Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 80020-1 found under Knob by Singer Co The. The National Stock Number assigned to this part is 5355001378233, 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 80020-1.