Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 915-0553-021 found under Socket Plug In Electronic Compon by Johnson E F Co. The National Stock Number assigned to this part is 5935000989510, 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 915-0553-021.