EN 10226 - Pipe Threads where pressure tight joints are made on the threads - Dimensions
Pipe threads where pressure tight joints are made on the threads - Part 1: Taper external threads and parallel internal threads.
EN 10226 threads with 55° angle between the flanks and a connectable root favours sealing.
Note that EN 10226 has replaced BS 21 and ISO 7.
| Pipe Size (inches) | Threads per Inch TPI - Pitch | Pitch (mm) | Major Diameter (mm) | Minor Diameter (mm) |
|---|---|---|---|---|
| 1/16 | 28 | 0.907 | 7.723 | 6.561 |
| 1/8 | 28 | 0.907 | 9.728 | 8.566 |
| 1/4 | 19 | 1.337 | 13.157 | 11.445 |
| 3/8 | 19 | 1.337 | 16.662 | 14.950 |
| 1/2 | 14 | 1.814 | 20.955 | 18.631 |
| 3/4 | 14 | 1.814 | 26.441 | 24.117 |
| 1 | 11 | 2.309 | 33.249 | 30.291 |
| 1 1/4 | 11 | 2.309 | 41.910 | 38.952 |
| 1 1/2 | 11 | 2.309 | 47.803 | 44.845 |
| 2 | 11 | 2.309 | 59.614 | 56.656 |
| 2 1/2 | 11 | 2.309 | 75.189 | 72.226 |
| 3 | 11 | 2.309 | 87.844 | 84.926 |
| 4 | 11 | 2.309 | 113.030 | 110.072 |
| 5 | 11 | 2.309 | 138.430 | 135.472 |
| 6 | 11 | 2.309 | 163.830 | 160.872 |
- 1 inch = 25.4 mm
In order to seal the conical external thread connects with the cylindrical mother screw. The connection don't guarantees sealing - so a sealant should be used.
Symbols used for type of pipe thread
- R - external taper pipe thread
- Rp - parallel internal pipe thread
Example - Designation of Threads
- External taper thread: Pipe thread EN10226 R 3/4
- Internal parallel thread: Pipe thread EN10226 Rp 3/4
