Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B43-BB-4 found under Mount Resilient Utility by Barry Wright Corporation. The National Stock Number assigned to this part is 5340016699550, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B43-BB-4.