Parametric Screw Generator
Generate parametric screws, nuts, and washers with 26 standard sizes, 8 head styles, and split print mode. Export STL for 3D printing.
What Is a Parametric Screw Generator?
A parametric screw generator is an online tool that builds threaded fastener models — screws, nuts, and washers — from standard size specifications. This screw generator covers M2 through M20 metric sizes and #4 through 3/4 imperial sizes, totaling 26 specs.
All geometry is rendered directly in your browser using a background thread. Select a spec, configure head type, drive, and thread options, click Generate Model, then export the result as a binary STL file.
Screw Generator Parameters
| Parameter | Range | Description |
|---|---|---|
| Spec | 26 sizes | M2–M20 metric and #4–3/4 imperial standard sizes. |
| Thread | 4 options | Coarse, fine, custom pitch, or none (smooth shaft). |
| Screw Length | ≥ 2 mm | Overall screw body length in millimeters. |
| Screw Head | 8 styles | None, flat, button, socket, ribbed socket, hex, pan, or cheese. |
| Screw Drive | 4 families | Hex, slot, phillips (PH1–PH4), and torx (T10–T25). |
| Undersize | ≥ 0 mm | Shrink screw diameter for thread tolerance control. |
| Split Print | On / Off | Splits the screw horizontally for stronger layer orientation. |
| Nut Shape | 2 types | Hex or square nut body. |
| Nut Thickness | 5 options | Thin, normal, thick, DIN standard, or custom value. |
| Nut Bevel | 5 options | Auto, none, inside, outside, or both edges beveled. |
| Washer | 2 sizes | Regular or large outer diameter, with optional chamfer. |
| Resolution | 1–4 | Higher values produce smoother threads and geometry. |
How to Use the Screw Generator
- Choose a spec from the dropdown — metric M2–M20 or imperial #4–3/4.
- Select a thread type (coarse, fine, custom pitch, or none for a smooth shaft).
- Pick a head style and drive type for the screw, or set the display to nut or washer only.
- Adjust tolerances: undersize for the screw diameter, clearance for the nut bore.
- Enable Split Print if you want the screw halved for horizontal layer orientation.
- Click Generate Model to render, then click Export STL to download.
Key Features
- 26 standard sizes: M2–M20 metric and #4–3/4 imperial specs in one tool.
- 8 head styles — flat, button, socket, ribbed socket, hex, pan, cheese, and headless.
- 4 drive families: hex, slot, phillips (PH1–PH4), and torx (T10–T25).
- Coarse, fine, custom pitch, or no-thread options with per-screw undersize tolerance.
- Split print mode to divide the screw horizontally for stronger 3D-printed threads.
- Hex and square nuts with 5 thickness presets (thin, normal, thick, DIN, custom) and adjustable bevel.
- Regular and large washers with optional chamfer.
- Display mode to render all parts, screw only, nut only, or washer only.
- Binary STL export with filenames that include spec and display mode.
Screw Generator FAQ
What sizes does the screw generator support?
The screw generator includes 14 metric sizes from M2 to M20 and 12 imperial sizes from #4 to 3/4 inch. Each spec automatically sets the correct thread pitch for coarse and fine options based on standard tables.
What is split print mode and when should I use it?
Split print mode cuts the screw into two halves along its length. This lets you print each half flat-side-down so that layer lines run perpendicular to the thread axis, resulting in stronger threads for functional 3D-printed fasteners.
Can I generate only a nut or washer without the screw?
Yes. The Display dropdown lets you switch between all parts, screw only, nut only, or washer only. Each mode shows and exports only the selected part, and the sidebar hides parameters that do not apply to the current selection.
How do the undersize and clearance parameters affect fit?
Screw Undersize shrinks the screw's outer diameter by the value you enter, compensating for printer over-extrusion. Nut Clearance (default 0.1 mm) enlarges the nut's internal thread bore. Together they control how tightly a printed screw and nut mate.
Try More Parametric Tools
Need boxes or gears? Continue with our dedicated tool pages, or open the homepage to use all three generators.