# Extrusion end feet for 20, 30, 40 and 10-series

> How do I put a foot on the end of 2020 extrusion?

- Category: Hardware › Framing
- Kind: Hardware
- Basis: Square foot 1.6 × the profile, socket = profile outline (exact) 3 deep, clearance hole for a screw into the centre bore
- Page: https://xemstudio.com/objects/t-slot-feet/ · JSON: https://xemstudio.com/api/geometry?object=t-slot-feet · Plain text: https://xemstudio.com/objects/t-slot-feet/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

- Each foot is a 6 mm thick square 1.6 × the profile size with R4 corners, a socket the exact profile outline 3 mm deep, a clearance hole for the screw into the profile's centre bore, and a recess the profile's width in diameter, 1.5 mm deep, underneath.
- 20-series: 32 × 32, Ø5.5 for M5. 30-series: 48 × 48, Ø9 for M8. 40-series: 64 × 64, Ø9 for M8. 10-series: 40.64 × 40.64, Ø7.14 for 1/4-20.
- The screw threads into the profile's centre bore (M5 on 20-series, M8 on 30 and 40).

## 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 |
|---|---|---|---|---|
| bracket / gusset / plate screw holes | Ø5.5 / 6.6 / 9.0 / 7.14 | M5 / M6 / M8 / 1/4-20 clearance | designed | all |
| foot socket | profile outline (20 / 30 / 40 / 25.4) | profile end | socket | foot-* |
| foot screw hole | Ø5.5 / 9.0 / 9.0 / 7.14 | M5 / M8 / M8 / 1/4-20 into the centre bore | designed | foot-* |

## Sizes

| series | foot_mm | socket_mm | hole_mm | screw |
|---|---|---|---|---|
| 20 | 32 | 20 × 20 × 3 | 5.5 | M5 |
| 30 | 48 | 30 × 30 × 3 | 9 | M8 |
| 40 | 64 | 40 × 40 × 3 | 9 | M8 |
| 10 (1 in) | 40.64 | 25.4 × 25.4 × 3 | 7.14 | 1/4-20 |

## 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 (4 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/t-slot-feet/index.json

- foot-20: [STEP](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/foot-20.step) · [STL](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/foot-20.stl) — 20-series end foot: 20 × 20 socket for the profile end (exact), Ø5.5 clearance for an M5 into the centre bore
- foot-30: [STEP](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/foot-30.step) · [STL](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/foot-30.stl) — 30-series end foot: 30 × 30 socket for the profile end (exact), Ø9 clearance for an M8 into the centre bore
- foot-40: [STEP](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/foot-40.step) · [STL](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/foot-40.stl) — 40-series end foot: 40 × 40 socket for the profile end (exact), Ø9 clearance for an M8 into the centre bore
- foot-10in: [STEP](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/foot-10in.step) · [STL](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/foot-10in.stl) — 10in-series end foot: 25.4 × 25.4 socket for the profile end (exact), Ø7.14 clearance for an 1/4-20 into the centre bore

## 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/): profile end in the socket (socket fit)

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

### Alternatives
- [End caps for 20, 30, 40 and 10-series extrusion (1, 2 and 4 cells)](https://xemstudio.com/objects/t-slot-end-caps/): a plain cap where no foot is needed

## Questions

**What screw holds a foot on 2020 extrusion?**

An M5 through the Ø5.5 hole into the tapped 4.2 mm centre bore.

**How deep is the socket?**

3 mm, at the exact profile outline.

## Fits with

- [End caps for 20, 30, 40 and 10-series extrusion (1, 2 and 4 cells)](https://xemstudio.com/objects/t-slot-end-caps/)
- [Slide-in T-nuts for 20, 30, 40 and 10-series (1 in) extrusion](https://xemstudio.com/objects/slide-in-t-nuts/)
- [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/)