Technical information / Threads and fittings / Nipple
Thread standard
ISO 4144 TYPE · NIPPLE
Stainless steel nipple dimensions
The CSV uses semicolons as separators. The link carries the selected size.
| Size | DN | Sacross flats | Llength | kg |
|---|---|---|---|---|
| R 1/8 | DN6 | 12 | 24 | 0.01 |
| R 1/4 | DN8 | 16 | 28 | 0.02 |
| R 3/8 | DN10 | 19 | 28 | 0.04 |
| R 1/2 | DN15 | 22 | 34 | 0.04 |
| R 3/4 | DN20 | 30 | 40 | 0.06 |
| R 1 | DN25 | 36 | 46 | 0.14 |
| R 1 1/4 | DN32 | 46 | 53 | 0.17 |
| R 1 1/2 | DN40 | 50 | 54 | 0.18 |
| R 2 | DN50 | 65 | 62 | 0.3 |
| R 2 1/2 | DN65 | 80 | 70 | 0.62 |
| R 3 | DN80 | 90 | 78 | 0.94 |
| R 4 | DN100 | 120 | 94 | 1.07 |
Notes
- Dimensions are taken from our supplier's stainless steel nipple tables; length and across-flats may differ slightly between manufacturers.
- Nipple threads are ISO 7-1 R (taper external thread); they form a tight joint with valves and fittings that have Rp or Rc internal threads.
- A hex nipple joins two internally threaded parts and is tightened at the hexagon (S). Double / single-ended nipples are pipe pieces (threaded at one or both ends, the other end plain for welding).
- Accuracy and currency are not guaranteed; use the current edition of the standard for design and purchasing decisions. How the library is compiled →
Dimension letters
| L | Overall length | S | Across flats (hexagon) |
| D | Pipe outside diameter | R | Taper external thread (ISO 7-1) |
Joint type and P&ID symbol
A nipple is a short piece of pipe with male threads at both ends; it joins two female-ended parts (e.g. a valve and a fitting).
female partmale part, pipegasket / sealing tapethread
- Apply tape or compound to the nipple threads.
- Screw the nipple into one part, then into the mating part.
- On a hex nipple, apply the spanner to the hexagon.
Used to connect valves, strainers, gauges and fittings without a length of pipe in between. A long nipple replaces a short pipe.
P&ID: Threaded jointTwo short thin lines perpendicular to the pipeline. Symbol library →
Not to scale; proportions are indicative.
