Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B1821BH050C125L found under Bolt Machine by American National Standards Inst. The National Stock Number assigned to this part is 5306011944974, and the Federal Supply Class is 5306 Bolts. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B1821BH050C125L.