Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 181668 found under Screw Cap Hexagon Head by E D Etnyre And Co. The National Stock Number assigned to this part is 5305000711788, 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 181668.