Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3SERIES found under Key Drill Chuck by Jacobs Mfg Co The. The National Stock Number assigned to this part is 3460002645580, and the Federal Supply Class is 3460 Machine Tool Accessories. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 3SERIES.