Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S1BG221 found under Knob by Kraus And Naimer Inc. The National Stock Number assigned to this part is 5355013215354, 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 S1BG221.