Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B99-10874 found under Nut Plain Castellated Hexagon by Hb Performance Systems. The National Stock Number assigned to this part is 5310014350038, 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 B99-10874.