Wire Shelf Stacking Connector

thingiverse

I had two wire shelving units (1" poles) where the leveling feet bolt holes were permanently fastened. I wanted to connect them together to make one pretty-tall shelf unit for my makerspace. Basically I needed to attach something where the leveling feet went to where the top endcaps were, which was unthreaded (see image). This connector takes a 3/8" bolt (9/16" wrench) to screw into the ex-leveling-foot threads, and extends into the ex-tube-cap hole about an inch, which is more than enough to provide some lateral stability (initial prototype was about 1/2" which was sufficient). The extra length provides a bit of "lift" stability in case... um... not sure. There's about a 0.05" "rim" to separate the two poles. I don't have a great reason for including that other than to protect the ex-tube-cap pipe so it doesn't rub metal-on-metal with the other pole.