Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MC1 5 5-ST-3 81 found under Connector Receptacl by Phoenix Contact Inc. The National Stock Number assigned to this part is 5935016221810, 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 MC1 5 5-ST-3 81.