Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 18S-FS2 .25IN ITEM 6 found under Gasket Spiral Wound by Newmans Inc. The National Stock Number assigned to this part is 5330015841618, and the Federal Supply Class is 5330 Packing And Gasket Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 18S-FS2 .25IN ITEM 6.