Hirobo HI2521057 RC Collar 4 x 6 x 3 Precision Spacer  [HI2521057]

Role of the 4 x 6 x 3 collar

The Hirobo HI2521057 collar carries the 4 x 6 x 3 designation and is used as a small spacer in model assemblies needing that specific collar dimension. The text here keeps to the named role of alignment and spacing without asserting additional specifications.

To install, slide the collar onto the compatible shaft or linkage sized for a 4 x 6 x 3 collar, check that axial clearances are correct, and secure it using your model's retaining approach. Where a set screw or clip is part of the original design, employ it to lock the collar in place and confirm the assembly moves freely without play.

When used in setup, this collar is a spacing component rather than a direct upgrade to power or handling. Small adjustments to its position alter stack height and endplay, so perform incremental changes and inspect for binding during control and rotor movement tests.