Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B137H-0.38 AND B139 found under Shaft And Spring As by Conductix Inc. The National Stock Number assigned to this part is 3040012928025, 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 B137H-0.38 AND B139.