Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 72A3 found under Grinding Machine Internal Chucki by Cincinnati Milacron Inc. The National Stock Number assigned to this part is 3415002220872, and the Federal Supply Class is 3415 Grinding Machines. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 72A3.