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Aluminium T-slot extrusion: 2020, 2040, 2060, 2080, V-slot, 3030, 3060, 4040, 4080, 1010, 1515
What are the slot dimensions of 2020, 3030 and 4040 aluminium extrusion? · Hardware · basis: Common European / Misumi 20-, 30- and 40-series profiles (6 and 8 mm slots), OpenBuilds V-slot, and 80/20 10- and 15-series inch profiles; cavity dimensions typical of the 'standard' (non-light) profile, ±0.3 mm by maker
Long Earth Society build part. The LES engine test stands and generator rigs are 2020/2040 frames. The engines · all LES parts
- sizes
- 16 in table
Notes
- 20-series (2020, 2040…): 20 mm pitch, 6.0 mm slot opening, ~11 mm wide slot cavity behind 1.8 mm lips, 6 mm deep, Ø4.2 centre bore (tap M5). V-slot is the same with 6.2 mm opening and 45° chamfered lips for Delrin wheels. 30-series: 8 mm slot, Ø6.8 bore (M8). 40-series: 8 mm slot (10 mm on heavy), Ø6.8–8.5 bore. 80/20 10-series: 1 in, 0.256 in (6.5 mm) slot, 0.2 in bore (1/4-20); 15-series: 1.5 in, 0.32 in (8.2 mm) slot, 0.26 in bore (5/16-18).
- Print the profile to check brackets before cutting aluminium: 100 mm stubs here. Printed extrusion is not structural, but a printed 2020 stub with slide-in nuts is exactly how to prototype a mount.
- Design rule for attachments: anything that touches the extrusion face is flat; anything in the slot is 5.8 mm wide (6 mm slot) or 7.8 mm (8 mm slot) and no deeper than the lip + 0.5 mm unless it is a nut. Tongues on brackets stop rotation. M5 button heads on 20-series, M8 on 40-series.
- LES: the engine test stands and the generator rigs are 2020 and 2040 frames with the printed brackets in the companion entry.
Sizes
| profile | size_mm | slot_mm | cavity_mm | depth_mm | bore_mm | type |
|---|---|---|---|---|---|---|
| 2020 | 20 × 20 | 6.0 | 11.0 | 6.0 | 4.2 | T |
| 2040 | 40 × 20 | 6.0 | 11.0 | 6.0 | 4.2 | T |
| 2060 | 60 × 20 | 6.0 | 11.0 | 6.0 | 4.2 | T |
| 2080 | 80 × 20 | 6.0 | 11.0 | 6.0 | 4.2 | T |
| 4040 (20-series double) | 40 × 40 | 6.0 | 11.0 | 6.0 | 4.2 | T |
| V-slot 2020 | 20 × 20 | 6.2 | 11.0 | 6.0 | 4.2 | V |
| V-slot 2040 | 40 × 20 | 6.2 | 11.0 | 6.0 | 4.2 | V |
| V-slot 2080 | 80 × 20 | 6.2 | 11.0 | 6.0 | 4.2 | V |
| 3030 | 30 × 30 | 8.0 | 16.5 | 8.5 | 6.8 | T |
| 3060 | 60 × 30 | 8.0 | 16.5 | 8.5 | 6.8 | T |
| 4040 | 40 × 40 | 8.0 | 20.0 | 9.5 | 6.8 | T |
| 4080 | 80 × 40 | 8.0 | 20.0 | 9.5 | 6.8 | T |
| 4040 heavy (10 mm slot) | 40 × 40 | 10.0 | 22.0 | 11.0 | 8.5 | T |
| 1010 (1 in, 10-series) | 25.4 × 25.4 | 6.5 | 14.4 | 7.1 | 5.1 | T |
| 1020 | 50.8 × 25.4 | 6.5 | 14.4 | 7.1 | 5.1 | T |
| 1515 (1.5 in, 15-series) | 38.1 × 38.1 | 8.2 | 20.5 | 9.6 | 6.6 | T |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | T-slot structural framing | web | CC BY-SA 4.0 (text) |
| Misumi | Aluminum extrusions HFS5 (20 mm) / HFS6 (30 mm) / HFS8 (40 mm) series drawings | web, STEP, PDF | Misumi site terms verify |
| 80/20 Inc. | 10-series and 15-series T-slot profiles | web, STEP, PDF | 80/20 site terms verify |
| OpenBuilds | V-Slot linear rail profiles | web, STEP | OpenBuilds, CC BY-SA 4.0 (V-Slot) verify |
| Long Earth Society | Engine and rig builds on extrusion frames | web, video | LES site |
Free files
★ Free files 16 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| 2020-100 | 2020: 20 × 20 mm, slot 6.0 mm, 100 mm stub | STEP · STL |
| 2040-100 | 2040: 40 × 20 mm, slot 6.0 mm, 100 mm stub | STEP · STL |
| 2060-100 | 2060: 60 × 20 mm, slot 6.0 mm, 100 mm stub | STEP · STL |
| 2080-100 | 2080: 80 × 20 mm, slot 6.0 mm, 100 mm stub | STEP · STL |
| 2020-2x2-100 | 4040 (20-series double): 40 × 40 mm, slot 6.0 mm, 100 mm stub | STEP · STL |
| vslot-2020-100 | V-slot 2020: 20 × 20 mm, slot 6.2 mm, 100 mm stub | STEP · STL |
| vslot-2040-100 | V-slot 2040: 40 × 20 mm, slot 6.2 mm, 100 mm stub | STEP · STL |
| vslot-2080-100 | V-slot 2080: 80 × 20 mm, slot 6.2 mm, 100 mm stub | STEP · STL |
| 3030-100 | 3030: 30 × 30 mm, slot 8.0 mm, 100 mm stub | STEP · STL |
| 3060-100 | 3060: 60 × 30 mm, slot 8.0 mm, 100 mm stub | STEP · STL |
| 4040-100 | 4040: 40 × 40 mm, slot 8.0 mm, 100 mm stub | STEP · STL |
| 4080-100 | 4080: 80 × 40 mm, slot 8.0 mm, 100 mm stub | STEP · STL |
| 4040-heavy-100 | 4040 heavy (10 mm slot): 40 × 40 mm, slot 10.0 mm, 100 mm stub | STEP · STL |
| 1010-100 | 1010 (1 in, 10-series): 25.4 × 25.4 mm, slot 6.5 mm, 100 mm stub | STEP · STL |
| 1020-100 | 1020: 50.8 × 25.4 mm, slot 6.5 mm, 100 mm stub | STEP · STL |
| 1515-100 | 1515 (1.5 in, 15-series): 38.1 × 38.1 mm, slot 8.2 mm, 100 mm stub | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=t-slot-extrusions
Fits with
Questions
What is the slot width on 2020 extrusion?
6.0 mm opening (6.2 on V-slot) with a cavity about 11 mm wide and 6 mm deep behind 1.8 mm lips; the centre bore is Ø4.2 for an M5 tap.
What is the difference between 2020 and V-slot 2020?
Same 20 × 20 size and 6 mm-class slot; V-slot adds 45° chamfers on the slot lips so Delrin V-wheels ride in the groove. T-nuts fit both.
What size T-nut for 4040 extrusion?
8 mm slot: M6 or M8 T-nuts (M5 on the 20-series 6 mm slot; 1/4-20 on 80/20 10-series).
Is 2020 extrusion metric or inch?
Metric (20 mm). The inch equivalents are 80/20 10-series (1 in, 25.4 mm) and 15-series (1.5 in); their slots and bores differ, so brackets don't interchange.