Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number TL4018 found under Gage Seal by Williams International Co Llc. The National Stock Number assigned to this part is 5210010331252, and the Federal Supply Class is 5210 Measuring Tools Craftsmens. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like TL4018.