Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1-4-20-3-8INBRASSRDHEAD found under Screw Machine by Elco Industries Inc. The National Stock Number assigned to this part is 5305007914055, 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 1-4-20-3-8INBRASSRDHEAD.