Thread and tap drill calculator (ISO metric)
Choose a coarse thread size, or enter a diameter and pitch for fine threads, to get the tap drill, thread dimensions and thread-turning infeed.
- Tap drill diameter (D − P)
- Pitch diameter d2
- External minor diameter d3
- Internal minor diameter D1
- External thread depth h3 (radial)
| Pass | Cumulative depth (mm) | Infeed this pass (mm) |
|---|
- Dimensions follow the ISO 68-1 basic profile. Infeed decreases per pass for equal chip area; the default number of passes is a general reference, so adjust it to your insert maker's recommendation.
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