Machinists. Why do drill charts skip 13mm and 15mm

DRP-AZ

September 26, 2011 10:00

Someone asked me and I didn't know.

So now I'm asking here.

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  babun

  September 26, 2011 13:29

  This one doesn't ....
  
  http://www.engineersedge.com/drill_sizes.htm

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  dcs shooters

  September 26, 2011 16:16

  This one doesn't either
  
  www.kramerusa.com/DrillTapChart.htm

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