Hirobo HI2521064 3 x 6 x 5S Shaft Collar Stop for RC Helicopter Use  [HI2521064]

Compact shaft collar for helicopter models

The Hirobo HI2521064 collar bears the 3 x 6 x 5S designation and is suitable for RC helicopter component assemblies. It functions as a compact axial spacer or stop on rotating shafts, assisting with endplay control and keeping parts positioned correctly in main and tail rotor linkages.

To use, position the collar at the required axial location, verify the alignment with surrounding gears and bearings, and fasten it in line with your model's fastening approach. Collars are a basic but effective measure during mechanical tuning to preserve gear mesh and control link geometry.