77342A45 BLMX Diameter 13 3/4 Pitch 15 Blades 3 Rotation Right Mercury Black Max Fits MERCURY/MARINER 40 BIGFOOT/COMMAND THRUST – 125 HP and 40-60 HP BigFoot / Command Thrust (CT) All Years 75-125 HP 1978 & Newer using 15 Tooth Spline.

Mercury Marine Black Max (BLMX) 3-Blade Propellers are durable, high performing prop s that fit a wide range of Mercury/Mariner outboards and MerCruiser sterndrives.

Mercalloy: PatentedPerformance

We couldn’t find an aluminum alloy good enough for our propellers. So we invented one: Mercalloy Aluminum. So unique its patented, Mercalloy makes for higher-strength castings. Which allows for thinner blades that create less drag. Result? Optimal performance, optimal durability, betterboating.