The TUPYPRES nut (figure 1931) joins two pipes of the same diameter in the TUPYPRES system, with no thread and no welding.
| Figure number | 1931 |
| Size range | 1/2" – 2.1/2" |
| Finish | Galvanised |
| Thread | Mechanical compression joint — no thread |
| Standard | ISO 5922 / EN 1562 (material); verify figure-specific approvals |
| Maximum working pressure | Depends on fluid, pipe material and temperature; see TUPYPRES chart |
| Material | Malleable cast iron |
The size range summarises this figure's table and does not guarantee stock in every size. Check the product-family catalogue and the required figure and size approvals before selection.
TUPYPRES uses malleable iron material standards ISO 5922 / EN 1562. Verify any figure- and size-specific approval in the current manufacturer documentation.
The dimension letters follow the technical drawing above. Weights are per single fitting, in kilograms.
| Nominal diameter | Dimensions (mm) | Weight (kg) | Pieces per carton | |||||
|---|---|---|---|---|---|---|---|---|
| inch | mm | H | A | L | Bc | Galvanised | Black | |
| 1/2" | 15 | 85 | 60 | 26 | 40 | 0.379 | — | 40 |
| 3/4" | 20 | 94 | 66 | 26 | 49 | 0.572 | — | 25 |
| 1" | 25 | 92 | 65 | 26 | 54 | 0.625 | — | 25 |
| 1.1/4" | 32 | 104 | 75 | 26 | 69 | 1.002 | — | 15 |
| 1.1/2" | 40 | 99 | 70 | 29 | 74 | 1.230 | — | 12 |
| 2" | 50 | 115 | 83 | 29 | 89 | 1.697 | — | 8 |
| 2.1/2" | 65 | 150 | 118 | 31 | 106 | 2.764 | — | 5 |
Source: TUPY catalogue dimensional data for this figure; verify the current revision.
Need pricing for this fitting?
Send us the figures and sizes you need and our Dubai office will come back with a quotation, stock position and lead time.
The TUPYPRES nut does in the mechanical system what a socket does in a threaded one: it joins two pipes of equal diameter end to end. The difference is in how it is made up.
With threaded work every joint needs the pipe end cutting, sealing tape and a wrench, and the finished quality depends on the fitter's skill. In the TUPYPRES system the pipe goes into the fitting and the nut is tightened down onto the sealing ring — a mechanical joint made with an ordinary wrench, with no press machine.
The internal ring provides the seal, and the pressure of the nut on that same ring holds the pipe mechanically. In a threaded system the thread had to do both jobs at once.
It is the most used single item on any TUPYPRES project. Supplied as figure 1931, in sizes 1/2in to 2 1/2in. Confirm current figure- and size-specific approvals before specifying.
The TUPYPRES Nut is made in 7 sizes, from 1/2" to 2.1/2". The full list of sizes, with the dimensions in millimetres and the weight of each piece, is in the dimensions and weights table on this page.
The weight depends on the size: the 1" size, for example, weighs 0.625 kg. The weights of every size are taken from the official TUPY catalogue and are listed in the table on this page, so they can be used to work out shipping weight and freight cost.
An ordinary wrench. No press machine and no special tool is required. Cut the pipe square, deburr it, push it into the fitting up to the marked depth, then tighten the nut by hand and finish with a wrench to the torque and number of turns given in the TUPYPRES catalogue. If a joint is taken apart, replace the ring set before making it up again.
TUPYPRES is a mechanical compression joint. The pipe goes into the fitting and the nut is tightened — no threading, no welding, no flame and no press machine. A ring set already assembled inside the fitting (rubber sealing ring, compression ring and locking ring) makes the joint tight as the nut is drawn up. Installation is far quicker than threading and calls for less skill; the main uses are fire protection, water, gas and compressed air networks.
According to the TUPYPRES catalogue, on steel pipe: water up to 16 bar at 80 °C, liquid fuel up to 16 bar at 80 °C, compressed air up to 10 bar at 80 °C and gas up to 10 bar at 70 °C. Lower figures apply on PE80 and PE100 polyethylene pipe, and the system is not recommended for compressed air on polyethylene.
The TUPYPRES system can be installed on steel pipe to NBR 5580 and NBR 5590 (equivalent to EN 10255 and DIN 2440/2441) and on PE80 and PE100 polyethylene pipe. A transition fitting is also available for joining steel pipe to polyethylene pipe.
Where dimensions permit, genuine TUPY fittings carry cast markings such as the factory mark and nominal size. Check the figure-specific catalogue and packaging as well. The threads are clean and free of burrs, and the galvanised coating is even. The surest check is to weigh the piece and compare it with the weight table on this page; counterfeit pieces usually come out lighter than the official catalogue weight.
Use the request a quote page at /request-a-quote and tell us the figure number (1931), the sizes and the quantities you need. Our Dubai office will come back with a quotation, the current stock position and a lead time. Amini Building Materials Trading L.L.C is the exclusive agent of TUPY S.A. in the Middle East and supplies the region from Dubai.
TUPYPRES TeeFigure 1944
TUPYPRES Tee, One Threaded EndFigure 1949
TUPYPRES Reducing SocketFigure 1932
Reducing Bushings — NPT Medium PressureFigure 1002R
Plain Plugs — NPT Medium PressureFigure 1010
Elbows — NPT Medium PressureFigure 1015
Reducing Elbows — NPT Medium PressureFigure 1020R
45° Elbows — NPT Medium PressureFigure 1025
