Open the 3D-Printable Screw Thread Generator
Create 3D-printable ISO metric (M3–M24) and trapezoidal (Tr) threads: bolts with hex or socket heads, nuts, threaded rods and bolt+nut pairs.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
An M8 × 1.25 bolt, 20 mm long with a 13 mm hex head and 0.15 mm clearance has a 7.7 mm major diameter, a thread depth of 0.77 mm and about 10,000 triangles at standard quality; the matching M8 nut is 6.8 mm tall with 13 mm across flats.Open the 3D-Printable Screw Thread Generator
Illustration. Open the tool for the real thing.
What is the 3D-Printable Screw Thread Generator?
Printing your own bolts, nuts, knobs and lead screws is easy when the geometry is right — and hard when a thread from the internet is too tight, too loose or not watertight. This generator builds threads from the exact ISO 261/262 basic profile (60°, crest flat P/8, thread depth 0.6134 P on the bolt and 0.5413 P in the nut) or a 30° trapezoidal (Tr) profile with root clearance following DIN 103, for any diameter, pitch and length, right- or left-handed. Pick a standard size from M2 to M24 and the pitch, head and nut dimensions fill in from ISO 4017, 4032 and 4762 tables, or enter a custom size.
The part is built as a single closed, outward-facing triangle mesh — thread surface, end faces and head — so it slices cleanly. A printer clearance (radial, per side) makes the bolt slightly smaller and the nut slightly larger so they thread together; 0.15 mm is a good FDM starting point. You can generate a bolt with a hex, socket-cap or round head, a hex, round or scalloped thumb nut, a threaded rod or lead screw, or a bolt and nut pair laid out together, with chamfered ends so the thread starts easily. Download STL, 3MF, OBJ or PLY.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
ISO metric 60° and trapezoidal 30° threads, right or left hand.
Hex, socket-cap or round heads; hex, round or scalloped nuts.
Per-side clearance so printed parts actually thread together.
Single watertight mesh checked in the page before download.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
How it compares
A plain look at this tool next to the usual alternative.
| This maker tool | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
Do printed nuts fit steel bolts?
Often with +0.2 mm clearance, but use the nut-only option and print a test.
Which pitches work best on FDM?
Coarse pitches (M6 and up) and trapezoidal threads.
Is the mesh watertight?
Yes — a single closed manifold, verified in the page.
Is it private?
Yes, nothing is uploaded.
How do I use the 3D-Printable Screw Thread Generator?
1. Choose the part and a standard size (or custom diameter and pitch). 2. Set the length, clearance and head or nut style. 3. Check the 3D preview and the watertight check. 4. Download and print upright with 0.12–0.2 mm layers.
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Try the 3D-Printable Screw Thread Generator now
Generate metric (ISO) and trapezoidal threads: bolts, nuts and threaded rods as. Free to use.
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