CAD tip # 6537:

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How to model a 3D thread (screw) in AutoCAD?

Although 3D threads (nut/bold) are usually not modelled in detail and CAD applications like Inventor have internal functions for representing threads, sometimes you may need to really model a true 3D thread in AutoCAD.

The easiest way is to use a combination of the HELIX and SWEEP modelling commands.

First prepare a profile of a single thread (e.g. a filleted triangle), 3DROTATE it to be perpendicular to the sweep path, and then sweep this profile along a 3D spiral created by the Helix command.

In older versions of AutoCAD you can also use the 3DSPIRAL Lisp utility (see the Download section).

You can also use of the threaded blocks in our CAD blocks library.

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13.2.2009 33017×

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applies to: AutoCAD ·

See also:
Tip 13935:	How to get machining data from a thread designed in Fusion?
Tip 13040:	iLogic - display information about complexity of an Inventor part.
Tip 12962:	True 3D models of threads in Inventor 2024, 2023, 2022 and 2021.
Tip 12961:	Bolt-nut constraint/joint in Fusion 360.
Tip 12255:	How to change the number of CPUs used in Nastran for analyses?

Selected tip: How to save a Mechanical Desktop 3D model to the STL format?

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