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[Imogen Fairfax]

For a machined part that has both standard and non-standard thread types, what’s the best way to call out threads in the technical drawing? In particular, should I use thread callouts or full detail views? and how do you balance thread specification clarity vs over-detailing when many features exist?

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[Rowan Pembroke]

Generally, for standard threads, a simple thread notation in the notes or directly on the view is sufficient. For instance, “M6 × 1.0 – 6H” for metric or “¼-20 UNC – 2B” for imperial. Since standard threads are universally understood, you typically won’t need a full section unless it’s critical for fit or assembly.

For non-standard or custom threads, I recommend a detailed full view or a section that shows the major/minor diameters, the pitch, and the thread form. This ensures that the machine operator or supplier clearly understands what is required. Sometimes, you can do this by referring to company standards or an internal ISO/ASME specification.

 

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