Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 57-20500-7 found under Connector Receptacle Electrical by Amphenol Cadre Div Bunker Ramo Corp. The National Stock Number assigned to this part is 5935008403924, 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 57-20500-7.