Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AZ21-BN 50-500K found under Adapter Test by Olympus Scientific Solutions. The National Stock Number assigned to this part is 6625016080016, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like AZ21-BN 50-500K.