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Conflicting info about ACME threads

Conflicting info about ACME threads

Conflicting info about ACME threads

I'm looking Table 2b (Gen Purpose American Natl Standard Single Start Screw Threads) and Table 3 (Gen Purpose Acme Single Start Screw Thread Data ASME/ANSI B1.5-1988) on pages 1797 and 1799 of the Machinery's Handbook 26.

Table 2b states that the maximum Minor diameter for a 3/4-6 thread is .5633 inches.
Table 3 states that the basic Minor diameter for a 3/4-6 thread is .583 inches.

So which is it?

RE: Conflicting info about ACME threads

Answered my own question. It required me to actually read smarty. The Basic Diameter is the minor diameter of the internal thread. This is not stated on or under the chart. It was is the reading a few pages before (pg 1792)

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