Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 28-CC found under Sprocket Wheel by Michael Business Machines Corp. The National Stock Number assigned to this part is 3020012338916, and the Federal Supply Class is 3020 Gear Pulley Sprocket And Transmission Chain. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 28-CC.