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

GT33 prop washer details

Designed for RC model engines, this propeller washer sits between the prop and its retaining hardware on the crank shaft. Identified by O.S. Engine as OS28309000, the GT33 washer provides a stable seating surface so the propeller locates cleanly against the prop hub.

Fitting is quick using normal prop-mounting tools: slide the washer onto the shaft or adapter, place the prop, then secure with the nut or retainer following the engine's torque advice. The washer reduces seating inconsistency when you tighten the prop mounting hardware.

During tuning and bench checks the washer helps keep prop placement repeatable, aiding subtle balance and timing evaluations. It is also handy to carry as a spare for routine inspection and fast replacement between sessions.