This hardened steel pin is designed as a compatible replacement for OEM part number 0666809702 and functions as a wear part within the rotation head assembly of underground drilling and bolting equipment. It is engineered to handle continuous rotational forces while maintaining accurate alignment and reliable load transfer. The pin is suitable for M4C platforms, Simba H1354, SIMBA H1254, Boltec MC, Boomer L2D, and BOOMER-M2C rigs used in mining and rock reinforcement operations.