Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS1191E04T4 found under Screw Cap Socket He by Hardware Specialty Co Inc. The National Stock Number assigned to this part is 5305010212530, 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 NAS1191E04T4.