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Drop-in T-nuts for 20, 30, 40 and 10-series (1 in) extrusion
What are drop-in T-nut dimensions for 2020 extrusion? · Hardware · basis: Drop-in nut: width = slot opening so it passes the opening, length = cavity − 1 so it turns 90° (designed), tap-drill thread hole
Long Earth Society build part. Brackets and feet on the LES 2020 test stands; motor and bearing mounts hang off these. The engines
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. Mating features
- sizes
- 4 in table
Notes
- The nut is as wide as the slot opening, so it drops in through the face, and 1 mm shorter than the cavity width, so it turns 90° to lock behind the lips (designed).
- 20-series: 10 × 6 × 4.2 body with a 6 × 6 × 1.8 boss, M3 / M4 / M5. 30-series: 15.5 × 8 × 6, boss 8 × 8 × 2.5, M5 / M6 / M8. 40-series: 19 × 8 × 6.5, boss 8 × 8 × 3, M6 / M8. 10-series: 13.4 × 6.5 × 4.8, boss 6.5 × 6.5 × 2.3, 1/4-20 / 10-32.
- Thread holes are the standard tap drills (M3 2.5, M4 3.3, M5 4.2, M6 5.0, M8 6.8, 1/4-20 5.1, 10-32 4.0); body edges carry a 1.2 mm chamfer.
- Use a drop-in nut where the profile end is already closed.
Sizes
| series | body_mm | boss_mm | threads |
|---|---|---|---|
| 20 | 10 × 6 × 4.2 | 6 × 6 × 1.8 | M3, M4, M5 |
| 30 | 15.5 × 8 × 6 | 8 × 8 × 2.5 | M5, M6, M8 |
| 40 | 19 × 8 × 6.5 | 8 × 8 × 3 | M6, M8 |
| 10 (1 in) | 13.4 × 6.5 × 4.8 | 6.5 × 6.5 × 2.3 | 1/4-20, 10-32 |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance; leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| 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-* |
| drop-in T-nut width | slot opening | passes through the opening | slide | tnut-dropin-* |
| drop-in T-nut length | cavity − 1 | turns 90° in the cavity | designed | tnut-dropin-* |
| 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 |
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 10 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| tnut-dropin-20-m3 | drop-in T-nut, 20-series slot: 10 × 6 × 4.2 body, 6 tongue (exact to the opening), M3 tap-drill hole Ø2.5 | STEP · STL |
| tnut-dropin-20-m4 | drop-in T-nut, 20-series slot: 10 × 6 × 4.2 body, 6 tongue (exact to the opening), M4 tap-drill hole Ø3.3 | STEP · STL |
| tnut-dropin-20-m5 | drop-in T-nut, 20-series slot: 10 × 6 × 4.2 body, 6 tongue (exact to the opening), M5 tap-drill hole Ø4.2 | STEP · STL |
| tnut-dropin-30-m5 | drop-in T-nut, 30-series slot: 15.5 × 8 × 6 body, 8 tongue (exact to the opening), M5 tap-drill hole Ø4.2 | STEP · STL |
| tnut-dropin-30-m6 | drop-in T-nut, 30-series slot: 15.5 × 8 × 6 body, 8 tongue (exact to the opening), M6 tap-drill hole Ø5 | STEP · STL |
| tnut-dropin-30-m8 | drop-in T-nut, 30-series slot: 15.5 × 8 × 6 body, 8 tongue (exact to the opening), M8 tap-drill hole Ø6.8 | STEP · STL |
| tnut-dropin-40-m6 | drop-in T-nut, 40-series slot: 19 × 8 × 6.5 body, 8 tongue (exact to the opening), M6 tap-drill hole Ø5 | STEP · STL |
| tnut-dropin-40-m8 | drop-in T-nut, 40-series slot: 19 × 8 × 6.5 body, 8 tongue (exact to the opening), M8 tap-drill hole Ø6.8 | STEP · STL |
| tnut-dropin-10in-1-4-20 | drop-in T-nut, 10in-series slot: 13.4 × 6.5 × 4.8 body, 6.5 tongue (exact to the opening), 1/4-20 tap-drill hole Ø5.1 | STEP · STL |
| tnut-dropin-10in-10-32 | drop-in T-nut, 10in-series slot: 13.4 × 6.5 × 4.8 body, 6.5 tongue (exact to the opening), 10-32 tap-drill hole Ø4 | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=drop-in-t-nuts
How it fits
Goes in or on
Aluminium T-slot extrusionpasses the slot opening, turns 90° in the cavityConnects to
Button head socket screws, M2–M8screw into the tap-drill holeAlternatives
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Questions
What is a drop-in T-nut for 2020?
A 10 × 6 × 4.2 mm nut that passes the 6 mm opening and turns 90° in the 11 mm cavity.
Why is the drop-in nut 1 mm shorter than the cavity?
So it can rotate 90° inside the slot; it is a designed gap.