Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 503-3431 found under Connector Receptacle Electrical by Pertec Computer Corp. The National Stock Number assigned to this part is 5935012560083, 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 503-3431.