4 x 17 aluminium equivalent
• VEVOR / Misakomo direct 13 1/4 x 17 aluminium replacements for 48-77344A45
• Solas Amita 3 / Rubex 3 - 17-pitch aluminium alternatives with the correct Mercury 15-spline hub
• Michigan Wheel Rapture - 13 1/4 x 17 stainless-steel performance alternative

📦 Condition

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