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/Measuring Tools/Small Tool Instruments/Thread Gauges/NPTF (National Pipe Taper Fine) Thread Gauges
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NPTF (National Pipe Taper Fine) Thread Gauges
https://www.cutwel.co.uk/measuring-tools/small-tool-instruments/thread-gauges/nptf-national-pipe-taper-fine-thread-gauges
https://www.cutwel.co.uk/media/catalog/category/Tapered_Thread_Gauge_1.jpg
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