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American National hosecoupling and firehose coupling
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Acme threads American National coarse American National form American National taper angle of thread axis basic major diameter chasers class of fit clearance CM CM CM coco commission crest cutting diam eter external thread form of thread free fit FRO FRO FRO gaging notch given in Table H H H half angle helix angle Inch Inch Inch lathe tool lead errors lead screw length of engagement limiting dimensions manufacturers maximum minor Maximum pitch diameter measured milling cutter minimum minor diameter minus mum Maxi mum Mini NATIONAL PIPE THREADS National taper pipe nipple Nominal number of threads one-half ooo ooo pitch diameter tolerances screw threads Section shank sizes small end SS SS SS tap drills taper pipe thread tapped hole thread form thread gages thread plug gage thread ring gage thread series threading tools threads per inch tolerances specified U. S. Navy variation width across flats wires