This countersunk FH hex socket screw is supplied as a replacement fastener for input shaft assemblies. The YOKSD303S is suitable for MR-4TCSD chassis and includes a lock-processed thread to reduce the risk of loosening from vibration. Fit this part when original screws are worn to re-establish secure clamping without altering shaft alignment.
Compatibility and fitting notes: confirm thread pitch and head profile against the original fastener, ensure the head seats fully, and avoid excessive torque on the small 2.6mm thread. Inspect after a short run and keep spare screws on hand for maintenance, as the pack includes multiple pieces.
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