Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C7985B4-9 found under Screwclose Tolerance by Tactair Fluid Controls Inc. The National Stock Number assigned to this part is 5305016820636, 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 C7985B4-9.