This rotation head pin is manufactured as a compatible replacement for OEM part number 0665910086 and is used in the rotation head assembly of underground drilling equipment. Produced from hardened steel, it provides high resistance to wear, deformation, and fatigue under continuous drilling loads. The pin ensures stable rotational performance and secure component connection. It is suitable for equipment such as Simba E7C, Simba H1354, M4C rigs, and related underground drilling and rock reinforcement machinery.