Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C139678 found under Shaft Shouldered by W W Grainger Inc. The National Stock Number assigned to this part is 3040014291335, 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 C139678.