Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number Y422-5003PN18 found under Screw Cap Hexagon H by Electric Boat Corporation. The National Stock Number assigned to this part is 5305016266105, and the Federal Supply Class is 5305 Screws. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like Y422-5003PN18.