This hardened steel pin is manufactured as a compatible replacement for OEM part number 0501000016 and is used within the rotation head assembly of drilling equipment. It plays a key role in transmitting rotational forces while maintaining stable alignment under continuous torque and vibration. The pin is engineered for high durability and resistance to wear in demanding mining environments. It is suitable for use on M2D, T1D, M2C, Boomer 281, Boomer 291, Boomer L2D, and related drill rigs and bolting machines.