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Subject:Re: Heli-Coil tap and drill size needed as soon as poss
From:David Beierl
Date:Wed, 27 Jun 2001 02:13:35 -0400
At 01:52 AM 6/27/2001, Austin wrote:
>John - 'Q' is a legitimate drill size, 0.332 inches diameter (ie, just a
>bit bigger than a 5/16" drill, which is a decimal 0.3125 inches
>diameter).  Heli-Coils use size specific taps which are *not* standard

American drill sizes half-inch and under include 1/16-1/2 by 64ths, then
numbers 0 (a bit under 1/4) to 80 (a bit under 0.02), then letters A (close
to 1/4) to Z (close to 1/2).

The metric folks tend to fall on the floor in hysterics when they think
about this... <g>

david

David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"