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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

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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
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  • en: en 10226 pipe threads thight joints
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