Mercury Marine 48-78120A40 Stainless Steel Boat Propeller Application Guide
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- Manufacturer: Mercury Marine
- Prop Family: All Other Mercury Marine Props
- Part Number: #48-78120A40
- Rotation: Standard Rotation
- Diameter: 14”
- Pitch: 19”
#48-78120A40 Not In Stock - Choose your engine to see equivalent props
Prop Exhaust Types
Thru-hub has holes around the prop hub.
Thru-hub ExhaustMost outboard & stern drive engines vent exhaust thru the prop hub.
You have a thru-hub exhaust if there are exhaust holes on the engine gearcase around the prop shaft.
Non thru-hub is solid around the prop hub.
Non Thru-hub ExhaustNon thru-hub exhaust systems are found mostly on low horsepower motors.
You have a non thru-hub exhaust if there are NO exhaust holes on the engine gearcase around the prop shaft.
Prop splines are the little teeth you see on your prop shaft and inside the prop hub.
The number of splines on the shaft and inside the prop must match for the prop to fit your boat.
A Pin Drive prop application has no splines. The prop is secured to a smooth prop shaft with a pin through the shaft.