Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS517 3 4TKXA found under Screw Machine by Dassault Aviation. The National Stock Number assigned to this part is 5305145127755, 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 NAS517 3 4TKXA.