M (metric, standard)
Metric standard ISO-thread DIN 13
In this category, you will find threading tools specifically for metric standard threads (coarse threads). In addition to standard solutions, we also offer various specialised solutions for thread cutting. These include double-ended VÖLKEL HexTap DS taps, extra-long machine taps, threading bits or combined taps.
With tools categorized by application, you can quickly select the right tool.
You will find miniature taps in M 1 as well as threading tools up to M 110, which are mainly used in large industrial plants and machines. We offer the right tool for many different materials and areas of application.
Standardised and versatile: The metric standard thread is one of the most common type of thread used in technology and mechanical engineering. Would you like to learn more about metric threads, such as thread angle, recommended core hole dimensions, etc.?
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Metric standard ISO-thread DIN 13
The metric standard thread (coarse thread) is standardised in DIN 13 and has a thread angle of 60°. It is one of the most commonly used thread types in Europe. Due to globalisation and international trade, the metric thread is now also used worldwide. Metric threads have the prefix M (for metric) appended to the nominal size. In our shop, the pitch (e.g. M 10x1.5 for M 10) is specified also for metric coarse threads.
The table shows the recommended core hole sizes (drill diameters) for the most common metric standard threads, which serve as pre-drill sizes for female threads. In addition, the recommended bolt sizes (outer diameters) for producing metric male threads are also specified.
Thread table for metric standard ISO-thread DIN 13
| Thread size | Pitch | Core hole diameter | Bolt diameter |
|---|---|---|---|
| M 1 | 0.25 | 0.75 mm | 0.97 mm |
| M 1.1 | 0.25 | 0.85 mm | 1.07 mm |
| M 1.2 | 0.25 | 0.95 mm | 1.17 mm |
| M 1.4 | 0.30 | 1.10 mm | 1.36 mm |
| M 1.6 | 0.35 | 1.25 mm | 1.54 mm |
| M 1.7 | 0.35 | 1.30 mm | 1.64 mm |
| M 1.8 | 0.35 | 1.45 mm | 1.74 mm |
| M 2 | 0.40 | 1.60 mm | 1.93 mm |
| M 2.2 | 0.45 | 1.75 mm | 2.13 mm |
| M 2.3 | 0.40 | 1.90 mm | 2.23 mm |
| M 2.5 | 0.45 | 2.05 mm | 2.43 mm |
| M 2.6 | 0.45 | 2.10 mm | 2.53 mm |
| M 3 | 0.50 | 2.50 mm | 2.92 mm |
| M 3.5 | 0.60 | 2.90 mm | 3.41 mm |
| M 4 | 0.70 | 3.30 mm | 3.91 mm |
| M 4.5 | 0.75 | 3.70 mm | 4.41 mm |
| M 5 | 0.80 | 4.20 mm | 4.90 mm |
| M 6 | 1.00 | 5.00 mm | 5.88 mm |
| M 7 | 1.00 | 6.00 mm | 6.88 mm |
| M 8 | 1.25 | 6.80 mm | 7.87 mm |
| M 9 | 1.25 | 7.80 mm | 8.87 mm |
| M 10 | 1.50 | 8.50 mm | 9.85 mm |
| M 11 | 1.50 | 9.50 mm | 10.85 mm |
| M 12 | 1.75 | 10.20 mm | 11.83 mm |
| M 14 | 2.00 | 12.00 mm | 13.82 mm |
| M 16 | 2.00 | 14.00 mm | 15.82 mm |
| M 18 | 2.50 | 15.50 mm | 17.79 mm |
| M 20 | 2.50 | 17.50 mm | 19.79 mm |
| M 22 | 2.50 | 19.50 mm | 21.79 mm |
| M 24 | 3.00 | 21.00 mm | 23.77 mm |
| M 27 | 3.00 | 24.00 mm | 26.77 mm |
| M 30 | 3.50 | 26.50 mm | 29.73 mm |
| M 33 | 3.50 | 29.50 mm | 32.73 mm |
| M 36 | 4.00 | 32.00 mm | 35.70 mm |
| M 39 | 4.00 | 35.00 mm | 38.70 mm |
| M 42 | 4.50 | 37.50 mm | 41.69 mm |
| M 45 | 4.50 | 40.50 mm | 44.69 mm |
| M 48 | 5.00 | 43.00 mm | 47.66 mm |
| M 52 | 5.00 | 47.00 mm | 51.66 mm |
All specifications refer to metric internal and external threads with a ‘medium’ tolerance range.
HINT: Using a simple formula (rule of thumb) you can calculate the size of the core hole (bore) for a metric thread. Thread size (nominal size) minus pitch = core hole drill size (bore diameter). Calculation example for M 10x1.5 standard thread: 10 - 1.5 = 8.5 mm