Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4 40 CAP SS BLK OXD found under Nut Plain Cap by Allmetal Screw Products Corp. The National Stock Number assigned to this part is 5310011681765, 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 4 40 CAP SS BLK OXD.