Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C21S16-20A0 found under Contact Electrical by Raytheon Systems Ltd. The National Stock Number assigned to this part is 5999010487633, and the Federal Supply Class is 5999 Miscellaneous Electrical And Electronic Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like C21S16-20A0.