Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2R3-28 found under Milling Machine Horizontal Unive by Van Norman Machine Co Inc. The National Stock Number assigned to this part is 3417002387553, and the Federal Supply Class is 3417 Milling Machines. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 2R3-28.