Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FV53-228-2 found under Washer Key by Automatic Switch Company. The National Stock Number assigned to this part is 5310007663637, 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 FV53-228-2.