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UNC Thread ANSI/ASME B1.1
https://www.gewinde-normen.de/en/unified-coarse-thread.html

UNC Thread ANSI/ASME B1.1

Specifications of International Thread Standards

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• ISO Coarse Thread (metric)
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  DIN LON 282
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  DIN LON 286
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  DIN LON 287
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• ME Model Engineer Thread (GB)
• BA British Association (GB)
• BSB British Standard Brass (GB)
• BSF Whitworth Fine Thread (GB)
• BSW Whitworth Coarse Thread (GB)
• BSPP Whitworth Pipe Thread (GB)
• BSPT Tapered Whitworth Pipe Thread (GB)
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UNC - Unified Coarse Thread. The old definition NC is comparable with the metric thread. The new term UNC is comparable with the ISO metric thread. NC and UNC threads are interchangeable, in an analogous manner like the metric and the ISO metric thread.
The flank angle is 60°.