Hirobo HI2521088 Collar 5 x 7 x 11 RC helicopter collar  [HI2521088]

Compact shaft collar for helicopters

This HIROBO collar is an RC-scale replacement part listed as 5 x 7 x 11 and intended for general helicopter assemblies. Its role is to secure axial position on rotating shafts and to serve as a simple retention element where space is limited.

Installation is straightforward: slide the collar onto the shaft to the required location and secure according to the component's existing fastening method. Avoid excessive clamp force to prevent shaft damage and check axial play after fitting. This collar is useful during routine maintenance, part swaps, and minor setup adjustments on RC helicopters.