Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A01-280C found under Knob by Berkey Technical Div. The National Stock Number assigned to this part is 5355008578615, and the Federal Supply Class is 5355 Knobs And Pointers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A01-280C.