# Slide-in T-nuts for 20, 30, 40 and 10-series (1 in) extrusion

> What are 2020 T-nut dimensions?

- Category: Hardware › Framing
- Kind: Hardware
- Basis: Drawn exact to the slot: body = cavity width × depth under the lips, tongue = slot opening × lip; threads as standard tap-drill holes
- Page: https://xemstudio.com/objects/slide-in-t-nuts/ · JSON: https://xemstudio.com/api/geometry?object=slide-in-t-nuts · Plain text: https://xemstudio.com/objects/slide-in-t-nuts/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

**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

- The body is the slot cavity's width by the depth under the lips, and the tongue on top is the slot opening by the lip thickness, running the nut's full length; none has clearance drawn in.
- 20-series: 11 × 11 × 4.2 body, 6 × 1.8 tongue, 6 mm overall, M3 / M4 / M5. 30-series: 16.5 × 16.5 × 6, tongue 8 × 2.5, M5 / M6 / M8. 40-series: 20 × 20 × 6.5, tongue 8 × 3, M6 / M8. 10-series: 14.4 × 14.4 × 4.8, tongue 6.5 × 2.3, 1/4-20 / 10-32.
- The thread hole is the standard tap drill: M3 2.5, M4 3.3, M5 4.2, M6 5.0, M8 6.8, 1/4-20 5.1, 10-32 4.0.
- A slide-in nut enters from the end of the profile; the body edges carry a 0.8 mm chamfer.

## 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 |
|---|---|---|---|---|
| slide-in T-nut body | cavity width × (depth − lip), e.g. 11 × 4.2 on 20-series | slot cavity | slide | tnut-slide-* |
| T-nut tongue | slot opening × lip (6.0 × 1.8 on 20-series; 8.0 on 30/40; 6.5 on 10-series) | slot opening | slide | tnut-* |
| T-nut thread hole | tap drill (M3 2.5 … M8 6.8, 1/4-20 5.1, 10-32 4.0) | screw thread | designed | tnut-* |
| bracket / gusset / plate screw holes | Ø5.5 / 6.6 / 9.0 / 7.14 | M5 / M6 / M8 / 1/4-20 clearance | designed | all |

## Sizes

| series | body_mm | tongue_mm | overall_h_mm | threads |
|---|---|---|---|---|
| 20 | 11 × 11 × 4.2 | 6 × 1.8 | 6.0 | M3, M4, M5 |
| 30 | 16.5 × 16.5 × 6 | 8 × 2.5 | 8.5 | M5, M6, M8 |
| 40 | 20 × 20 × 6.5 | 8 × 3 | 9.5 | M6, M8 |
| 10 (1 in) | 14.4 × 14.4 × 4.8 | 6.5 × 2.3 | 7.1 | 1/4-20, 10-32 |

## Where the files are

- Wikipedia: [T-slot nut](https://en.wikipedia.org/wiki/T-slot_nut) — web — CC BY-SA 4.0 (text)
- OpenBuilds: [Tee nuts and brackets for V-slot](https://openbuildspartstore.com/) — web, STEP — OpenBuilds site (verify at link)
- Long Earth Society: [Engine and rig builds on extrusion frames](https://longearthsociety.com/engineering/) — web, video — LES site

## Free STEP/STL (10 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/slide-in-t-nuts/index.json

- tnut-slide-20-m3: [STEP](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-20-m3.step) · [STL](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-20-m3.stl) — slide-in T-nut, 20-series slot: body 11 × 11 × 4.2, tongue 6 × 1.8 (exact to the slot), M3 tap-drill hole Ø2.5
- tnut-slide-20-m4: [STEP](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-20-m4.step) · [STL](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-20-m4.stl) — slide-in T-nut, 20-series slot: body 11 × 11 × 4.2, tongue 6 × 1.8 (exact to the slot), M4 tap-drill hole Ø3.3
- tnut-slide-20-m5: [STEP](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-20-m5.step) · [STL](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-20-m5.stl) — slide-in T-nut, 20-series slot: body 11 × 11 × 4.2, tongue 6 × 1.8 (exact to the slot), M5 tap-drill hole Ø4.2
- tnut-slide-30-m5: [STEP](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-30-m5.step) · [STL](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-30-m5.stl) — slide-in T-nut, 30-series slot: body 16.5 × 16.5 × 6, tongue 8 × 2.5 (exact to the slot), M5 tap-drill hole Ø4.2
- tnut-slide-30-m6: [STEP](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-30-m6.step) · [STL](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-30-m6.stl) — slide-in T-nut, 30-series slot: body 16.5 × 16.5 × 6, tongue 8 × 2.5 (exact to the slot), M6 tap-drill hole Ø5
- tnut-slide-30-m8: [STEP](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-30-m8.step) · [STL](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-30-m8.stl) — slide-in T-nut, 30-series slot: body 16.5 × 16.5 × 6, tongue 8 × 2.5 (exact to the slot), M8 tap-drill hole Ø6.8
- tnut-slide-40-m6: [STEP](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-40-m6.step) · [STL](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-40-m6.stl) — slide-in T-nut, 40-series slot: body 20 × 20 × 6.5, tongue 8 × 3 (exact to the slot), M6 tap-drill hole Ø5
- tnut-slide-40-m8: [STEP](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-40-m8.step) · [STL](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-40-m8.stl) — slide-in T-nut, 40-series slot: body 20 × 20 × 6.5, tongue 8 × 3 (exact to the slot), M8 tap-drill hole Ø6.8
- tnut-slide-10in-1-4-20: [STEP](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-10in-1-4-20.step) · [STL](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-10in-1-4-20.stl) — slide-in T-nut, 10in-series slot: body 14.4 × 14.4 × 4.8, tongue 6.5 × 2.3 (exact to the slot), 1/4-20 tap-drill hole Ø5.1
- tnut-slide-10in-10-32: [STEP](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-10in-10-32.step) · [STL](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/tnut-slide-10in-10-32.stl) — slide-in T-nut, 10in-series slot: body 14.4 × 14.4 × 4.8, tongue 6.5 × 2.3 (exact to the slot), 10-32 tap-drill hole Ø4

## How it fits

### Goes in or on
- [Aluminium T-slot extrusion: 2020, 2040, 2060, 2080, V-slot, 3030, 3060, 4040, 4080, 1010, 1515](https://xemstudio.com/objects/t-slot-extrusions/): body in the slot cavity, tongue in the opening (slide)

### Connects to
- [Button head socket screws, M2–M8 (ISO 7380)](https://xemstudio.com/objects/button-head-screws-metric/): screw into the tap-drill hole

### Alternatives
- [Drop-in T-nuts for 20, 30, 40 and 10-series (1 in) extrusion](https://xemstudio.com/objects/drop-in-t-nuts/): drop in from the face instead of the end

## Questions

**What are 2020 T-nut dimensions?**

Slide-in: 11 × 11 × 4.2 mm body with a 6.0 × 1.8 tongue, 6 mm tall overall, threaded M3, M4 or M5 as tap-drill holes.

**Are the printable T-nuts drawn with clearance?**

No; body and tongue equal the slot's sizes, and the Mating features list the faces that meet the slot and their fit.

**What thread for an 8020 10-series T-nut?**

1/4-20 (5.1 mm tap drill) or 10-32 (4.0 mm).

## Fits with

- [Drop-in T-nuts for 20, 30, 40 and 10-series (1 in) extrusion](https://xemstudio.com/objects/drop-in-t-nuts/)
- [L corner brackets for 20, 30, 40 and 10-series extrusion](https://xemstudio.com/objects/t-slot-corner-brackets/)
- [T-slot tongue gauge 5.6 / 5.8 / 6.0 mm (6 mm slot)](https://xemstudio.com/objects/extrusion-tongue-gauge/)
- [Aluminium T-slot extrusion: 2020, 2040, 2060, 2080, V-slot, 3030, 3060, 4040, 4080, 1010, 1515](https://xemstudio.com/objects/t-slot-extrusions/)
- [2020 aluminum extrusion](https://xemstudio.com/objects/2020-extrusion/)
- [Button head socket screws, M2–M8 (ISO 7380)](https://xemstudio.com/objects/button-head-screws-metric/)