O.S. Engine OS29025400 CSM4X17 Silencer Fixing Screw 855 108FSR  [OS29025400]

O.S. ENGINES SILENCER MOUNTING SCREW CSM4X17 855 108FSR
Price:
£3.79
Brand:
O.S. Engine
Model:
OS29025400
GTIN:
4531028118041
Condition:
Brand New
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Silencer fixing screw for model engines

The screw is identified by manufacturer code CSM4X17 and appears together with 855 and 108FSR in the original product title. It is a purpose-made fastener for securing a silencer to an RC engine exhaust, helping preserve alignment under vibration and during adjustment procedures.

Fit this item as a direct replacement when the part code on your diagram matches CSM4X17 or the listed numbers. Ensure the threads engage correctly and the screw seats properly to avoid misalignment; inspect threads for wear prior to installation.

Functionally, the screw contributes to consistent exhaust sealing and positioning rather than altering engine performance. Regular checks and timely replacement help keep tuning and running behavior predictable by preventing silencer movement.

How do I verify the correct part number for my model

Consult your model's spare parts list or the parts diagram; if it lists CSM4X17 or includes 855/108FSR, this screw matches the specification.

Any tips for fitting without damaging threads

Hand-start the screw to ensure correct thread engagement, avoid cross-threading, and tighten only until the silencer seats flush. Replace if resistance or stripping is detected.

When should this screw be replaced

Replace the screw if threads are worn, the head is rounded, or it will not clamp the silencer securely. Timely replacement prevents exhaust misalignment during operation.

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