This countersunk FH hex socket screw is a direct replacement for small RC input shaft fixings. The YOKSD303S fits MR-4TCSD chassis and features a lock-processed thread that reduces self-loosening from vibration often found in drift setups. Use it to replace worn fasteners and restore secure clamping without altering shaft alignment.
Installation guidance: match the driver to the FH socket, tighten gradually to avoid stripping the fine 2.6mm threads, and check seating against the mating surface. Run a short test and re-check torque. The screws are supplied as a service pack so you have spares for on-track repairs.
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