This replacement pin is designed as a compatible alternative to OEM part number 0501000051 and functions within the rotation head assembly of drilling equipment. Manufactured from hardened steel, it provides reliable torque transmission and operational stability during drilling. The robust construction ensures resistance to wear, impact, and fatigue under continuous rotation. It is suitable for installation on M4C drill rigs, Simba H1254, and PowerROC D55 machines used in mining and quarrying applications.