Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3121-4 found under Plate by Manitowoc Engineering Co Division. The National Stock Number assigned to this part is 2540011970274, and the Federal Supply Class is 2540 Vehicular Furniture And Accessories. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 3121-4.