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T-slot attachments: slide-in and drop-in T-nuts, corner brackets, gussets, end caps, slot covers, feet, hole plates
What are 2020 T-nut dimensions and how do I design a bracket for aluminium extrusion? · Hardware · basis: Sized to the profile entry: 20-series (6 mm slot, M5), 30-series (8 mm, M6/M8), 40-series (8 mm), 80/20 10-series (0.256 in, 1/4-20); T-nut envelopes match the common steel ones
Long Earth Society build part. Brackets and feet on the LES 2020 test stands; motor and bearing mounts hang off these. The engines · all LES parts
- sizes
- 7 in table
Notes
- Slide-in T-nut, 20-series: 10 × 10 × 4.5 mm body with a 5.6 mm tongue; drop-in: 10 × 5.6 × 4.5, rotates 90° in the slot. 30/40-series: 15.5 × 15.5 × 6.5 and 15.5 × 7.6 drop-in. Steel nuts are stronger; printed ones (PETG, M3/M4) hold light fixtures and are the pattern for the bracket pocket.
- Bracket rule: a flat face, a tongue 5.8 mm wide (6 mm slot) × 1.5 mm proud to stop rotation, and a slot (not a hole) along the extrusion so it slides to position. 20 mm L-bracket with two slots and side gussets carries a NEMA 17; the inside gusset makes a 90° frame joint square.
- End caps press pins into the centre bores (Ø4.2 + 0.15 on 20-series). Slot covers snap into the 6 mm opening and hide wiring. Feet take an M5 into the bore. Plates on the slot pitch give you a mounting grid.
- Everything is parametrized from the extrusion sheet; scale the 20-series parts by 1.5 for 30, by 2 for 40 only where the slot width allows (it doesn't: 30/40 share the 8 mm slot, so the tongue stays 7.8).
Sizes
| part | 20-series | 30-series | 40-series | 10-series (in) |
|---|---|---|---|---|
| slide-in T-nut | 10 × 10 × 4.5, M3–M5 | 15.5 × 15.5 × 6.5, M5–M8 | 19 × 19 × 7, M6/M8 | 12.7 × 13.4 × 4.8, 1/4-20 |
| drop-in T-nut | 10 × 5.6 × 4.5 | 15.5 × 7.6 × 6.5 | 19 × 7.6 × 7 | 13.4 × 6.1 × 4.8 |
| corner bracket | 20 × 20 × 20, 3 thick | 30 × 30 × 30, 4.5 | 40 × 40 × 40, 6 | 25.4 cube, 4 |
| gusset | 20 × 20 | 30 × 30 | 40 × 40 | 25.4 |
| end cap pins | Ø4.35 | Ø6.95 | Ø6.95 | Ø5.25 |
| slot cover | 6 mm | 8 mm | 8 mm | 6.5 mm |
| screws | M5 button, M4/M3 with printed nuts | M6 / M8 | M8 | 1/4-20 BHCS |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | T-slot nut | web | CC BY-SA 4.0 (text) |
| OpenBuilds | Tee nuts and brackets for V-slot | web, STEP | OpenBuilds site verify |
| Long Earth Society | Engine and rig builds on extrusion frames | web, video | LES site |
Free files
★ Free files 46 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| tnut-slide-20-m3 | slide-in T-nut, 20-series slot, M3 (thread as plain hole; print and tap, or use as a pattern for steel) | STEP · STL |
| tnut-dropin-20-m3 | drop-in T-nut, 20-series slot, M3 | STEP · STL |
| tnut-slide-20-m4 | slide-in T-nut, 20-series slot, M4 (thread as plain hole; print and tap, or use as a pattern for steel) | STEP · STL |
| tnut-dropin-20-m4 | drop-in T-nut, 20-series slot, M4 | STEP · STL |
| tnut-slide-20-m5 | slide-in T-nut, 20-series slot, M5 (thread as plain hole; print and tap, or use as a pattern for steel) | STEP · STL |
| tnut-dropin-20-m5 | drop-in T-nut, 20-series slot, M5 | STEP · STL |
| tnut-slide-30-m5 | slide-in T-nut, 30-series slot, M5 (thread as plain hole; print and tap, or use as a pattern for steel) | STEP · STL |
| tnut-dropin-30-m5 | drop-in T-nut, 30-series slot, M5 | STEP · STL |
| tnut-slide-30-m6 | slide-in T-nut, 30-series slot, M6 (thread as plain hole; print and tap, or use as a pattern for steel) | STEP · STL |
| tnut-dropin-30-m6 | drop-in T-nut, 30-series slot, M6 | STEP · STL |
| tnut-slide-30-m8 | slide-in T-nut, 30-series slot, M8 (thread as plain hole; print and tap, or use as a pattern for steel) | STEP · STL |
| tnut-dropin-30-m8 | drop-in T-nut, 30-series slot, M8 | STEP · STL |
| tnut-slide-40-m6 | slide-in T-nut, 40-series slot, M6 (thread as plain hole; print and tap, or use as a pattern for steel) | STEP · STL |
| tnut-dropin-40-m6 | drop-in T-nut, 40-series slot, M6 | STEP · STL |
| tnut-slide-40-m8 | slide-in T-nut, 40-series slot, M8 (thread as plain hole; print and tap, or use as a pattern for steel) | STEP · STL |
| tnut-dropin-40-m8 | drop-in T-nut, 40-series slot, M8 | STEP · STL |
| tnut-slide-10in-1-4-20 | slide-in T-nut, 10in-series slot, 1/4-20 (thread as plain hole; print and tap, or use as a pattern for steel) | STEP · STL |
| tnut-dropin-10in-1-4-20 | drop-in T-nut, 10in-series slot, 1/4-20 | STEP · STL |
| tnut-slide-10in-10-32 | slide-in T-nut, 10in-series slot, 10-32 (thread as plain hole; print and tap, or use as a pattern for steel) | STEP · STL |
| tnut-dropin-10in-10-32 | drop-in T-nut, 10in-series slot, 10-32 | STEP · STL |
| corner-bracket-20 | 20-series L corner bracket 20 × 20, two slots, side gussets | STEP · STL |
| gusset-20 | 20-series inside corner gusset | STEP · STL |
| slot-cover-20-100 | 20-series snap-in slot cover, 100 mm | STEP · STL |
| foot-20 | 20-series end foot / leveling pad, bore screw | STEP · STL |
| plate-20-2x3 | 20-series 2 × 3 hole plate on 20 mm pitch, 5 thick | STEP · STL |
| corner-bracket-30 | 30-series L corner bracket 30 × 30, two slots, side gussets | STEP · STL |
| gusset-30 | 30-series inside corner gusset | STEP · STL |
| slot-cover-30-100 | 30-series snap-in slot cover, 100 mm | STEP · STL |
| foot-30 | 30-series end foot / leveling pad, bore screw | STEP · STL |
| plate-30-2x3 | 30-series 2 × 3 hole plate on 30 mm pitch, 5 thick | STEP · STL |
| corner-bracket-40 | 40-series L corner bracket 40 × 40, two slots, side gussets | STEP · STL |
| gusset-40 | 40-series inside corner gusset | STEP · STL |
| slot-cover-40-100 | 40-series snap-in slot cover, 100 mm | STEP · STL |
| foot-40 | 40-series end foot / leveling pad, bore screw | STEP · STL |
| plate-40-2x3 | 40-series 2 × 3 hole plate on 40 mm pitch, 5 thick | STEP · STL |
| corner-bracket-10in | 10in-series L corner bracket 25.4 × 25.4, two slots, side gussets | STEP · STL |
| gusset-10in | 10in-series inside corner gusset | STEP · STL |
| slot-cover-10in-100 | 10in-series snap-in slot cover, 100 mm | STEP · STL |
| foot-10in | 10in-series end foot / leveling pad, bore screw | STEP · STL |
| plate-10in-2x3 | 10in-series 2 × 3 hole plate on 25.4 mm pitch, 5 thick | STEP · STL |
| end-cap-20-1x1 | 20-series end cap, 1 × 1 cells, press pins into the bores | STEP · STL |
| end-cap-20-2x1 | 20-series end cap, 2 × 1 cells, press pins into the bores | STEP · STL |
| end-cap-20-4x1 | 20-series end cap, 4 × 1 cells, press pins into the bores | STEP · STL |
| end-cap-30-1x1 | 30-series end cap, 1 × 1 cells, press pins into the bores | STEP · STL |
| end-cap-40-1x1 | 40-series end cap, 1 × 1 cells, press pins into the bores | STEP · STL |
| end-cap-10in-1x1 | 10in-series end cap, 1 × 1 cells, press pins into the bores | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=t-slot-brackets-and-nuts
Fits with
Questions
What are 2020 T-nut dimensions?
Slide-in: about 10 × 10 mm, 4.5 mm thick with a 5.6 mm wide tongue; drop-in: 10 × 5.6 × 4.5 mm so it passes the 6 mm slot and turns to lock. Threads M3, M4 or M5.
How do I design a bracket that attaches to 2020 extrusion?
Flat face on the extrusion, a 5.8 mm wide tongue 1.5 mm proud in the slot to stop rotation, and a slotted hole for an M5 button head into a T-nut; keep 2 mm of wall around the slot.
Can I 3D print T-nuts?
For light loads, yes in PETG with an M3/M4 tapped hole or a heat-set insert; for anything structural use steel nuts and the printed ones only as pocket patterns.