This countersunk FH hex socket screw is intended as a replacement for RC input shaft assemblies where long-term retention is needed. The YOKSD303S is tailored for MR-4TCSD applications and features a lock-processed thread treatment to minimize loosening in high-vibration conditions typical of drift chassis. Fit these screws to recover reliable clamp force without affecting shaft geometry.
Service tips: confirm the head seats flush against the mating surface and ensure correct thread engagement. Avoid excessive torque on the small 2.6mm threads to prevent damage, then re-inspect after initial running. The component is supplied in a multi-piece pack so common service items are on hand during maintenance.
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