Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 998 1901 found under Screw Cap Socket He by A L D Inc. The National Stock Number assigned to this part is 5305013743775, 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 998 1901.