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markings on Screw Pitch Gauge?
I've got an old screw pitch gauge that I inherited. There's no mfr's
name marked on it, just "Number 137". the individual leaves are marked with two numbers each, but these numbers are not reciprocals. The first number is always a small integer which I presume is threads-per-inch. the second number is always a decimal. All the leaves are of equal thickness, so they are not thickness calibrations as in a feeler gauge. Any idea what the second set of numbers are? |
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