Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SS-164 ITEM 18 found under Nut Self Locking Hexagon by Val Matic Valve And Manufacturing. The National Stock Number assigned to this part is 5310016053254, 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 SS-164 ITEM 18.