The Washer (OEM Part No. 3128209401) is a mechanical spare part compatible with Epiroc underground drilling rigs, including M2D, 235 Boltec, Boltec-MC, Boomer L2D, BOOMER-M2C, Boomer MD, and M2C models. Manufactured from durable alloy steel, it functions as a fastening and spacing component in bolt connection positions. The washer helps distribute load pressure, improve fastening stability, prevent surface damage, and maintain proper alignment between connected components. Designed for demanding mining environments, this precision-machined washer provides reliable performance, excellent durability, and long service life for drilling rig maintenance and repair applications.