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Reading the spec sheet
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The chart calls for 3.3 mm. The values below are direct conversions of the stored Metric tap-drill row.
Compare M4 × 0.7 with every other Metric entry in the same source table. The current answer is highlighted.
| Thread | Tap drill | Decimal inches | Millimeters |
|---|---|---|---|
| M3 × 0.5 Metric | 2.5 mm | 0.0984″ | 2.5 mm |
| M4 × 0.7 MetricCurrent | 3.3 mm | 0.1299″ | 3.3 mm |
| M5 × 0.8 Metric | 4.2 mm | 0.1654″ | 4.2 mm |
| M6 × 1.0 Metric | 5.0 mm | 0.1969″ | 5 mm |
| M8 × 1.25 Metric | 6.8 mm | 0.2677″ | 6.8 mm |
| M10 × 1.5 Metric | 8.5 mm | 0.3346″ | 8.5 mm |
| M12 × 1.75 Metric | 10.2 mm | 0.4016″ | 10.2 mm |
| M16 × 2.0 Metric | 14.0 mm | 0.5512″ | 14 mm |
| M20 × 2.5 Metric | 17.5 mm | 0.689″ | 17.5 mm |
The existing tap-drill lookup is preset to M4 × 0.7 Metric. Search any thread in the source chart without leaving this page.
Use 3.3 mm. Its decimal diameter is 0.1299 inch, or 3.3 mm.
3.3 mm converts to 3.3 mm. The listed chart designation remains the recommended drill selection for this thread.
Yes. This chart row is in the Metric family, and the comparison table on this page contains only other Metric entries from the same shop chart.
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