# Inside corner gussets for 20, 30, 40 and 10-series extrusion

> What size gusset for a 2020 extrusion inside corner?

- Category: Hardware › Framing
- Kind: Hardware
- Basis: Inside corner gusset: legs the profile size × 0.8 profile tall, triangular web, one ISO 273 clearance hole per leg
- Page: https://xemstudio.com/objects/t-slot-gussets/ · JSON: https://xemstudio.com/api/geometry?object=t-slot-gussets · Plain text: https://xemstudio.com/objects/t-slot-gussets/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 gusset has two legs as long as the profile is wide and 0.8 × that tall, joined by a triangular web at mid-height.
- Legs are 3 mm thick on 20-series and 4 mm on 30, 40 and 10-series: 20 × 16 × 3, 30 × 24 × 4, 40 × 32 × 4, 25.4 × 20.32 × 4 mm.
- Each leg has one hole 0.6 × profile from the corner and 0.4 × profile up: Ø5.5 (M5), Ø6.6 (M6), Ø9 (M8), Ø7.14 (1/4-20).

## 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 |

## Sizes

| series | leg_mm | thickness_mm | hole_mm | screw |
|---|---|---|---|---|
| 20 | 20 × 16 | 3 | 5.5 | M5 |
| 30 | 30 × 24 | 4 | 6.6 | M6 |
| 40 | 40 × 32 | 4 | 9 | M8 |
| 10 (1 in) | 25.4 × 20.32 | 4 | 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-gussets/index.json

- gusset-20: [STEP](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/gusset-20.step) · [STL](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/gusset-20.stl) — 20-series inside corner gusset, 2 × Ø5.5 (M5 clearance)
- gusset-30: [STEP](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/gusset-30.step) · [STL](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/gusset-30.stl) — 30-series inside corner gusset, 2 × Ø6.6 (M6 clearance)
- gusset-40: [STEP](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/gusset-40.step) · [STL](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/gusset-40.stl) — 40-series inside corner gusset, 2 × Ø9 (M8 clearance)
- gusset-10in: [STEP](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/gusset-10in.step) · [STL](https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/gusset-10in.stl) — 10in-series inside corner gusset, 2 × Ø7.14 (1/4-20 clearance)

## 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/): legs on two profile faces in the inside corner

### Alternatives
- [L corner brackets for 20, 30, 40 and 10-series extrusion](https://xemstudio.com/objects/t-slot-corner-brackets/): L bracket

### Also needed
- [Slide-in T-nuts for 20, 30, 40 and 10-series (1 in) extrusion](https://xemstudio.com/objects/slide-in-t-nuts/): screw through each leg hole into a T-nut

## Questions

**What screw for a 2020 gusset?**

M5 through each Ø5.5 hole into a T-nut.

**What is the difference between a gusset and a corner bracket?**

The gusset sits in the inside corner with a triangular web; the corner bracket is an L with side gussets.

## Fits with

- [L corner brackets for 20, 30, 40 and 10-series extrusion](https://xemstudio.com/objects/t-slot-corner-brackets/)
- [Slide-in T-nuts for 20, 30, 40 and 10-series (1 in) extrusion](https://xemstudio.com/objects/slide-in-t-nuts/)
- [2 × 3 hole joining plates for 20, 30, 40 and 10-series extrusion](https://xemstudio.com/objects/t-slot-joining-plates/)
- [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/)