Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6X31 found under Cup Grease by Napco International Llc. The National Stock Number assigned to this part is 4730005214683, and the Federal Supply Class is 4730 Hose Pipe Tube Lubrication And Railing Fittings. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 6X31.