Strong Corner Brackets for 20mm extrusions

by iquizzle May 8, 2014
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What are the little metal threaded brackets called? And do they fit in the 2020 extrusion with the m4 size? Thanks

Those are "T-nuts" like you would buy from misumi or other places that sell the extrusion. They are specifically made for compatibility with the extrusion. They come in sizes that fit either M4 or M5 bolts -- so I included STLs for each.