O.S. Engine OS22025619 Muffler Mounting Screw 702P  [OS22025619]

Secure muffler fastener for model engines

This O.S. Engine OS22025619 screw is a single threaded fastener designed to lock mufflers and exhaust brackets to nitro and small-scale gas model engines. It is supplied as an individual retention component where a muffler flange or exhaust mount requires a reliable threaded connection.

Installation is simple: align the muffler flange with the exhaust outlet or bracket, pass the screw through the mount point, and tighten until snug. Take care not to over-torque to avoid damaging threads in the engine mounting boss or the muffler flange. Use standard hand tools and verify fit before each run.

During tuning and routine maintenance this screw acts as the primary retention point for exhaust orientation. Check it regularly during break-in and after hard runs to ensure it remains tight against vibration and thermal cycling, and inspect for wear when swapping mufflers.