# 2020 aluminum extrusion

> What is the 2020 extrusion profile for brackets and T-nuts?

- Category: Hardware › Framing
- Kind: Standard part
- Basis: industry standard profile; two slot families
- Page: https://xemstudio.com/objects/2020-extrusion/ · JSON: https://xemstudio.com/api/geometry?object=2020-extrusion · Plain text: https://xemstudio.com/objects/2020-extrusion/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

## Overall (mm)

| width | height |
|---|---|
| 20 | 20 |

## Notes

- 20 × 20 mm square; slot opening 6 mm (European/Misumi style, the common 3D-printer frame) or 5.26 mm (8020 10-series); center bore ~Ø4.2 for M5 tapping.
- Design brackets to the 6 mm slot with M5 T-nuts unless the frame is 8020-series.

## Where the files are

- Wikipedia: [T-slot structural framing](https://en.wikipedia.org/wiki/T-slot_structural_framing) — web — CC BY-SA 4.0 (text)

## Questions

**What is the slot width of 2020 extrusion?**

6 mm for European/Misumi style (the common 3D-printer frame), 5.26 mm for 8020 10-series; center bore about Ø4.2 for M5 tapping.

**What T-nuts fit 2020 extrusion?**

M5 T-nuts or drop-in/hammer nuts for the 6 mm slot; M3 and M4 T-nuts exist but M5 is standard.

## Fits with

- [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/)
- [Hex nuts, M2–M8 (ISO 4032)](https://xemstudio.com/objects/hex-nuts-metric/)
- [NEMA 17 stepper motor](https://xemstudio.com/objects/nema-17-stepper/)
- [608 ball bearing](https://xemstudio.com/objects/608-bearing/)