Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 16990-98C-8 found under Screw Machine by Tab Engineering. The National Stock Number assigned to this part is 5305013866011, and the Federal Supply Class is 5305 Screws. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 16990-98C-8.