O.S. Engine OS28309000 GT33 Propeller Washer for RC Engine Crank Shaft  [OS28309000]

GT33 propeller washer summary

This propeller washer is an RC-scale accessory designed to sit between a propeller and its retaining hardware on model engine crank shafts. It is a GT33-style washer supplied under O.S. Engine's OS28309000 reference and provides a consistent contact face that helps the propeller seat reliably against the prop hub.

Fitting is simple and needs no specialist tools beyond those used for prop mounting. Slide the washer onto the crank shaft or prop adapter, position the prop, then secure the retaining nut or retainer following your engine manual. The washer helps stabilise seating and reduces variation when tightening prop mounting hardware.

On the bench the washer supports repeatable propeller placement, which aids small balance or timing checks. It also works well as a spare part for routine inspections, allowing quick swaps during prop checks and maintenance between flights.