This hardened steel pin is manufactured as a compatible replacement for OEM part number 0665930086 and is used within the rotation head assembly of underground drilling equipment. Designed to operate under high torque and continuous rotational loads, it supports stable power transmission and precise component alignment. The wear-resistant material construction ensures long service life in demanding mining environments. This pin is suitable for M4C drill rigs as well as Simba H1354 and SIMBA H1254 machines commonly used in underground drilling operations.