Hirobo HI2521106 3 x 6 x 10.4mm Positioning Collar  [HI2521106]

RC shaft positioning collar

The Hirobo collar shown as HI2521106 is an RC-scale shaft collar measuring 3 x 6 x 10.4 as indicated in the product title. It is intended for general helicopter parts that require a compact locating element, serving as a mechanical stop and alignment aid to retain components on narrow shafts during adjustments.

Fitting is simple: slide the collar onto the shaft to the desired location then secure according to your model's fastening method. Avoid over-tightening set screws to prevent shaft damage and verify clearance before completing assembly. As a generic collar, always confirm shaft diameter and available clearance prior to use.

For assembly and tuning the collar functions as a precision spacer for small positional changes, useful when fine-tuning rotor linkages or accessory mounts. It is supplied as a single component intended for RC model maintenance tasks.