RC Helicopter 12 x 18 x 1 Shaft Collar - Hirobo HI2521136  [HI2521136]

Shaft collar function and fit

This Hirobo collar (model HI2521136) is provided as a small-scale part for use with Hirobo helicopter general parts. The 12 x 18 x 1 sizing makes it suitable where a slim, low-profile retaining collar is needed on rotating model helicopter shafts.

The collar works as a mechanical stop and alignment device, limiting axial movement and helping preserve concentric alignment of shafts and mating components. It is intended for model helicopter assemblies only, not for full-size equipment.

Installation guidance: position the collar at the required axial point on the shaft and secure it according to your helicopter's retention method. Check mating surfaces for damage or burrs before fitting to prevent misalignment. After fitting, inspect for any binding or tilt in the rotor assembly.

Adjustment role: deploy this collar to fine-tune axial placement of gears, bearings, or rotating parts when small changes are needed to reduce endplay or improve mesh alignment. Make small changes and validate results with slow bench testing prior to flying.