Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number X21-516-4A found under Clamp Cable Electrical Connector by Bae Systems Bofors Ab. The National Stock Number assigned to this part is 5935002400173, and the Federal Supply Class is 5935 Connectors Electrical. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like X21-516-4A.