Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B4340 found under Shaft Assembly Flexible by Stewartwarner Corporation. The National Stock Number assigned to this part is 3040001257892, 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 B4340.