American screw pitch gage has 30 blades, U.S. standard thread 60 degree with a measuring range or 6-60 threads per inch.
Metric screw pitch gage has 30 blades, pitch range 0.4mm-7mm, metric thread 60 degrees with a measuring range of M2-60M.
Whitworth (British standard) screw pitch gage has 28 blades, Whitworth thread 55 degrees with a
measuring range of 1/16-2-1/2.
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