Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FS 10X12 found under Washer Spring Tensi by Rmb Miniature Bearings Inc. The National Stock Number assigned to this part is 5310013405683, 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 FS 10X12.