Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MS2550012A40000 found under Screwcapsocket Head by Fastenal Company. The National Stock Number assigned to this part is 5305016859603, 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 MS2550012A40000.