Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number W06S18 found under Washer Key by Whittet Higgins Company. The National Stock Number assigned to this part is 5310001861031, 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 W06S18.