Hirobo HI2521046 Collar 3 x 5 x 5 for Helicopter General Parts  [HI2521046]

Collar for RC helicopters

This Hirobo collar is an RC-scale replacement part listed as HI2521046, identified by its 3 x 5 x 5 dimension. It serves as a small locating collar used in helicopter general parts where precise axial positioning of shafts or thin-diameter components is required.

In practical model use, collars of this size are installed on transmission shafts, linkages, or spacer points to hold components in position and reduce unwanted axial play. The design is compact so it integrates with tight assemblies typical of electric RC helicopters and similar hobby airframes.

Installation is straightforward: verify the inner diameter and shaft diameter match, clean mating surfaces, then slide the collar onto the shaft to its intended stop point. For assemblies that require a secure press fit use a suitable mechanical retention method recommended by your maintenance practice, and avoid excessive force that could deform small parts.

For tuning and maintenance, collars like HI2521046 help maintain consistent servo-to-link geometry and preserve pre-set trim during test flights or bench checks. They are a low-cost consumable that simplifies replacing worn spacers without altering primary control link settings.