Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3MB-181 found under Screw Machine by Sulzer Metco Us Inc. The National Stock Number assigned to this part is 5305014596313, 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 3MB-181.