Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 12500840 found under Washer Shouldered by L 3 Communications Klein Associates. The National Stock Number assigned to this part is 5310015090773, 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 12500840.