The Key (OEM Part No. 3128317617) is a mechanical spare part compatible with Epiroc Boomer 291, Boomer S2, S1D-1, S1D-2, and S2 underground drilling rigs. Manufactured from high-quality alloy steel, it functions as a locking and positioning component for shaft or assembly fixing positions. The key ensures accurate alignment between connected components, prevents unwanted movement, and improves mechanical transmission reliability. Designed for demanding mining applications, it offers excellent strength, wear resistance, and durability. This precision replacement part supports efficient equipment maintenance and reliable drilling rig operation.