Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 18 4012 8603 6 found under Screw Machine by 3M Company. The National Stock Number assigned to this part is 5305002017759, 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 18 4012 8603 6.