Propeller Identification

Most marine propellers have identification markings stamped or etched onto the propeller hub. Understanding what these markings mean will help you to figure out what propeller you have.This is very important information to keep in your records. If you need to replace your propeller or have it repaired, knowing the dimensions and the model will reduce the chances of errors.

These markings can include some, or all of the following information:

  • Make
    This would be the manufacturer's name.
    It could be a name stamp, or logo stamp.
  • Model
    This would be a name that indicates the style or design of the propeller determined by the manufacturer.
  • Part Number
    This would be a number used to identify the propeller from a catalogue listing.
    (Most outboard and stern drive propellers use part numbers)
  • Serial Number
    This would be a unique number that would identify this specific propeller.
    Generally the manufacturer will keep detailed information about the propeller in a serial number file.
  • Dimensions
    These are normally shown as diameter X pitch.
    The first number indicates the overall diameter of the propeller in inches or millimeters.
    The second number indicates the pitch in inches or millimeters.
    They can be separated by an "X" or letters indicating the rotation like RH or LH.
  • Rotation
    This indicates the propeller rotation. It can be a simple "L" or "R".
    It is super important to note the rotation, especially when removing and installing twin propellers.
  • Manufacturing Date
    Indicates the date of manufacture of the propeller.
  • Material
    This indicates the metal that the propeller is made from.
    There are many acronyms and designations for different materials.