At 06:17 PM 6/16/2010, Roger Whittaker wrote:
>the metric thread can be so minuscule as not to matter by the eye ... but
>matter a great deal
>just like an ear knows whose finger is in it ... so does the metric thread

Just so happens that 7/16-20 UNF is practically identical to
M11x1.25; 1% on diameter and 2% on pitch.  For a short thread
engagement this doesn't matter.  The UNF and ISO thread forms are
slightly different, but not enough to matter here.

Yours,
David