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Drill Charts and Countersink Calculations

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The Speed and Feed and Countersink applications in Trades Math Calculator include convenient drill charts.
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These charts enable you to calculate cutting speeds and drill point calculations without having to go to reference books or charts.
Even if you don't need the calculations the charts are easy to access just for lookup purposes.
  • Tapping drill charts for inch and metric threads, including roll threads and pipe threads.
  • Decimal equivalents for fractional, letter and number inch system drills
  • Drill point and countersink depth. Easily calculate depth to drill for full diameter depth, or depth of countersink for a specified diameter
  • Convert all values between inch and millimeters
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Tapping drills for inch, metric and taper pipe threads

Decimal equivalents of fraction and letter and number drills
Pipe tap drills