Couplings by pressure rating
High pressure up to 700 bar
The Nitto Kohki high-pressure Cupla series are rated for operating pressures up to 700 bar (70 MPa) and intended for hydraulic oil, water and test media in high-pressure technology. The pressure-class-named series 210, 280, 350, 450B and 700R make selection unambiguous - the number equals the maximum working pressure in bar. They are complemented by the HSP and HSU series with screw-to-connect locking for maximum safety.
Hardened steel bodies and stainless versions (S210, SUS 316) withstand pressure peaks and continuous load in accordance with the Pressure Equipment Directive 2014/68/EU (PED). Pressure-relieved valves allow disconnection even under trapped residual pressure - essential for safe work on presses, clamping systems and test rigs.
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Buying guide
How to choose High pressure up to 700 bar
What matters when choosing: properties, comparison and typical applications.
Technical advantages - high-pressure Cupla at a glance
High-pressure couplings - Nitto Kohki vs. Parker vs. Stäubli vs. Rectus
| Criterion | Nitto Kohki | Parker | Stäubli | Rectus |
|---|---|---|---|---|
| Max. working pressure | up to 700 bar (70 MPa) | approx. 400 bar | approx. 250-500 bar | approx. 350 bar |
| Pressure-class grading | 210/280/350/450B/700R | limited | RPL/RPG series | limited |
| Screw-to-connect locking | Yes (HSP/HSU) | Partial | Yes | Rare |
| Pressure-relieved disconnect | Yes | Yes | Yes | Partial |
| Body material | hard. steel/SUS 316 | steel | stainless | steel |
| PED 2014/68/EU | Yes | Yes | Yes | Yes |
Product overview & typical applications
| Series | Application | Pressure class | Key feature |
|---|---|---|---|
| HSP Cupla | high-pressure hydraulics | up to ~30 MPa | standard high-pressure series, steel |
| 210 Cupla | hydraulics, clamping | up to 210 bar | pressure-relieved |
| 280 Cupla | presses, tool making | up to 280 bar | hardened steel |
| 350 Cupla | high-pressure hydraulics | up to 350 bar | fatigue-resistant |
| 450B Cupla | test rigs, power units | up to 450 bar | high-pressure locking |
| 700R Cupla | water-jet, pressure testing | up to 700 bar | highest pressure class |
Typical applications: high-pressure hydraulics and clamping systems, press and tool making, hydraulic pressure testing and test rigs, water-jet cutting and high-pressure cleaning, mobile hydraulics, and power units to PED 2014/68/EU.