MODRATEC Useful Data (otherwise known as MUD) is a series of pages containing helpful information particularly relevant to rail modellers. The tables on this page use our easy-to-compare format to show drill diameters of standard size imperial, number, letter, and metric drill bits.

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Comparative Standard Drill Sizes

The tables below show the comparative size of standard drill bits.

  • Imperial 1/64" to 1/2"
  • Number 1 to 80
  • Letter A to Z
  • Metric 0.20mm to 12.70mm

Revised and extended 09-Nov-2003.

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Drill Sizes 1 Drill Sizes 2 Drill Sizes 3 Drill Sizes 4 Drill Sizes 5 Drill Sizes 6 Drill sizes 7 Drill sizes 8 Drill sizes 9 Drill sizes 10


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