Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 12BR found under Milling Machine Tool And Die by Bridgeport Machines. The National Stock Number assigned to this part is 3417004078745, 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 12BR.