HIROBO HI2521101 3 x 4 x 3.5mm RC Nylon Spacer Collar for Links  [HI2521101]

Durable nylon spacing collar

This RC-scale collar is a compact spacer intended for helicopter linkages and other small-scale mechanisms where reliable clearance and alignment are required. It is supplied as a neutral replacement accessory for model maintenance rather than full-scale equipment. The collar ensures uniform clearance between pins and link components during typical operating loads.

Material and fit: constructed from nylon, the part balances low friction with sufficient wear resistance for light mechanical uses such as rotor head link connections and swashplate linkages. The nylon body helps prevent metal-on-metal binding and supports smoother rotational or oscillating motion in tight assemblies.

Installation notes: clean mating parts prior to fitting, slide the collar onto the pin to the seating face, and confirm unhindered movement of the linkage. If you observe slop, measure pin diameter and contact faces before trying alternate collar sizes. Use the collar as a passive spacer and tighten adjacent fasteners to recommended torque levels.

Tuning role: employ the collar to make measured spacing adjustments that reduce play and stabilise lever lengths across matching links. It is most effective when combined with correct link geometry and careful control setup.