These are Kyosho UBW007 velvet coating 5.8mm shock flange balls supplied as a set of 4 pcs for RC-scale models. They are intended as replacement components for shock end linkages and rod ends that require 5.8mm flange balls. The velvet coating reduces contact friction while leaving the aluminum beneath intact.
Fitting is simple for anyone used to basic shock servicing: remove the old flange ball, check the mating surfaces for wear or burrs, then press the new UBW007 flange ball onto the shock shaft or linkage stud. Recheck free movement through full travel after installation and make any necessary adjustments. Basic hand tools such as small pliers or hex drivers are normally all that is required.
As part of a setup routine, swapping in fresh flange balls can noticeably reduce stiction at pivot points and improve the small-deflection response of the suspension. This helps when fine-tuning damper settings and spring rates for predictable behaviour on technical sections of a course.
Packed as four pieces, the UBW007 flange balls are handy service spares to maintain consistent suspension movement and handling during setup and use.
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