Hirobo HI2521064 3 x 6 x 5S Precision Collar for RC Helicopter Components  [HI2521064]

Axial shaft collar for helicopter components

This Hirobo HI2521064 collar is identified by the 3 x 6 x 5S marking and is intended for installation within RC helicopter component assemblies. It acts as a small axial stop or spacer on spinning shafts, aiding in the control of endplay and the retention of component position across tail and main drive linkages.

Fit the collar where axial control is needed, confirm alignment with adjacent gears and bearings, and secure it following your model's recommended practice. As a simple mechanical tune item, collars help maintain gear mesh and correct link geometry during ongoing setup and flying adjustments.