Sunnen K12385AS Soft Steel Mandrel 3.625 Inch Shank K Series

The Sunnen K12385AS K12 Soft Steel Mandrel is a Sunnen K Series honing mandrel designed for high-precision bore finishing on small-diameter workpieces. It features a reach length of 3.625 inches, a shank length of 1.875 inches, and an abrasive length of 1.75 inches, and it accommodates a bore size from 0.385 to 0.400 inches. The tool uses a soft-steel shoe with a K12 stone size, and is part of the K12 sub-family within the K Series. Designed for versatility, durability, and consistent bore geometry and surface finish across materials, it is well-suited for both production and job-shop environments where fast setup and reliable operation are critical.