Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C4B1328 3 found under Washer Key by Bombardier Aerospace. The National Stock Number assigned to this part is 5310008790998, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like C4B1328 3.