Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B1831BH040030N found under Screw Cap Socket He by American National Standards Inst. The National Stock Number assigned to this part is 5305015013094, 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 B1831BH040030N.