Reddit reviews National Hardware 4020BC Slotted Steel Angle, 1-1/2 by 48-Inch, Galvanized
We found 2 Reddit comments about National Hardware 4020BC Slotted Steel Angle, 1-1/2 by 48-Inch, Galvanized. Here are the top ones, ranked by their Reddit score.
Authorized Replacement for Stanley Hardware Stock #N180-083Slotted for easy attachmentCorrosion-resistant galvanized finish
Not OP but I built a desk with almost identical dimensions and had the same worries. I ended up getting a piece of 1" angle iron (similar to this but thicker) cut the same distance as the desk and attached it to the back and bottom. It's only been a year but I've got no sag yet.
Something like this holds my R710 just fine. You can probably find it cheaper at your local hardware store.
https://www.amazon.com/gp/product/B0027E3JYG/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1