Baker Motion offers a series of NEMA Adapter kits for Yaskawa Sigma servo motors.  These adapter kits also accommodate numerous other brands of motors.  When you application requires Sigma motors to conform to NEMA flange standards or inch versus metric shaft sizes (frequently required the U.S. market), these off-the-shelf adapter kits automatically provide that conformance.  Versions with flange and shaft, or flange only conversions are available.