Quick Couplings
Nitto Kohki
This overview brings together the entire Nitto Kohki quick-coupling range with over 25 special and dedicated series beyond the standard pressure classes. From the flat-face FF and F35 Cupla through vibration-isolating, rotary and purgeable versions to plastic, paint and miniature couplings, there is a matching connector here for almost every special requirement.
Whether a non-spill flat-face coupling for clean disconnection, a Rotary Cupla against hose twisting, purge variants with integrated flushing, or corrosion-free Plastic Cupla - all series use the proven Nitto Kohki sleeve mechanism with automatic shut-off and are interchangeable with each other and with standard couplings to ISO 6150.
Nitto Kohki Quick Couplings - special & dedicated series
Anti Vibration Plug HoseVibration-isolating plug hose
Compact Zero Spill CuplaCompact, non-spill
Cupla Hose with Full Blow CuplaPre-assembled hose line with coupling
F35 CuplaFlat-face, low-spill
FF CuplaFlat-face, clean-break
Flow Meter & MonitorFlow metering & monitoring
HI Cupla 2 way typeHI with double shut-off
HI Cupla BLHI with locking
High Flow CuplaIncreased flow rate
HosesCupla hoses & accessories
HSP DC CuplaHigh-pressure, double shut-off
In-Line Purge AdapterInline purge adapter
Lock Cupla 200Lockable, up to 2.0 MPa
Mini Cupla SuperMiniature, high flow
Mini CuplaMiniature coupling for small devices
Nut CuplaScrew coupling, panel mount
Paint CuplaSolvent-resistant, paint lines
Plastic Cupla BC TypePlastic, light, corrosion-free
Purge HI CuplaHI with purge function
Purge Line CuplaInline with purge
Rotary Full Blow Line CuplaRotary, full bore
Rotary Line CuplaRotary inline coupling
Rotary PlugRotary plug, anti-twist
Twist PlugTwist plug, easy release
25+ dedicated series - a matching Cupla for almost any special requirement
Flat-face / non-spill - FF and F35 Cupla for clean, low-spill disconnection
Rotary versions - rotating couplings against hose twisting
Purge function - integrated flushing for cleaning and media changes
Material variety - brass, steel, stainless and plastic to suit the application
ISO 6150 compatible - interchangeable with each other and standard couplings
| Criterion | Nitto Kohki | Parker | Stäubli | Rectus |
|---|---|---|---|---|
| Range breadth | 25+ special series | broad | broad | broad |
| Flat-face coupling | Yes (FF/F35) | Yes | Yes | Yes |
| Rotary / swivel | Yes | Partial | Partial | Partial |
| Purge / flush variants | Yes | Rare | Rare | Rare |
| Plastic couplings | Yes (Plastic Cupla) | Limited | No | Limited |
| ISO 6150 | Yes | Yes | Yes | Yes |
| Group | Examples | Property | Application |
|---|---|---|---|
| Flat-face Cupla | FF, F35 | non-spill, clean | sensitive media, hygiene |
| Rotary Cupla | Rotary Line, Rotary Plug | swivel | moving hoses, tools |
| Purge Cupla | Purge HI, Purge Line | integrated flushing | media change, cleaning |
| Plastic Cupla | BC Type | light, corrosion-free | chemicals, water, lab |
| Mini Cupla | Mini, Mini Super | miniature body | small devices, instrumentation |
| Paint Cupla | Paint | solvent-resistant | paint & coating lines |
Typical applications: special applications in mechanical engineering and manufacturing, paint and coating lines, hygiene and cleaning processes, moving hose connections and robots, laboratory and measurement technology, and anywhere standard couplings reach their limits on requirements such as swivelling, purging or corrosion resistance.
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 |
|---|---|---|---|---|---|---|
| FLATFACE CUPLA F35 | 350 bar | Thread 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch | Two-way shut-off (Spill Reduction) | Hydraulic oil | Special steel (Nickel plated) | 107 |
| FLATFACE CUPLA FF | 350 bar | 3/8 inch, 1/2 inch, 3/4 inch, 1 inch (thread) | Two-way shut-off (Spill Reduction) | Hydraulic oil | Special steel (Nickel plated) | 109 |
| In-Line PURGE ADAPTER | 350 bar | PAD-2: R 1/4. PAD-3FM: R 3/8 x Rc 3/8. PAD-4FM: R 1/2 x Rc 1/2. PAD-6FM: R 3/4 x Rc 3/4. PAD-8FM: R 1 x Rc 1. | - | Hydraulic oil | Steel (Nickel plated) | 168 |
| HSP-DC CUPLA | 206 bar | 1/4 inch to 1 inch (applicable pipe size 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch) | Two-way shut-off | Hydraulic oil | Special steel (Nickel plated) | 158 |
| ANTI-VIBRATION PLUG HOSE | 15 bar | R 1/4 (SHA-3-2R), R 3/8 (SHA-3-3R) | One-way shut-off | Air | - | 66 |
| HI CUPLA BL | 15 bar | 1/4 inch, 3/8 inch, 1/2 inch (thread and hose barb); SN type for urethane hose: for 6.5 x 10 mm, 8 x 12 mm and 8.5 x 12.5 mm hose | One-way shut-off | Air, Water | Steel (chrome plated), Stainless steel (SUS304) | 41 |
| HI CUPLA Two Way Type | 15 bar | Thread 1/4 inch, 3/8 inch, 1/2 inch. Hose barb for dia. 6.5 mm x dia. 10 mm and dia. 8.5 mm x dia. 12.5 mm hose. | One-way shut-off | Air | Steel (Chrome plated), Brass (made-to-order item), Stainless steel (made-to-order item) | 48 |
| LOCK CUPLA 200 | 15 bar | Thread and hose barb 1/4 inch, 3/8 inch, 1/2 inch; SNRG type for ø6.5 mm x ø10 mm and ø8.5 mm x ø12.5 mm hose | One-way shut-off | Air | Steel (Chrome plated) | 47 |
| NUT CUPLA / NUT CUPLA 200 / ROTARY NUT CUPLA / HI CUPLA for Connection to Braided Hoses | 15 bar | Urethane hose ø5 mm x ø8 mm to ø11 mm x ø16 mm; braided hose ø9 mm x ø15 mm | One-way shut-off | Air, Water | Steel (chrome plated), Stainless steel (SUS304), Brass (HI CUPLA for Connection to Braided Hoses) | 45 |
| PURGE HI CUPLA | 15 bar | PVR Type: thread 1/2 inch, 3/4 inch, 1 inch; hose barb 1/2 inch, 3/4 inch, 1 inch hose. PV Type: thread 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch | One-way shut-off | Air | Zinc alloy (part Brass and others) - PVR Type, Brass (Chrome plated) - PV Type | 51 |
| ROTARY FULL BLOW LINE CUPLA | 15 bar | RT type (For two outlets): inlet Plug (20PFF), outlet FULL BLOW CUPLA. RE type (For three outlets): inlet R 1/2, outlet FULL BLOW CUPLA. | One-way shut-off | Air | Zinc alloy | 59 |
| ROTARY LINE CUPLA | 15 bar | RT Type (for two branch lines): inlet HI CUPLA Plug 20PF, outlet 2 sockets for HI CUPLA Socket Model 20. RE Type (for three branch lines): inlet R 1/2, outlet 3 sockets for HI CUPLA Socket Model 20. | One-way shut-off | Air | Body : Brass (Chrome plated), CUPLA : Steel (Chrome plated) | 55 |
| ROTARY PLUG | 15 bar | 1/4 inch, 3/8 inch | One-way shut-off | Air | Steel (Nickel plated) | 63 |
| COMPACT ZEROSPILL CUPLA | 10 bar | Thread 1/8 inch, 1/4 inch | Two-way shut-off (Spill Reduction) | Air, Water | Stainless Steel (SUS304), Nickel plated on Socket body | 29 |
| CUPLA HOSE with FULL BLOW CUPLA | 10 bar | Hose size ø5 mm×ø8 mm, ø6.5 mm×ø10 mm, ø8.5 mm×ø12.5 mm | One-way shut-off | Air | Engineering plastics (PBT, POM) - socket body with HI CUPLA ACE, Aluminum alloy - socket body with FULL BLOW CUPLA, Steel (Chrome plated) - plug body | 68 |
| FLOW MONITOR | 10 bar | Rc 3/8 and Rc 1/2 | - | Water | Brass | 166 |
| HI FLOW CUPLA / HI FLOW CUPLA BI Type | 10 bar | 1/4 inch, 3/8 inch, 1/2 inch | Two-way shut-off | Water, Temperature control refrigerant | Stainless steel, Brass | 159 |
| NK CUPLA HOSE Series | 10 bar | DUSTER CUPLA: for 1/4 inch, 3/8 inch, 1/2 inch hose and for ø6.5 x ø10 mm, ø8.5 x ø12.5 mm polyurethane hose. NK CUPLA HOSE: ø6.5 x ø10, ø8.5 x ø12.5. NK CUPLA COIL HOSE: ø5 x ø8, ø6.5 x ø10 | One-way shut-off | Air | DUSTER CUPLA - Body : Aluminum alloy, CUPLA : Steel (Chrome plated), NK CUPLA HOSE / NK CUPLA COIL HOSE socket with HI CUPLA ACE : Engineering plastics (PBT, POM), NK CUPLA HOSE / NK CUPLA COIL HOSE socket with FULL BLOW CUPLA : Aluminum alloy, NK CUPLA HOSE / NK CUPLA COIL HOSE plug : Steel (Chrome plated) | 67 |
| PAINT CUPLA | 10 bar | 3/8 inch, 3/8NPS | One-way shut-off | Solvent based paint | Socket : Aluminum alloy, Plug : Stainless steel | 153 |
| PURGE LINE CUPLA | 10 bar | Inlet R 1/2, outlet socket (PV-30SM) | One-way shut-off | Air | Brass (Chrome plated) | 54 |
| TWIST PLUG | 10 bar | Thread 1/8 inch, 1/4 inch, 3/8 inch | One-way shut-off | Air | Steel (Nickel plated) | 64 |
| MINI CUPLA / LINE CUPLA MINI | 7 bar | Thread 1/8 inch, 1/4 inch, 3/8 inch / M16, W12.5-20; Hose barb 1/4 inch, 5/16 inch, 3/8 inch | One-way shut-off | Oxygen, Fuel Gas | Brass | 69 |
| MINI CUPLA SUPER | 7 bar | Thread 1/4 inch, 3/8 inch, M16; Hose barb 1/4 inch, 5/16 inch, 3/8 inch / 5 mm ID | One-way shut-off | Oxygen, Fuel Gas | Socket : Brass (Chrome plated), Plug : Steel (Chrome plated) | 71 |
| PLASTIC CUPLA BC Type Valveless | 0.7 bar | 1/4 inch, 3/8 inch hose | Straight through | Air | Plastic | 161 |
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.
