Tapped Holes vs Threaded Holes - Differences and ...

Threaded holes are holes with threads created using a threading process with a die tool. Though similar to tapped holes, they are manufactured differently. In engineering, threaded holes are essential components of mechanically fastened parts. They are easily added with CNC machines and typically are threaded last after other machining processes.

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Threads in a threaded hole can be cut using a cutting tool (like a cutting tap or single lip cutting tool) or formed using a forming tap.

The callout symbol for threaded holes is the 'Ø' diameter symbol unless they are metric, in which case the diameter symbol is replaced with an 'M'. Tapped and threaded holes are made through different machining processes but serve a similar function for nuts, screws, and bolts.

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The difference between threading and tapping lies in the tools and surfaces used. Threading creates threads outside a hole using a die tool, while tapping creates threads inside a drilled hole using a tapping tool.

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