The propeller washer sits between the propeller and the prop nut, spreading the clamping load across the prop hub so the nut doesn't dig into it. O.S. lists it as item 8 in the parts diagrams for the MAX 25LA, 25LA-S and 46LA-S, and the same part covers the range from 25LA through 46LA.

Prop washers get replaced when the face is scored, dished or burred — usually after a prop strike or from repeated over-tightening. A damaged washer won't hold the prop securely no matter how tight the nut is, and a prop that works loose in flight is not a problem worth risking for a part this cheap.

Fitment

Fits O.S. MAX 25LA to 46LA engines, per the O.S. parts manual. Check your engine's parts diagram against part number 24009000 before ordering.

Specifications

Type: propeller washer
O.S. part number: 24009000
Position: front, between propeller and prop nut
Contents: 1 washer

Not to be confused with

• Thrust washer 22020001 — item 10 in the same diagrams, sits behind the drive hub. Different part.
• Propeller nut 23210007 — the 1/4-28 nut that threads on in front of this washer, covering 21 to 61 size engines.