13 x 16 x 12 Shaft Collar for Helicopter Shafts - HIROBO HI2521074  [HI2521074]

Compact shaft stop for accurate positioning

Recorded under Hirobo helicopter general parts, this HIROBO HI2521074 collar carries the 13 x 16 x 12 marking and is designed for RC-scale shaft applications. Its primary role is to provide a small, reliable axial stop or spacer for driven shafts where shaft location influences rotor tracking and drivetrain alignment.

Correct use requires confirming the collar bore and outer sizes against the shaft and adjacent components. Practically, measure the shaft diameter and the clearance on the frame or rotor head to ensure the 13 x 16 x 12 dimensions will not cause obstruction. The part is intended for hobby maintenance, repair, and tuning rather than wholesale subsystem replacement.

In assembly or service, the collar offers positional control: it can limit axial movement, help sustain correct gear mesh, and provide a straightforward reference during setup and trimming procedures.