Propeller Blade Seal Positioning Gauge



The Propeller Blade Seal Positioning Gauge is a tool that assists with marking the correct location for installation of Teflon strips on a propeller blade shank.

The Propeller Blade Seal Positioning Gauge is made from Teflon or non-pliable plastic, has no moving parts, and can easily be modified for other aircraft, military or civilian, or marine craft which use propeller-driven or turbo-prop power plants.




Special features

  • Saves time in marking locations for seals on propeller blade shank
  • No need to use calipers
  • Accurate positioning
  • Eliminates guesswork
  • No moving parts
  • Created for military and civilian use
  • Easily modified for different aircraft and marine vessels with propellers
  • Made of Teflon or non-pliable plastic
  • Will not damage propeller shank
  • One tool-multiple applications
  • Works for left- or right-handed mechanics
  • Low cost to manufacture




The Propeller Blade Seal Positioning Gauge is a precision tool used for the accurate location of seal installation on propeller blade shanks. The Propeller Blade Seal Positioning Gauge comprises an elongate arm having a propeller blade butt stop or catch extending from one end normal to the adjacent portion of the arm. The arm is curved for clearance of the flange that extends radially from the butt of the propeller blade. At least one marker guide notch or inset is formed in at least one edge of the distal portion of the arm. The inset is adapted to receive the point or tip of a marking device, such as a china marker or grease pencil. The longitudinal position of the inset from the hook or catch of the guide is determined precisely according to the proper location or position of the seal to be installed about the propeller shank.

The gauge is used by placing the stop or catch upon the butt end of the propeller blade so that the arm extends along the adjacent shank of the blade and in close contact therewith. The tip of the marking device is then placed in the appropriate notch, as required, and the gauge is rotated about the spanwise axis of the blade. The marking device follows in its inset guide notch of the gauge, thereby producing a circumferential line at precisely the proper location to indicate the position for installing the seal about the propeller shank.

The gauge is constructed specifically for a certain make and model of propeller blade, as each propeller make and model will require the blade shank seals to be positioned differently from other propeller types. Most larger propellers require two or more seals about the shank of each blade, and the gauge may be formed with such multiple notches as may be required, depending upon the propeller type. The notches may be formed along both of the opposed edges of the distal portion of the arm of the gauge to allow the gauge to be rotated in either direction about the butt of the blade, depending upon the desires of the technician performing the operation, i.e., whether the technician is left-handed or right-handed. Alternatively, opposite edges of the distal portion of the gauge may be provided with different notch spacing to provide for seal marking on two different makes and models of propellers, if desired.

The one-piece seal gauge has no moving parts. Constructed from a single strip of Teflon or non-pliable plastic, it will not cause damage to the shank and is notched for perfect placement markings.

This simple tool saves hours of maintenance time spent on this task performed on multiple propellers. No more complicated tools are necessary, guesswork is eliminated, and accuracy is greatly improved. Any mechanic can use this tool.

Although the Propeller Blade Seal Positioning Gauge was created specifically for P-3 and C-130 aircraft, the simple design can be modified for use on any military or civilian aircraft, and on any type of marine vessel, large or small, that is powered with a turbo-prop or propeller-driven power plant. Each propeller blade shank will require a specific, calibrated gauge for a perfect fit, so repair shops will want to have multiple sizes on hand.


Materials needed to produce the Propeller Blade Seal Positioning Gauge:

  • Teflon or hard plastic
    • Precision molded
    • Precision notched
  • Etched “Made in USA”
  • Assorted sizes to fit all propeller blade shafts




The Propeller Blade Seal Positioning Gauge is covered by United States Utility Patent:8,887,407














For additional information, licensing opportunities, and a full prospectus on the Propeller Blade Seal Positioning Gauge  contact:


Amy Schleicher


VP of Business Development

Cell: 913-201-8025