In Onshape, the "Threads" feature allows you to add and specify threads on cylindrical surfaces, creating threaded holes or shafts in your 3D models. This feature is particularly useful when designing mechanical components that require screw connections.

To use the Threads feature in Onshape, you select the cylindrical surface where you want the threads to be added. Then, you define the thread specifications, such as thread type (metric, inch, etc.), thread size, pitch, and engagement depth. Onshape supports a variety of thread types, including standard ISO and ANSI threads.

Once the thread specifications are set, Onshape automatically generates the 3D representation of the threaded feature on the selected cylindrical surface. This representation can be adjusted or modified using various parameters to achieve the desired appearance.

Using the Threads feature in Onshape simplifies the creation of threaded components, ensuring accurate thread representations for manufacturing and assembly purposes. It allows designers and engineers to visualize and design threaded connections accurately, facilitating the creation of functional and realistic 3D models.

Custom Threads

If you are trying to produce threads for 3D printing or want them to be visible in your part drawings you will have to draw custom threads. 

To draw custom threads you first will draw the profile shape that you want the thread to be. Then you will draw a helix using the helix feature that is set to the pitch you want your threads to be. Finally you will sweep the sketch you drew along the path of the helix.