How to Dimension Threads in a SOLIDWORKS Drawing

Thread dimensions in SOLIDWORKS drawings are usually shown with hole callouts, cosmetic thread callouts, or notes. The right method depends on whether the thread was created with the Hole Wizard, a cosmetic thread, or modeled thread geometry.

Use Hole Callout for Hole Wizard threads

If the threaded hole was created with Hole Wizard, use Annotations > Hole Callout in the drawing. Select the threaded hole, place the callout, and review the generated thread size, depth, and quantity.

Hole Wizard callouts are usually the cleanest method because they pull information from the feature rather than relying on typed notes.

After placing the callout, read it like a machinist would. Confirm that the thread size, depth, drill information, and quantity describe the actual holes shown in the view.

Show cosmetic threads

If the part uses cosmetic threads, make sure cosmetic threads are visible in the drawing view. The thread representation should appear clearly enough for the callout or note to make sense.

Cosmetic threads keep drawings lighter than fully modeled threads. They are usually preferred unless the thread geometry is needed for rendering, 3D printing, or a special manufacturing process.

Add thread notes when needed

For custom threads, external threads, or modeled threads, you may need a manual note. Include the thread size, pitch, class, depth or length, and any standard that applies. Keep the note close to the view where the thread is shown.

For external threads, make sure the note clearly points to the threaded shaft or boss. If several threaded features appear in the same view, use clear leaders or separate notes so the reader does not apply the wrong callout.

Check drawing standards

Thread callout format can vary by company and standard. Before releasing the drawing, confirm whether your shop expects metric or inch notation, thread class, depth, drill information, and quantity formatting.

Common examples include metric callouts such as M8 x 1.25 and inch callouts such as 1/4-20 UNC. Use the notation your drawing standard requires and avoid mixing formats without a reason.

Troubleshooting

If a hole callout does not show the expected thread, check the original part feature. The drawing can only report the information that exists in the model. If the thread was modeled manually, use a clear note instead of forcing the wrong callout type.

If cosmetic threads are missing from the drawing, check the drawing view display settings and document options. The model may contain the cosmetic thread while the drawing view is simply not showing it.