Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number X1131T2 found under Washer Flat by Curtiss Wright Electro Mechanical Corporation Div Steam And Air Solutions. The National Stock Number assigned to this part is 5310002091015, 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 X1131T2.