Drill Bit Sizes Metric
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What are the closest american and metric drill bit sizes for the following?
12mm X 1.25, 20mm X 1.75, 30mm X 2.25
You only need to concern yourself with the ‘mm’ values. So, for metric, use 12 mm bit; 20 mm bit, and 30 mm bit.
Dividing each by 25.4 mm/inch will give you the decimal values in inches. You can purchase ‘numbered bits’ which are very precise (to thousandths.) [My small set of numbered bits only go as large as .226 inches.] If you do not need precision, convert the decimal to a fraction.
You can then look up the fractional equivilent of those. Here goes:
12 divided by 25.4 = 0.4724 inches – I would use: 1/2 inch bit … based on the tollerance needed.
20 divided by 25.4 = 0.7874 inches – I would use: 3/4 or 24/32 inch bit … based on the tollerance needed.
30 divided by 25.4 = 1.1811 inches – I would use: 1-3/16 inch bit … based on the tollerance needed.
Here you can find Drill Bit Sizes Metric items on Ebay:
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20 PC MICRO METRIC .3-1.6 mm SIZE DRILLS PRECISION DRILLING JEWELRY MODELS TOOLS $4.29 |
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20 PC MICRO METRIC .3-1.6 mm SIZE DRILLS PRECISION DRILLING JEWELRY MODELS TOOLS $4.29 |
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20 PC MICRO METRIC .3-1.6 mm SIZE DRILLS PRECISION DRILLING JEWELRY MODELS TOOLS $4.29 |
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NEW GENERAL TOOLS 14 STAINLESS FRACTIONAL METRIC DRILL BIT HOLE SIZE GAUGE $10.99 |
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24 PCS HSS POLISHED DRILL BIT SET (metric size) $57.41 |
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Non Marking / No Mar Drill Bit Depth Stop Collar System Metric and Engish $67.61 |
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Non Marking / No Mar Drill Bit Depth Stop Collar System Metric and Engish $75.85 |
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Klein Tool Unibit 59021 Steel Step-Drill Bit Metric Size Step 4mm-12mm $18.00 |