The Key (OEM Part No. 3128317617) is a mechanical locking and positioning component compatible with Epiroc underground mining equipment, including S2C, Boomer 291, Boomer S2, S1D and S2 models. Manufactured from durable alloy steel, the key is designed to secure and accurately position mating mechanical components within an assembly. It helps prevent unwanted movement between connected parts while supporting proper alignment and reliable mechanical power transmission. Designed for demanding underground drilling environments, 3128317617 provides a dependable replacement solution for equipment maintenance and repair. Its robust construction supports stable assembly performance and long service life in heavy-duty mining machinery applications.