I tried the AE Factory Team steel axles for my application. After installing the front, discovered my after-market nylok lock nut would not fully engage the threaded axle. There was just enough axle length for the stock low-profile serrated wheel nuts to fully grip the threads. Me, I don't like serrated nuts, so took the axle set back out and put the plastics back in. The threaded wheel nut axle length on the FT steel's is shorter by ~1-2mm than the stock plastics. Why? Dunno. Never did try installing the rears.
Maybe I just had a faulty set or maybe the next AE run lengthened the threaded wheel nut length? Dunno. For what they cost and the time and effort required for the change over not interested. Maybe you'll have better luck. Cheers. 'AC'