Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B1821BH113C550N found under Screw Cap Hexagon Head by Cinch Connectors Ltd. The National Stock Number assigned to this part is 5305012770444, 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 B1821BH113C550N.