Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 503853-001 found under Knob by Rugged Information Technology Eq. The National Stock Number assigned to this part is 5355013062398, 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 503853-001.