OS Engine Locknut Set FS70/91S/91FX : 45910100

An O.S. Safety Propeller Locknut assembly prevents the propeller from being thrown - even if it becomes loose in operation. Particularly suitable for medium to larger four strokes and essential for engines that are prone to kicking the prop free due to a backfire. Supplied as standard with all O.S. four strokes from .70 cu.in. capacity and up.

5/16 UNF Thread

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