The Spacer (OEM Part No. 3128310522) is a structural spare component compatible with Simba M4C, Simba M40S,Simba H1354, and SIMBA H1254 underground drilling rigs. Manufactured from durable alloy steel, it is designed for the rock drill assembly rotation unit position. The spacer maintains accurate spacing and alignment between mechanical components, ensuring stable assembly performance during drilling operations. Its strong construction provides reliable support, precise fitting, and long service life under demanding underground mining conditions. This OEM replacement spacer helps maintain equipment accuracy and operational stability of the rotation system.