RC Helicopter Collar 2 x 3.5 x 3 - Hirobo HI2521143  [HI2521143]

Use in trimming and maintenance

This Hirobo collar is catalogued as HI2521143 and serves as a compact replacement part for helicopter assemblies that need precise shaft retention. The 2 x 3.5 x 3 marking helps you identify the correct size for your application.

Fitting is direct: place the collar at the required position on the shaft, ensure the parts align, then secure it with the appropriate set screw or fastener indicated by your model's parts list. Always check for free movement after installation to avoid rotor or linkage interference.

During tuning, collars let you lock positions so trim settings can be reproduced across test flights; keeping spares reduces downtime during field tuning or repairs.