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You Are Viewing Available Prop Pitches For:
- Manufacturer: Mercury
- Horsepower: 85 HP
- Years: Thru 1977
- Model: Model 850, 2 & 4-Cyl. Outboard
- Specs: Thru Hub Exhaust & 15 Tooth Spline
- Max RPM: Not Available
Choose a Propeller Pitch
Important! Choose the correct pitch for your application. Used props are non-returnable.
Read More About Picking Your Pitch
Please Choose A Propeller Pitch:
Propeller Pitch
Where to Find Your Prop Pitch
Pitch is stamped on the outer prop hub..
Look on the outer hub of the prop near the blades or inside the hub.
Most props are stamped with a series of numbers.
Pitch is always the last number listed.
Example: 3 x 16 x 24.5R
3 - Number of Blades (occasionally displayed)
16 - Diameter
24.5 - Pitch
R - Direction of Rotation (R = Right/Standard, L = Left/Counter)
Prop Pitch & RPM's
For safety, and efficient performance, it is critical that your engine operates within the RPM range recommended by the manufacturer.
A change in the prop pitch will increase or decrease the engine RPM's and can be used to bring them into the recommended range. A 2' pitch increase (for example, from 21' to 23') will result in approximately a 300-400 RPM decrease and vice versa.
The correct prop allows the engine's RPM to run within the top end of the manufacturers recommendation.
Propeller Help Guide
Propeller Basicss
Free naruto episodes english dubbed. We tell you everything you need to know about props from cupping to ventilation.
Prop Characteristics
If you want to modify your boat's performance, consider the above before making your selection.
Mercury 850 Parts
Determining RPM's
1977 Mercury 850 Manual
For safety and efficient performance, it is critical that your engine operates within the RPM range recommended by the manufacturer.