Mercury Black Max Propeller 10.6 x 12 | 73134A45

Mercury Black Max Propeller 10.6 x 12 — Part #73134A45

The Mercury Black Max 73134A45 is a genuine OEM 3-blade aluminum propeller sized at 10.6" diameter and 12" pitch, designed for Mercury and Mariner outboards in the 25–60 HP range. Built from Mercalloy aluminum with a Phantom Black corrosion-resistant finish, the Black Max line delivers dependable everyday performance for fishing boats, small runabouts, and outboard-powered utility craft. This propeller includes a Flo-Torq Reflex hub kit (835257K12) in the box — ready to install.

Part Details

• Part Number: 73134A45 (full Mercury number: 48-73134A45)
• Brand: Mercury Marine
• Series: Black Max
• Product Type: 3-Blade Aluminum Outboard Propeller
• Diameter: 10.6 in. (10-5/8 in.)
• Pitch: 12 in.
• Blades: 3
• Material: Mercalloy Aluminum
• Rotation: Right-hand (standard)
• Finish: Phantom Black
• GTIN: 745061018341

Compatible Applications

• Mercury / Mariner 25–30 HP FourStroke BigFoot / Command Thrust outboards
• Mercury 30 HP TwoStroke outboards
• Mercury 30 HP FourStroke, 2005 and earlier
• Mercury / Mariner 40–60 HP outboards
• Selected Mercury SeaPro and Marathon models within the same gearcase family
• Fitment note: Always confirm engine model, gearcase, propeller-shaft configuration, and your current propeller size before ordering. Correct pitch also depends on boat weight, load, hull type, and your engine's recommended wide-open-throttle RPM range.

Kit Contents

• Mercury Black Max 73134A45 propeller
• Flo-Torq Reflex hub kit 835257K12 (included)

Dimensions

• Diameter: 10.6 in. (10-5/8 in.)
• Pitch: 12 in.
• Approximate weight: 2.2 lbs

System

Outboard propulsion — propeller and hub assembly for Mercury / Mariner lower gearcase applications in the 25–60 HP class.

When to Replace Your Propeller

Replace the propeller if blades are bent, cracked, heavily nicked, or distorted, or if hub damage or excessive vibration is present. Propeller damage can affect acceleration, engine RPM, fuel economy, and gearcase loading.

Installation Notes

• Inspect the propeller shaft, splines, thrust washer, hub components, and propeller nut hardware before installation
• Apply the specified marine lubricant to the shaft as required
• Torque the propeller nut according to the applicable Mercury service procedure
• The included Flo-Torq Reflex hub kit must be correctly assembled — follow Mercury's hub installation instructions

Service Interval

Inspect the propeller and hub assembly at every season start and after any impact event (striking debris, running aground). Replace the thrust washer and check hub integrity any time the propeller is removed for service.

Related Parts & Accessories

• Mercury Quicksilver Flo-Torq II Hub Kit 835257K6 — compatible hub kit for other gearcase configurations
• Mercury Quicksilver Flo-Torq II Hub Kit 835257K1 — Flo-Torq II hub for smaller outboard applications
• Mercury Black Max Propeller 10.4 x 14 — 816706A45 — same family, higher pitch option
• Mercury Black Max Propeller 9 x 9 — 828156A12 — smaller diameter/pitch for lighter applications
• Browse all Propellers — Aluminum, Stainless & Folding
• Propeller Hardware — Nuts, Washers, Hubs & Cones

Technical FAQ

• Does this propeller include a hub kit? Yes — the Flo-Torq Reflex hub kit (835257K12) is included in the box.
• What is the correct propeller pitch for my engine? Pitch selection depends on your engine's recommended WOT RPM range, boat weight, load, and hull type. A qualified marine dealer can help determine the right pitch if you're unsure.
• Is right-hand rotation correct for my outboard? Most single-engine outboard installations use right-hand rotation. Confirm your current propeller's rotation direction before ordering.
• Can I use this on a counter-rotating twin setup? No — 73134A45 is right-hand rotation only and is not suitable for counter-rotation applications.
• What if my boat feels sluggish after fitting a 12-pitch prop? If WOT RPM drops below the engine's specified range, pitch may be too high for your load. Consider a 10 or 11-pitch in the same diameter family.

Parts Desk Insights

The 73134A45 is one of our most ordered small-outboard propellers — it's the go-to replacement for anglers running 25–60 HP Mercury or Mariner motors on aluminum fishing boats and jon boats in the 14–18 ft range. The most common issue we see is customers ordering by engine HP alone without checking their current propeller's diameter and pitch. Always cross-reference the 10.6" diameter and 12" pitch against your existing prop before purchasing. If your engine is consistently over-revving at WOT, a step up in pitch is worth considering — we'd suggest looking at the 10.4 x 14 in the same Black Max family.