Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5-1-4163 found under Jsmlt Adpt Oring Gasket Repl Pkg by Hamilton Associates Inc. The National Stock Number assigned to this part is 6665015811166, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 5-1-4163.