Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 40000X72 found under Screw Tapping by Darling Special Products Inc. The National Stock Number assigned to this part is 5305012640327, 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 40000X72.