The REX™ profile is a fusion of Round and HEX profiles which combines the best of both worlds. The six outer points of the hex are clipped to a common diameter so you can run the shafting in a round bore bearing.  The flat-to-flat shape provides a positive drive when paired with REX™ profile components.
 
This feature-rich 120mm length shaft rocks an 8mm REX™ profile: a combination of an 8mm Round and a 7mm hEX profile. The round profile gives you the ability to run this shaft in 8mm round bore bearings (though we do offer a plethora of 8mm REX™ bore bearings and pillow blocks). The hex profile, meanwhile, provides the positive drive your project deserves. Threaded ends allow you to use these shafts as conventional standoffs, create dead axles, and fasten items to their ends with ease.
The included E-clip can serve as a built-in end-stop due to its collar-like capabilities. The shaft measures a convenient 4mm from the short end of the shaft to the far side of the clip so that selecting the right shaft length doesn’t leave you deep in the decimals. The 3.3mm of shaft protruding beyond the E-clip is enough to seat the shaft in a bearing when you're running that bearing from the inside of 1120 Series U-Channel. If you’d like to use the shaft without the E-clip, don’t worry: it’s easy to remove and re-install according to your project needs.