The Coupling (OEM Part No. 3115027700) is a mechanical spare part compatible with Epiroc underground drilling rigs, including M4C, M2D, T1D, M40S, Boomer XE3C, Boomer 291, Simba H1354, Boomer 281, S7D, Boomer L2D, Boomer S2, BOOMER-M2C, COP, RD-14U, S1D, S2, and S7D models. Manufactured from high-strength alloy steel, it functions as a power transmission and connection component in the rock drill drive system. The coupling ensures reliable torque transfer between connected components, improves mechanical stability, and supports efficient drilling performance in demanding mining environments.