Mold Making
Nitto Kohki
The Nitto Kohki mold-making Cupla are designed specifically for the cooling and tempering circuits of injection and die-casting moulds. The compact Mold and Hot Water series connect water and tempering-medium lines at the mould quickly, tightly and almost spill-free - at temperatures up to about 120 °C and pressures up to around 1.5 MPa.
The space-saving, double-shut-off design minimises media spillage during mould changes and keeps the machine and workplace clean. Brass and stainless-steel bodies with temperature-resistant seals ensure long service life in continuous mould-tempering operation.
Nitto Kohki Mold Making - Mold & Hot Water Cupla
| Criterion | Nitto Kohki | Parker | Stäubli | Rectus |
|---|---|---|---|---|
| Dedicated mold series | Yes (Mold/Hot Water) | Limited | Yes (RMI) | Limited |
| Max. media temperature | up to ~120 °C | approx. 100 °C | up to ~150 °C | approx. 100 °C |
| Spill-free disconnection | Yes, near spill-free | Partial | Yes | Partial |
| Compact design | Yes | Yes | Yes | Yes |
| Double-side shut-off | Yes | Limited | Yes | Limited |
| Body materials | Brass/stainless | Brass | Stainless | Brass/steel |
| Series | Application | Pressure / temperature | Key feature |
|---|---|---|---|
| Mold Cupla | mould cooling circuits | up to ~1.5 MPa, to ~100 °C | compact, low-spill, many circuits |
| Hot Water Cupla | hot-water tempering | up to ~1.5 MPa, to ~120 °C | high-temperature resistant |
Typical applications: injection and die-casting moulds, mould tempering with water and thermal oil, cooling circuits on moulds and heating platens, and fast mould changes in plastics and light-metal tool making.
Series in this category compared
Maximum working pressure is the first selection criterion. It decides the series, not the size: a low pressure coupling does not become high pressure capable by choosing a larger bore.
| Series | Max working pressure | Sizes | Shut-off type | Fluids | Body material | Catalogue page |
|---|---|---|---|---|---|---|
| HOT WATER CUPLA HW Type | 20 bar | Plug : R 1/4, R 3/8, R 1/2 / Socket : Rc 1/4, Rc 3/8, Rc 1/2 | Two-way shut-off | Water, Steam | Brass (Nickel plated) | 87 |
| MOLD CUPLA Series | 10 bar | Thread 1/8 inch, 1/4 inch, 3/8 inch; Hose barb for 1/4 inch and 3/8 inch hose / Braided hose o9 mm x o15 mm | One-way shut-off, Straight through | Water, Heated oil | Brass | 73 |
The four shut-off types
The shut-off type decides what happens on disconnection. It is the second criterion and depends on whether the line is under pressure when it is parted and how much fluid may escape.
Choosing a coupling in five steps
- Fix the fluid and the operating temperature, which gives the seal material.
- Determine the maximum working pressure, which gives the pressure class and the series.
- Choose the shut-off type: one-way, two-way, valveless or flat face.
- Fix the end connection and size: hose barb, male thread, female thread or tube fitter.
- Choose the body material for the fluid and the environment, then order plug and socket as a pair.
This page is based on the Nitto Kohki general catalogue Quick Connect Couplings C01en-b, 190 pages. The complete catalogue is available for download on this page.
