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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 ------------------------------------^


Designation examples of various threads**CHART II
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