Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AC-66EC found under File Rotary by Beaver Cut Rotary File Co. The National Stock Number assigned to this part is 3455001737223, and the Federal Supply Class is 3455 Cutting Tools For Machine Tools. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like AC-66EC.