Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS1801-4D8 found under Screw Machine by National Aerospace Standards. The National Stock Number assigned to this part is 5305011933855, 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 NAS1801-4D8.