Fry, Horace Pugh. [from old catalog] · Philadelphia [The John C. Winston co.] · leaf 52
HREADS Fig. 29. measured parallel to the axis. The distance between two adjacent threads is sometimes called the divided pitch. The lead is the one generally specified for the machine shop (see Fig. 29); e. g., double thread J^ lead or 2 pitch; triple thread f^ lead or IJ pitch. Triple thread 3… … Fig. 30. 50 O^DIAM OF TAP R = ROOT DIAM. D = DRILL DIAM. H= DEPTH DRILLED. T= DEPTH TAPPED.D=R, APPROXIMATELY.HIDDEN THREADS AREALWAYS INDICATED A5SHOWN AT X. H TAPPED HOLES. 1. The diameter of a tapped hole isthe outside diameter of the threaded piece that would fit that hole,not the apparent…
Mechanical drawing
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