Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number KM921-3 found under Fastener Cylinder Spring Loaded by Alcoa Global Fasteners Inc. The National Stock Number assigned to this part is 2590013313634, and the Federal Supply Class is 2590 Miscellaneous Vehicular Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like KM921-3.