2109 Series Stainless Steel REX™ Shaft (12mm Diameter, 120mm Length)

This 120mm Length 12mm REX™ Shaft is a hefty solution for fierce positive drive! You can use it to drive heavy-duty 12mm REX™ bore motion components, such as hubs and sprockets, throughout the goBILDA® build system. 

12mm REX™  combines a 12mm Round profile with an 11mm hEX profile to give you the best of both worlds: positive drive, plus the capacity to run smoothly in conventional round bearings. 12mm REX™ is the large-scale big brother to the ever-popular 8mm REX™ profile (a star of the everyday builds that don’t go quite as big).

The 12mm diameter provides plenty of clearance for the shaft to pass through any goBILDA® 14mm center hole. We offer a variety of super-sized bearings and pillow blocks that can easily support this super-sized shaft.

The E-clip on this 2109 Series Shaft provides constraint in one direction, such as against a ball bearing. There are two retaining ring grooves where you can install the E-clip.

• At the “factory” location where the E-clip arrives pre-installed, 10mm of shaft is available past the E-clip. This provides for the shaft, past the E-clip, to nestle into a bearing. 
• If you install the E-clip in the alternate location, the amount of shaft past the E-clip will be lessened to provide greater clearance. This position measures 4mm from the far side of the E-clip and leaves the long side of the shaft with a nice whole-number length!

Each end of the shaft has an M4 threaded hole. This versatile feature means you can use the shaft as a standoff. You can also insert a screw (and washer, if needed) to constrain a component to the end of the shaft.