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As with so many things the USA and UK terminology differs.


UK = First (or taper), second and plug (as Brian and Terry said) Metric Taps and Dies


USA = taper, plug and bottom (or bottoming) (as Ed said) Regular Tap Sets On Tapco Cutting Tools Inc.


See also bushes = bushings


potato potarto tomayto tomato :funny::funny::funny::funny::funny:


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