Summary

OpenSCAD library for American standard bolts and nuts with exact thread profiles.
It can generate threads alone or in a bolt/screw or nut.

The library allows to generate STL for threads from UNC #1 to UNC 4" and from UNF #0 to UNF 1 1/2". They can be generated alone or as part of another design.

The STL for UNC 1/4", UNC 3/8", UNF 1/4" and UNF 3/8" bolts and nuts are provided in thing files to show the results.

List of predefined threads

• This list can be extended with the API
• Available in standard coarse (UNC) and fine (UNF) threads
  UNC #1, UNC #2, UNC #3, UNC #4, UNC #5, UNC #6, UNC #8, UNC #10, UNC #12,
  UNC 1/4, UNC 5/16, UNC 3/8, UNC 7/16,
  UNC 1/2, UNC 9/16, UNC 5/8, UNC 3/4, UNC 7/8,
  UNC 1, UNC 1 1/18, UNC 1 1/4, UNC 1 3/8, UNC 1 1/2, UNC 1 3/4,
  UNC 2, UNC 2 1/4, UNC 2 1/2, UNC 2 3/4,
  UNC 3, UNC 3 1/4, UNC 3 1/2, UNC 3 3/4,
  UNC 4

Howto

Sample OpenSCAD file to render a 1/4" bolt in UNC standard:

    use <agentscad/unc-screw.scad>    use <agentscad/unc-thread.scad>    $fn=100;    uncBoltHexagonalThreaded( UNC1_4() );

Sample OpenSCAD file to render a 1/4" bolt in UNF standard:

    use <agentscad/unf-screw.scad>    use <agentscad/unf-thread.scad>    $fn=100;    unfBoltHexagonalThreaded( UNF1_4() );

Documentation

Detailed documentation available on GitHub Wiki

See also

• Metric libs
• BSW / BSF libs