Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HT4072-4-5-6 found under Screw Close Toleran by Alcoa Global Fasteners Inc. The National Stock Number assigned to this part is 5305011947060, 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 HT4072-4-5-6.