Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D366X1 4 found under Screw Machine by Elco Industries Inc. The National Stock Number assigned to this part is 5305013264798, 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 D366X1 4.