Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 81661190000 found under Washer Lock by Plessey Spa. The National Stock Number assigned to this part is 5310121586966, 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 81661190000.