Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 20409-003 FIND 39 found under Screw Cap Socket He by Dover Corp. The National Stock Number assigned to this part is 5305013222550, 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 20409-003 FIND 39.