The hardware store never has the size you need. Set inner diameter, outer diameter and thickness — from a 0.4 mm shim to a 30 mm standoff — and print exactly the washer or spacer the assembly calls for.
The real generator runs in your browser: set the parameters, then download STEP or STL. Nothing to install, no sign-up.
The first open downloads the CAD engine (about 20 MB).
Each parameter below rebuilds real geometry on every change — this is parametric CAD, not a scaled mesh.
| Parameter | Default | Range | What it does |
|---|---|---|---|
| Inner diameterINNER_D | 8.4 mm | 2 – 60 | Bolt clearance: M8 → 8.4 mm. |
| Outer diameterOUTER_D | 24 mm | 6 – 120 | Overall washer diameter. |
| ThicknessTHICKNESS | 3 mm | 0.4 – 30 | From shim-thin to tall spacer tube. |
| Edge chamferCHAMFER | 0.4 mm | 0 – 2 | Eases insertion and kills elephant-foot. |
Every parameter can go in the page's link, so one link opens exactly the part you want. Example (M5 spacer: 5.3 mm hole, 12 mm across, 2 mm thick):https://www.forgent3d.com/en/generators/washer-spacer-generator?INNER_D=5.3&OUTER_D=12&THICKNESS=2
STEP AP214 in millimetres, exact B-rep — it opens directly in SolidWorks, Fusion, FreeCAD, Onshape or Inventor, and goes straight into a CNC quote form. STL for the slicer is one click too.
| This generator | Typical online STL generator | Vendor CAD library | |
|---|---|---|---|
| Any size within the range | Yes | Yes | Catalog sizes only |
| STEP with exact surfaces | Yes | Usually an STL mesh only | Yes |
| Changes the sliders don't cover | “AI edit” on the page | No | No |
| Account needed to download | No | Usually no | Often |
Every parameter is a link parameter; the link below opens the example part. ChatGPT, Claude or any assistant can write one like it from the parameter list (names, units, ranges) at: parameter list (JSON)
Example: https://www.forgent3d.com/en/generators/washer-spacer-generator?INNER_D=5.3&OUTER_D=12&THICKNESS=2
Press “AI edit” in the generator and say what to change — a keyway, holes, a different shape. The AI edits the part's model.py and it rebuilds in your browser, with undo. A few edits a day are free without signing in; to keep the result or go further, copy it into your models and continue with the AI agent.
Edit with AI →For bigger changes, several rounds, or a part you want to keep: copy it into your models (free account). The Forgent3D AI agent reads the model.py, edits it, rebuilds it and checks the result itself.
Copy and continue with the AI agent →Standard flat washers (ISO 7089) use the fine clearance series of ISO 273: M3 → 3.2, M4 → 4.3, M5 → 5.3, M6 → 6.4, M8 → 8.4, M10 → 10.5 mm. For an easier fit, take the medium series: M3 → 3.4, M4 → 4.5, M5 → 5.5, M6 → 6.6, M8 → 9, M10 → 11 mm.
Under a bolt head in static assemblies, absolutely — PETG at 100% infill handles typical clamping loads. Avoid printed washers where temperature, creep under sustained high torque, or electrical conduction matters.
Thickness lands on layer multiples: at 0.2 mm layers a 3 mm spacer is exact. For sub-layer precision (e.g. a 1.1 mm shim), print at 0.1 mm layers or ask the agent for a stack of test thicknesses.
Open https://www.forgent3d.com/en/generators/washer-spacer-generator?INNER_D=5.3&OUTER_D=12&THICKNESS=2 — 5.3 mm is the bore of a standard M5 washer (ISO 7089) — then download STL to print it, or STEP for a machinist.
Yes. Press “AI edit” in the generator and describe it (“six 3 mm holes on a 22 mm circle”). The AI changes the washer’s model.py on the page, and the new sizes become parameters you can keep turning. A few edits a day are free without signing in.
Yes. Models you generate and the STL / STEP files you export are yours: print them, sell the prints, or use them in a product. No attribution to Forgent3D is required.
Already have your own .scad file? Convert OpenSCAD to STEP → · Preview it in the browser →
