Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number DM55643 PAGE 7 ITEM 3 found under Screw Cap Socket He by Monsanto Co. The National Stock Number assigned to this part is 5305012806728, 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 DM55643 PAGE 7 ITEM 3.