The Waist Pin (OEM Part No. 5112303639) is a replacement mechanical component designed for Epiroc underground mining equipment, including SIMBA H1254 and Boomer 281. Manufactured from durable alloy steel, the waist pin is designed to provide a secure pivoting and structural connection within articulated mechanical assemblies. It supports controlled movement between connected components while maintaining proper alignment and structural integrity during equipment operation. The 5112303639 Waist Pin provides a practical aftermarket solution for replacing worn or damaged pivot components and supporting routine maintenance. Its robust alloy steel construction makes it suitable for demanding underground mining applications where reliable articulation and mechanical connection are essential.