7 x 8 x 10 Hirobo HI2521059 Precision Shaft Collar for RC Helicopters  [HI2521059]

Precision Collar for Rotor Shafts

The part is identified as HI2521059 and carries the 7 x 8 x 10 marking shown in the title. It serves as a small locating and retention collar used in helicopter component assemblies where precise axial placement of rotating parts contributes to reliable drivetrain function.

The collar is intended to prevent axial shaft movement and to keep linkages or gear interfaces positioned correctly during setup, tuning and flight. Always compare the 7 x 8 x 10 marking with your helicopter's parts diagram or service manual before fitting to ensure compatibility.

Installation note: slide the collar onto the shaft, position it where needed, and secure with the fastening method recommended for your model; do not over-tighten and re-check alignment after an initial test run.