# 2040 aluminum extrusion, 6 mm slot (20-series)

> What are the exact dimensions of 2040 aluminum extrusion?

- Category: Hardware › Framing
- Kind: Hardware
- Basis: Misumi 5 series, 6 mm slot, from Misumi's dimensioned drawing of this profile; every slot, lip, cavity, bore and outline number is the drawing's
- Page: https://xemstudio.com/objects/2040-aluminum-extrusion/ · JSON: https://xemstudio.com/api/geometry?object=2040-aluminum-extrusion · Plain text: https://xemstudio.com/objects/2040-aluminum-extrusion/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| width | height |
|---|---|
| 40.0 | 20.0 |

**Exact dimensions.** Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part.

## Notes

- 2040 aluminum extrusion, 6 mm slot (20-series): 20 × 40 mm, 6 slots on a 20 mm pitch (Misumi 5 series, 6 mm slot). Source: Misumi's dimensioned drawing of this profile. Files: STEP and STL at 100, 1000 mm with square ends, and a DXF of the exact cross-section (mm), the master to extrude to any length. The section is centred on the origin and extruded along +Z from z = 0.
- Slot: opening 6 mm, lip 2 mm thick at the opening, cavity 12 mm wide under the lips, 6 mm from the face to the cavity floor. Centre bore Ø4.2 mm per cell (the M5 tap drill).
- Cavity side walls: the cavity is 12 mm wide under the lips, then follows the diagonal webs (1.5 mm thick, stated) down to the floor; the webs lie on the cell diagonals (45°), as drawn. The web thickness is stated on this series' 2060, 2080 and 4040 drawings.
- The closed hollows between cells are drawn from the stated web (1.5 mm), core (8 mm square round each bore) and 2 mm face wall.
- Outer corners R1 (stated).
- Wrapping it: to make a part that fits around the bar, subtract the 1000 mm file (or extrude the DXF) from your solid; the outline is the drawing's 20 × 40 mm with no allowance, so open the pocket by your process's socket fit (see Mating features).
- Attachments: the 20-series (6 mm slot) T-nuts, end caps, feet, brackets, gussets, plates and slot covers are cut from these same numbers; the fit check (tools/asm_extrusion_fit.py) placed each one on this profile with zero overlap.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| slot opening | 6 | T-nut tongue, slot-cover stem (20-series (6 mm slot)) | slide | all |
| slot cavity | 12 wide under the lips, face to floor 6, lip 2 | T-nut body (slide-in, drop-in) | slide | all |
| centre bore | Ø4.2 | M5 thread (tap drill 4.2); end-cap pin | designed | all |
| outline | 20 × 40, R1 | end-cap outline, foot socket, a pocket that wraps the bar | socket | all |

## Sizes

| feature | size | from |
|---|---|---|
| outline | 20 × 40 mm, R1 corners | drawing |
| slot pitch | 20 mm | drawing |
| slot opening | 6 mm | drawing |
| lip thickness at the opening | 2 mm | drawing |
| cavity width under the lips | 12 mm | drawing |
| face to cavity floor | 6 mm | drawing |
| cavity depth under the lip (at the cavity wall) | 4 mm | drawing |
| core between opposite floors | 8 mm | pitch − 2 × face-to-floor |
| diagonal web | 1.5 mm | drawing |
| centre bore | Ø4.2 mm × 2 | drawing |
| cross-section area | 324 mm² | maker's page |
| mass | 0.88 kg/m | maker's page |
| Ix / Iy | 1.358 × 10⁴ / 5.13 × 10⁴ mm⁴ | maker's page |
| area of this model's section | 326.9 mm² | computed from the DXF |

## Where the files are

- Misumi: [20x40 Aluminum Extrusion - 5 Series, Base 20: product page with the cross-section drawing and section properties](https://us.misumi-ec.com/vona2/detail/110302684350/) — web — Misumi site terms (verify at link)
- Misumi: [2040 dimensioned cross-section drawing](https://us.misumi-ec.com/linked/item/10302684350/img/Picture3_new.jpg) — image — Misumi site terms (verify at link)

## Free STEP/STL (2 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/2040-aluminum-extrusion/index.json

- 2040-100: [STEP](https://xemstudio.com/files/hardware/2040-aluminum-extrusion/2040-100.step) · [STL](https://xemstudio.com/files/hardware/2040-aluminum-extrusion/2040-100.stl) · [DXF](https://xemstudio.com/files/hardware/2040-aluminum-extrusion/2040-section.dxf) — 2040 aluminum extrusion, 6 mm slot (20-series): 20 × 40 mm section, 100 mm long, square ends; DXF = the exact cross-section in mm
- 2040-1000: [STEP](https://xemstudio.com/files/hardware/2040-aluminum-extrusion/2040-1000.step) · [STL](https://xemstudio.com/files/hardware/2040-aluminum-extrusion/2040-1000.stl) · [DXF](https://xemstudio.com/files/hardware/2040-aluminum-extrusion/2040-section.dxf) — 2040 aluminum extrusion, 6 mm slot (20-series): 20 × 40 mm section, 1000 mm long, square ends; DXF = the exact cross-section in mm

## How it fits

### Parts that fit it
- [Slide-in T-nuts for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/slide-in-t-nuts/): tongue in the opening, body in the cavity (slide)
- [Drop-in T-nuts for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/drop-in-t-nuts/): drops through the opening, turns 90° in the cavity
- [L corner brackets for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/t-slot-corner-brackets/): legs flat on two profile faces at 90°
- [Inside corner gussets for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/t-slot-gussets/): legs on two profile faces in the inside corner
- [Snap-in slot covers for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion (100 mm)](https://xemstudio.com/objects/t-slot-covers/): stem in the slot opening, barb behind the lips
- [Joining plates, 2 × 3 holes, for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/t-slot-joining-plates/): holes over the slot centrelines on the profile pitch
- [End caps for every T-slot profile here (20, 30, 40, 45 mm and 1 in, 1.5 in series)](https://xemstudio.com/objects/t-slot-end-caps/): end-cap-20-2x1: pins in the centre bores (press)

### Alternatives
- [2020 aluminum extrusion, 6 mm slot (20-series)](https://xemstudio.com/objects/2020-aluminum-extrusion/): same 20-series (6 mm slot) slot, 20 × 20 mm
- [2060 aluminum extrusion, 6 mm slot (20-series)](https://xemstudio.com/objects/2060-aluminum-extrusion/): same 20-series (6 mm slot) slot, 20 × 60 mm
- [2080 aluminum extrusion, 6 mm slot (20-series)](https://xemstudio.com/objects/2080-aluminum-extrusion/): same 20-series (6 mm slot) slot, 20 × 80 mm

### Also needed
- [Button head socket screws, M2–M8 (ISO 7380)](https://xemstudio.com/objects/button-head-screws-metric/): M5 screws through brackets into the T-nuts

## Questions

**What is the slot size of 2040 extrusion?**

Opening 6 mm, lip 2 mm, cavity 12 mm wide under the lips and 6 mm deep from the face to the floor, per Misumi 5 series, 6 mm slot's drawing.

**What T-nuts fit 2040 extrusion?**

The 20-series (6 mm slot) nuts: slide-in (tnut-slide-20-m3, tnut-slide-20-m4, tnut-slide-20-m5) and drop-in versions, threaded M3, M4, M5 as tap-drill holes, cut to this slot's exact space.

**Can I subtract this file to make a part that fits the extrusion exactly?**

Yes: the outline is exactly 20 × 40 mm with R1 corners; extrude the DXF or subtract the 1000 mm STEP, then open the pocket by your fit.

**How heavy is 2040 extrusion?**

0.88 kg/m, 324 mm² section, as Misumi states.

**What in this model is not taken straight from the drawing?**

The closed hollows between cells are drawn from the stated web (1.5 mm), core (8 mm square round each bore) and 2 mm face wall.

## Fits with

- [2020 aluminum extrusion, 6 mm slot (20-series)](https://xemstudio.com/objects/2020-aluminum-extrusion/)
- [2060 aluminum extrusion, 6 mm slot (20-series)](https://xemstudio.com/objects/2060-aluminum-extrusion/)
- [2080 aluminum extrusion, 6 mm slot (20-series)](https://xemstudio.com/objects/2080-aluminum-extrusion/)
- [4040 aluminum extrusion, 6 mm slot (20-series, 2 × 2)](https://xemstudio.com/objects/4040-aluminum-extrusion-20-series/)
- [Slide-in T-nuts for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/slide-in-t-nuts/)
- [Drop-in T-nuts for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/drop-in-t-nuts/)
- [End caps for every T-slot profile here (20, 30, 40, 45 mm and 1 in, 1.5 in series)](https://xemstudio.com/objects/t-slot-end-caps/)
- [L corner brackets for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/t-slot-corner-brackets/)
- [Button head socket screws, M2–M8 (ISO 7380)](https://xemstudio.com/objects/button-head-screws-metric/)