20 HP Mercury Outboard Boat Propellers 4-Stroke, Mariner 2007 & Newer
 You Are Viewing Available Prop Pitches For:
Manufacturer: Mercury Horsepower: 20 HP Years: 2007 & Newer Model: 4-Stroke, Mariner Outboard Specs: Thru Hub Exhaust & 14 Tooth Spline Max RPM: Not Available
Where to Find Your Prop Pitch
Prop Pitch & RPM's
  
It is critical that your engine operates within the manufacturer-recommended RPM range.
- 2” Pitch will add 400 RPM + 2” Pitch will subtract 400 RPM These changes vary and may not reflect actual change in engine RPM & performance for your specific prop & engine.X - Close
Please Choose A Propeller Pitch:
Your Engine
Propeller Pitch
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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) |
Pitch is stamped on the outer prop hub...
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...oraround the inner hub. |
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 Basics
How To Choose A Prop Diameter Pitch Cupping Rake Ventilation Cavitation We tell you everything you need to know about props from cupping to ventilation. |
Prop Characteristics
3 Blades VS. 4 Splines Aluminum vs. Stainless Steel Performance Exhaust Left-Handed Props FAQ If you want to modify your boat's performance, consider the above before making your selection. |
Determining RPM's
Effect of pitch on RPM Test for Maximum RPM For safety and efficient performance, it is critical that your engine operates within the RPM range recommended by the manufacturer. |
