Screw Generator - Parametric Screws, Nuts & Washer

Looking for Screws? Look no further.

This OpenSCAD script lets you generate a wide variety of ISO/DIN and UTS (inch-based) screws, nuts, and washers - all fully parametric and customizable. Built using the power of BOSL2, it follows real-world specifications for both metric fasteners (M2–M20) and UTS sizes (#4–3/4"), including proper head types, drive recesses, and threading options. Whether you're designing for mechanical assemblies, prototypes, or engineering applications, this script has you covered.

Click on Customize to open the generator.

🚀 Quick Start

1. Select a Fastener Type
Choose between screws, nuts, or washers. Adjust general parameters like diameter, thread type, and length.
 

2. Customize Your Fastener
Each fastener type has its own unique options:

• Screws: Select length, head type (Hex, Pan, Flat, Socket, etc.) and drive type (Phillips, Torx, Slot, etc.).
• Nuts: Choose between hex and square shapes, adjust thickness, and control 3D printing clearance.
• Washers: Select standard (ISO 7089) or large (ISO 7093) sizes with optional chamfering.

Not all configuration combinations (e.g., a ‘slot’ drive on a ‘hex’ head) are supported, as they do not conform to known specifications.

3. Render and Export
Generate your fastener at the desired resolution and export it for slicing and printing. For small screws, it is important to use a (extra) fine layer height to achieve better detail and fit.

⭐ Features

• Multiple Fastener Types
  Generate ISO/DIN/UTS screws, nuts, and washers with precision.
• Customizable Parameters
  Adjust screw length, head type, drive type, thread type, nut shape, washer size, chamfer, and more.
• Precision Modeling
  Follows ISO 4017 (DIN 933) for screws, ISO 4032 (DIN 934) for nuts, and ISO 7089/7093 for washers, ensuring realistic and functional parts.
• 3D Printing Ready
  Fine-tune undersizing, clearance, and resolution settings for perfect fits in 3D-printed assemblies.

This script is open source under a CC BY-NC-SA 4.0 license - free to use, modify, and share with proper credit. Built with BOSL2, ensuring clean, efficient OpenSCAD code. If you have GitHub, don't forget to star the repository!

🛠️ Changelog

v1.1	Added support for UTS screws (inch-based #4–1/2"). Included ANSI/ASME USS & SAE washers for UTS compatibility. Added custom nut thickness option. Added new head type 'ribbed socket'.
v1.2	Added option to split screws for increased strength when printing.
v1.3	Added support for partially threaded screws. Added support for M14, M18, M20, 1/2" and 3/4". Added support for M7 (special case - only exists as socket head screws and square/DIN hex nuts).
v1.4	Added debug mode to view model information. Added parameters to control the bevel of the nut.
v1.5 (NEW)	Added support for M2.5, 5/16", 7/16" and 9/16". Added new head type 'button'. Ensure models displayed side-by-side can't overlap.

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