Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BBA-138A found under Brake Assembly Winc by Yale Industrial Products Inc. The National Stock Number assigned to this part is 3040012741675, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like BBA-138A.