Propeller and Shaft Repair

Kahlenberg repairs and tunes propellers to ISO 484-2 Standards. These measurement standards, developed by the International Standards Organization, are used to determine how accurately the propeller is manufactured or repaired.

ISO 484-2 separates propellers into four classes.

These classes can be summarized as follows:

Class S____Best, Very High Tolerance
Class I_____Very Good, High Tolerance
Class II____Average Tolerance
Class III____Low Tolerance

It is important to consider that most new propellers only meet Class II or Class III tolerances.

Propellers tuned to Class I and Class S pitch tolerances will improve performance, fuel efficiency, and provide smoother operation. Properly tuned propellers also reduce stress and wear on engines and bearings.

Kahlenberg repairs propellers of bronze, NIBRAL (Nickel Aluminum Bronze), and stainless steel to Class II, Class I or Class S pitch tolerances. Propeller diameters from 12 inches up to approximately 120 inches in diameter can be accomodated. The Hale MRI system measures propellers up to 54" in diameter. Larger sizes are measured manually with pitchometers manufactured by Kahlenberg.

Detailed propeller condition reports are supplied for each customer order including initial propeller measurements and measurements after repairs are completed.

For propeller sizing, please complete and submit this form to our Engineering Department:  Vessel Data Form