Thread identification chart and thread angle diagrams**CHART I
How the 3 most popular threads are specified:
examples --
| U.S.A. STANDARDS: 3/8 - 24 UNF |
METRIC STANDARDS:...M 10 X 1.5 |
BRITISH STANDARDS: 1/4 BSW |
nominal diameter --------^ |
thread designation --------^ |
nominal diameter --^ |
threads per inch --------^ |
nominal diameter ------^ |
thread designation ------^ |
thread designation -----^ |
pitch ------------------------------------^ |
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Designation examples of various threads**CHART II | |||||||||||||||||||||||||||||||||||||||
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ORIGIN | COARSE THREAD | FINE THREAD | EXTRA FINE THREAD | ||||||||||||||||||||||||||||||||||||
METRIC | M 8 | M 8 X 1.0 | M 8 X 0.75 | ||||||||||||||||||||||||||||||||||||
U.S.A. | 3/8 - 16 UNC | 3/8 - 24 UNF | 3/8 - 32 UNEF | ||||||||||||||||||||||||||||||||||||
BRITISH | 1/2 BSW | 1/2 BSF | NONE | ||||||||||||||||||||||||||||||||||||
ORIGIN | MINIATURE THREAD | PIPE TAPERED THREAD | PIPE PARALLEL THREAD | ||||||||||||||||||||||||||||||||||||
METRIC | M 1.0 | M 12 X 1.5T (TAPER) | M12 X 1.5 | ||||||||||||||||||||||||||||||||||||
U.S.A. | 1.0 UNM | 1/8 - 27 NPT | 1/8 - 27 NPS | ||||||||||||||||||||||||||||||||||||
BRITISH | 10 BA | 1/2 BSPT | 1/2 BSPF |