Sunnen BL4120CH Hard Steel Mandrel 1.875 Inch Shank L Series

Sunnen BL4120CH Hard Steel Mandrel is a robust precision shaft in Sunnen's L Series, defined by a 1.875-inch shank and hard steel construction. This model sits in Sunnen's BL family of mandrels, designed to provide stable support and high rigidity in demanding setups where consistent concentricity matters. The 1.875-inch shank is the notable dimension carried by this variant, offering a mid-range size suitable for a range of honing and fixture configurations within Sunnen's tooling ecosystem. Built from hard steel, the BL4120CH aims to deliver wear resistance and dimensional stability across repeated cycles, helping to maintain bore geometry and surface finish when used with compatible honing fixtures and fixture accessories in precision machining environments. The BL4120CH designation identifies its place within Sunnen's catalog of high-precision mandrels in the L Series lineup, providing traceability to Sunnen's engineering standards. For exact mounting dimensions, tolerances, and recommended pairings with Sunnen tooling, consult the official Sunnen catalog or product page for the BL4120CH model.