Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS560HK4-6 found under Screw Machine by Rkr Technologies Ltd. The National Stock Number assigned to this part is 5305009841640, 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 NAS560HK4-6.