Cupla Hose w. Full Blow Cupla

Quick couplings

The Nitto Kohki Cupla Hose with Full Blow Cupla is a pre-assembled quick-coupling hose system that delivers coupling and hose as a single unit. The range covers three variants: NKU-605PW with a 5-m hose, NKU-610PW with a 10-m hose, and NKU-810PW with a 10-m hose in a larger nominal bore. The Full Blow function provides full compressed-air flow even with the plug only partially engaged, allowing workpieces to be blown off without fully coupling the fitting.

⚡ Full Blow function - Full flow with plug only partially engaged, for blowing-off and cleaning applications

⚙ Hose lengths 5 and 10 m - NKU-605PW (5 m) and NKU-610PW / NKU-810PW (10 m) as pre-assembled units

↕ Two nominal bores - NKU-6xx (smaller bore) and NKU-8xx (larger bore) for different flow rates

✓ Ready to use - Coupling and hose factory-assembled, immediately operational without installation work

Type	Hose length	Nominal bore	Function
NKU-605PW	5 m	6 (small)	Full Blow plug with hose
NKU-610PW	10 m	6 (small)	Full Blow plug with hose
NKU-810PW	10 m	8 (large)	Full Blow plug with hose

Typical applications: Blowing and cleaning of workpieces, machines, and cavities in metalworking, flexible compressed-air supply at assembly stations and machine islands, maintenance and servicing with readily available compressed air, and cleaning stations in production where a long hose with on-demand Full Blow function is required.

Technical data from the manufacturer catalogue

Series	CUPLA HOSE with FULL BLOW CUPLA
Body material	Engineering plastics (PBT, POM) - socket body with HI CUPLA ACE, Aluminum alloy - socket body with FULL BLOW CUPLA, Steel (Chrome plated) - plug body
Seal material	Nitrile rubber (NBR)
Max working pressure	NK CUPLA HOSE with HI CUPLA ACE 1.0 MPa {10 kgf/cm2, 10 bar, 145 PSI}, NK CUPLA COIL HOSE with HI CUPLA ACE 0.7 MPa {7 kgf/cm2, 7 bar, 102 PSI}, NK CUPLA HOSE with FULL BLOW CUPLA 1.0 MPa {10 kgf/cm2, 10 bar, 145 PSI}, NK CUPLA COIL HOSE with FULL BLOW CUPLA 0.7 MPa {7 kgf/cm2, 7 bar, 102 PSI}
Working temperature	Nitrile rubber (NBR): -5 °C to +60 °C
Valve structure	One-way shut-off
Applicable fluids	Air
Vacuum service	Not suitable for vacuum application in either connected or disconnected condition.
Size range	Hose size ø5 mm×ø8 mm, ø6.5 mm×ø10 mm, ø8.5 mm×ø12.5 mm
Catalogue page	C01en-b, 68

Operating principle

On disconnection the valve in the socket closes the supply line. The fluid left in the plug escapes.

Connecting sequence of a ball locking quick connect coupling.

Sockets of HI CUPLA ACE and FULL BLOW CUPLA comes with a spring nut that prevents hose bending and urethane hose with excellent flexibility, durability and wear resistance.
Built-in separation prevention mechanism locks the sleeve upon connection, thus prevents accidental disconnection.
Just push the plug into the socket for simple connection.
Spiral polyurethane coil hoses processed from straight tube have self-recoiling feature.
A Sleeve Cover is attached to NK CUPLA HOSE / NK CUPLA COIL HOSE with FULL BLOW CUPLA, which reduces the impact on CUPLA and improves operability.
HI CUPLA ACE and FULL BLOW CUPLA sockets with polyurethane hoses are now standard stock items.
The flow rate is increased by up to 40% more than that of HI CUPLA.
During connection and disconnection, the valve is closed, enabling connection/disconnection under zero line pressure.

All models of the series

NKU-B - NK CUPLA HOSE with HI CUPLA ACE

Model	Coupling part	Application	øHose length	øHose size	øPlug	øSocket
NKU-605B	plug / socket	ø6.5 mm×ø10 mm hose	5 m	ø6.5 mm×ø10 mm	65PNG	HA-65SNG
NKU-610B	plug / socket	ø6.5 mm×ø10 mm hose	10 m	ø6.5 mm×ø10 mm	65PNG	HA-65SNG
NKU-620B	plug / socket	ø6.5 mm×ø10 mm hose	20 m	ø6.5 mm×ø10 mm	65PNG	HA-65SNG
NKU-810B	plug / socket	ø8.5 mm×ø12.5 mm hose	10 m	ø8.5 mm×ø12.5 mm	85PNG	HA-85SNG
NKU-820B	plug / socket	ø8.5 mm×ø12.5 mm hose	20 m	ø8.5 mm×ø12.5 mm	85PNG	HA-85SNG

NKC-B - NK CUPLA COIL HOSE with HI CUPLA ACE

Model	Coupling part	Application	øHose size	øMaximum extensible length	øPlug	øSocket
NKC-503B	plug / socket	ø5 mm×ø8 mm hose	ø5 mm×ø8 mm	2 m	50PNG	HA-50SNG
NKC-505B	plug / socket	ø5 mm×ø8 mm hose	ø5 mm×ø8 mm	4 m	50PNG	HA-50SNG
NKC-603B	plug / socket	ø6.5 mm×ø10 mm hose	ø6.5 mm×ø10 mm	2 m	65PNG	HA-65SNG
NKC-605B	plug / socket	ø6.5 mm×ø10 mm hose	ø6.5 mm×ø10 mm	4 m	65PNG	HA-65SNG

NKU-P - NK CUPLA HOSE with FULL BLOW CUPLA

Model	Coupling part	Application	øHose length	øHose size	øPlug	øSocket
NKU-605P	plug / socket	ø6.5 mm×ø10 mm hose	5 m	ø6.5 mm×ø10 mm	65PNG	FBH-65SNG
NKU-610P	plug / socket	ø6.5 mm×ø10 mm hose	10 m	ø6.5 mm×ø10 mm	65PNG	FBH-65SNG
NKU-810P	plug / socket	ø8.5 mm×ø12.5 mm hose	10 m	ø8.5 mm×ø12.5 mm	85PNG	FBH-85SNG

NKC-P - NK CUPLA HOSE with FULL BLOW CUPLA (right-hand table on page 69, NKC coil hose models)

Model	Coupling part	Application	øHose length	øHose size	øPlug	øSocket
NKC-603P	plug / socket	ø6.5 mm×ø10 mm hose	2 m	ø6.5 mm×ø10 mm	65PNG	FBH-65SNG
NKC-605P	plug / socket	ø6.5 mm×ø10 mm hose	4 m	ø6.5 mm×ø10 mm	65PNG	FBH-65SNG

SH - Hose barb

Model	Coupling part	Application	Aluminium (g)	L	A	øoB	øoT
FBH-20SH	Socket	1/4 inch hose	70	(77)	30	5.5	9
FBH-30SH	Socket	3/8 inch hose	74	(81)	34	8	11.3
FBH-40SH	Socket	1/2 inch hose	85	(83)	36	10	15

SM - Male thread

Model	Coupling part	Application	Aluminium (g)	L	T	øH(WAF)	øoB
FBH-20SM	Socket	Rc 1/4	71	(62)	R 1/4	Hex.22	8
FBH-30SM	Socket	Rc 3/8	75	(62)	R 3/8	Hex.22	11
FBH-40SM	Socket	Rc 1/2	86	(66)	R 1/2	Hex.22	15

SF - Female thread

Model	Coupling part	Application	Aluminium (g)	L	T	øH(WAF)
FBH-20SF	Socket	R 1/4	77	(54.5)	Rc 1/4	Hex.22
FBH-30SF	Socket	R 3/8	69	(54.5)	Rc 3/8	Hex.22
FBH-40SF	Socket	R 1/2	90	(61)	Rc 1/2	Hex.26

SN - For urethane hose connection

Model	Coupling part	Application	Aluminium (g)	L	øH(WAF)	øT(WAF)	øoB
FBH-65SN	Socket	ø6.5 mm×ø10 mm	64	(64)	Hex.22	Hex.17	5.5
FBH-80SN	Socket	ø8 mm×ø12 mm	67	(66)	Hex.22	Hex.19	7.5
FBH-85SN	Socket	ø8.5 mm×ø12.5 mm	68	(66)	Hex.22	Hex.19	7.5
FBH-110SN	Socket	ø11 mm×ø16 mm	86	(71)	Hex.26	Hex.24	10

Dimensions in millimetres. Values in brackets apply in the connected condition.

Legend: L = overall length; H = width across flats or outside dimension; D = socket outside diameter; A = hose barb length; C = sleeve dimension; T = thread or barb size; B = bore

Series comparison

Series	Max working pressure	Size range	Valve structure	Applicable fluids
COMPACT ZEROSPILL CUPLA	10 bar	Thread 1/8 inch, 1/4 inch	Two-way shut-off (Spill Reduction)	Air, Water
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
FLOW MONITOR	10 bar	Rc 3/8 and Rc 1/2	-	Water
ANTI-VIBRATION PLUG HOSE	15 bar	R 1/4 (SHA-3-2R), R 3/8 (SHA-3-3R)	One-way shut-off	Air
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
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
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
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

Choose this series when the air line is to be supplied as a finished polyurethane hose assembly with the socket and the plug already fitted, rather than as separate couplings such as HI CUPLA BL, NUT CUPLA or LOCK CUPLA 200. The assemblies are rated 1.0 MPa {10 kgf/cm2} for the straight hose and 0.7 MPa {7 kgf/cm2} for the coil hose, so a line that has to run at the 1.5 MPa {15 kgf/cm2} of those peer series needs the separately supplied FULL BLOW CUPLA or another series. The shut-off is one-way and the fluid is air, so applications that call for two-way shut-off, as with COMPACT ZEROSPILL CUPLA, lie outside its scope.

Body and seal materials

Body material
Engineering plastics (PBT, POM) - socket body with HI CUPLA ACE
Aluminum alloy - socket body with FULL BLOW CUPLA
Steel (Chrome plated) - plug body

Seal material	Mark	Working temperature	Remarks
Nitrile rubber	NBR	-5 °C to +60 °C	Standard material

Further catalogue data

Note	Value
Specifications table on page 69, NK CUPLA HOSE with HI CUPLA ACE	Socket HI CUPLA ACE, socket body engineering plastics (PBT, POM), plug body steel (chrome plated), hose size ø6.5×ø10 and ø8.5×ø12.5, working pressure 1.0 MPa / 10 kgf/cm2 / 10 bar / 145 PSI
Specifications table on page 69, NK CUPLA COIL HOSE with HI CUPLA ACE	Socket HI CUPLA ACE, socket body engineering plastics (PBT, POM), plug body steel (chrome plated), hose size ø5×ø8 and ø6.5×ø10, working pressure 0.7 MPa / 7 kgf/cm2 / 7 bar / 102 PSI
Specifications table on page 69, NK CUPLA HOSE with FULL BLOW CUPLA	Socket FULL BLOW CUPLA, socket body aluminum alloy, plug body steel (chrome plated), hose size ø6.5×ø10 and ø8.5×ø12.5, working pressure 1.0 MPa / 10 kgf/cm2 / 10 bar / 145 PSI
Specifications table on page 69, NK CUPLA COIL HOSE with FULL BLOW CUPLA	Socket FULL BLOW CUPLA, socket body aluminum alloy, plug body steel (chrome plated), hose size ø6.5×ø10, working pressure 0.7 MPa / 7 kgf/cm2 / 7 bar / 102 PSI
FULL BLOW CUPLA size range (page 50)	Thread and hose barb 1/4 inch, 3/8 inch, 1/2 inch. SN type for urethane hose: for ø6.5 mm×ø10 mm and ø8 mm×ø12 mm polyurethane hose, and for ø8.5 mm×ø12.5 mm and ø11 mm×ø16 mm polyurethane hose.
FULL BLOW CUPLA maximum tightening torque in Nm {kgf.cm}	1/4 inch: 14 {143}, 3/8 inch: 22 {224}, 1/2 inch: 60 {612}
Tightening torque range, SN type for urethane hose, in Nm {kgf.cm}	9 to 11 {92 to 112}. To mount on urethane hose, slide it over to the hose barb and tighten the nut until it is flush against the hose barb base. It is recommended that grease is applied to the inside of the nut (threaded part and hose contact part) for easy tightening.
Flow direction with HI CUPLA ACE	Fluid flow can be bi-directional when socket and plug are connected.
Flow direction with FULL BLOW CUPLA	Fluid must run from socket side to plug side of the hose. Fluid must run from socket to plug.
Minimum cross-sectional area in mm2, FULL BLOW CUPLA socket row against plug columns 17PH, 20PH, 30PH, 40PH, 10PM, 20PM, 30PM, 40PM, 20PF, 30PF, 40PF	FBH-20SH: 16, 20, 24, 24, 13, 24, 24, 24, 24, 24, 24. FBH-30SH: 16, 20, 44, 44, 13, 44, 44, 44, 44, 44, 44. FBH-40SH: 16, 20, 44, 44, 13, 44, 44, 44, 44, 44, 44. FBH-20SM: 16, 20, 44, 44, 13, 44, 44, 44, 44, 44, 44. FBH-30SM: 16, 20, 44, 44, 13, 44, 44, 44, 44, 44, 44. FBH-40SM: 16, 20, 44, 44, 13, 44, 44, 44, 44, 44, 44. FBH-20SF: 16, 20, 44, 44, 13, 44, 44, 44, 44, 44, 44. FBH-30SF: 16, 20, 44, 44, 13, 44, 44, 44, 44, 44, 44. FBH-40SF: 16, 20, 44, 44, 13, 44, 44, 44, 44, 44, 44. FBH-65SN: 16, 20, 24, 24, 13, 24, 24, 24, 24, 24, 24. FBH-80SN: 16, 20, 44, 44, 13, 44, 44, 44, 44, 44, 44. FBH-85SN: 16, 20, 44, 44, 13, 44, 44, 44, 44, 44, 44. FBH-110SN: 16, 20, 44, 44, 13, 44, 44, 44, 44, 44, 44.
Socket outer diameter of FULL BLOW CUPLA sockets	ø28.5 for SH, SM, SF and SN type drawings on page 51
Accessory	SLEEVE COVER, soft plastic cover for FULL BLOW CUPLA. Easier sliding operation is achieved by attaching an additional plastic cover over the socket sleeve of FULL BLOW CUPLA. Plastic covers reduce the risk of damage if CUPLA strikes other components or products. Attach in the direction of the arrow, rounded part first. See page 164 for the details.
Included with NK CUPLA HOSE / NK CUPLA COIL HOSE with FULL BLOW CUPLA	Sleeve Cover included, Dust Cap included
How it works, step 1 - open the valve	Only after connection with the plug, you can slide the socket sleeve B toward the plug in order to open the built-in valve. Full flow path is then obtained.
How it works, step 2 - lock the sleeve	Rotate the flange counterclockwise to lock the sleeve B. Without unlocking the plug you cannot disconnect.
How it works, step 3 - purge the residual air	To disconnect the plug, first turn the flange back to its original position for unlocking and then pull the sleeve B back to the original position. The built-in valve will be closed to purge the residual air pressure. Air will be purged out under the sleeve B.
WAF	WAF stands for width across flats.
Flow rate	Pressure - flow rated characteristics (comparison with HI CUPLA) are printed only as a graph on page 50: curve 1 FBH-20SM×20PM, curve 2 FBH-30SM×30PM / FBH-40SM×40PM, plus HI CUPLA 30SM×30PM. Test conditions: fluid air. Axes: flow rate in m3/min (ANR) 0 to 4.5 against pressure 0 to 0.7 MPa {0 to 7 kgf/cm2}. The text states the flow rate is increased by up to 40% more than that of HI CUPLA. No numeric flow or Cv values are printed.

Interchangeability and size groups

NK CUPLA HOSE (page 69): interchangeable with HI CUPLA models 10, 17, 20, 30, 40 and 60. Interchangeable with each models of NUT CUPLA series and HI CUPLA series (except models 400, 600, and 800). Please see page 21 for HI CUPLA Series Interchangeability. FULL BLOW CUPLA (page 50): interchangeable with plugs of HI CUPLA models 10, 17, 20, 30 and 40. Interchangeable with each models of NUT CUPLA series and HI CUPLA series. Not interchangeable with some plugs of plastic HI CUPLA 250 (discontinued product). Please see page 21 for HI CUPLA Series Interchangeability.

Safety and application notes

Note: Direct mounting of FULL BLOW CUPLA to percussive and vibrating tools should be avoided.
Before use, please be sure to read "Safety Guide" described at the end of this book and "Instruction Sheet" that comes with the products.

All technical data on this page is taken from the Nitto Kohki general catalogue Quick Connect Couplings C01en-b, page 68. The complete catalogue is available for download on this page.

What are Cupla Hose with Full Blow Cupla pneumatic quick couplings and their primary industrial applications?

Cupla Hose with Full Blow Cupla are pneumatic quick-connect hose assemblies from Nitto Kohki featuring integrated full-blow discharge functionality that automatically expels residual compressed air when disconnected. These assemblies combine flexible pneumatic hose with quick-disconnect couplings in a single unit, eliminating the need for separate hose installation and reducing connection points. Primary applications include automated manufacturing lines, pneumatic tool operations, air blow guns for cleaning applications, and temporary pneumatic connections where rapid setup and teardown are required. Industries utilizing these assemblies include automotive assembly, electronics manufacturing, food processing, and general industrial automation where compressed air systems require frequent reconfiguration.

What are the key technical selection criteria for Nitto Kohki Cupla Hose assemblies?

Selection of Nitto Kohki Cupla Hose assemblies requires evaluation of coupling size designation, hose length, and pressure rating compatibility with the pneumatic system. The NKU series offers different port sizes including 6mm and 8mm configurations as indicated by model numbers NKU-605PW, NKU-610PW, and NKU-810PW variants. Standard hose lengths available include 5-meter and 10-meter options to accommodate workspace layout requirements. Operating pressure capability typically ranges from 0 to 1.0 MPa for standard pneumatic applications, while temperature range spans -5°C to +60°C for general industrial environments. Media compatibility centers on compressed air applications with proper filtration to prevent contamination of the quick-coupling mechanisms.

Which international standards and certifications apply to Nitto Kohki pneumatic quick couplings?

Nitto Kohki pneumatic quick couplings comply with ISO 4414 standards for pneumatic fluid power systems and general requirements for compressed air installations. The couplings meet JIS B 8390 Japanese Industrial Standards for pneumatic quick-connect fittings, ensuring compatibility with international pneumatic systems. Manufacturing processes follow ISO 9001 quality management standards for consistent production quality and traceability. For European markets, the products conform to EN ISO 12100 machine safety standards when integrated into pneumatic control systems. The Full Blow discharge mechanism aligns with workplace safety requirements by preventing accidental pressurized air release, supporting compliance with local occupational health and safety regulations across different industrial sectors.

What are the differences between NKU-605PW, NKU-610PW, and NKU-810PW Cupla Hose variants?

The primary differences between Nitto Kohki Cupla Hose variants lie in coupling port size and hose length configurations to match specific application requirements. NKU-605PW features a 6mm coupling diameter with 5-meter hose length, suitable for compact workstations and shorter pneumatic runs. NKU-610PW utilizes the same 6mm coupling size but extends to 10-meter hose length for applications requiring greater reach from the air supply point. NKU-810PW incorporates an 8mm coupling diameter with 10-meter hose, providing higher air flow capacity for pneumatic tools requiring increased air volume. All variants feature identical Full Blow Cupla discharge mechanisms and similar pressure ratings, with selection based on workspace geometry and air flow requirements rather than functional capabilities.

What installation requirements and system compatibility considerations apply to Full Blow Cupla assemblies?

Full Blow Cupla assemblies require compressed air systems operating within 0.1 to 1.0 MPa pressure range with proper air preparation including filtration to 40 microns and moisture removal to prevent internal component damage. Installation demands adequate workspace clearance for hose routing and coupling engagement, typically requiring 150mm minimum bend radius to prevent hose kinking. The assemblies connect directly to standard pneumatic outlets without additional adapters, featuring universal coupling compatibility with most industrial compressed air systems. System integration requires consideration of air consumption during full-blow discharge cycles, typically consuming 0.1 to 0.3 cubic meters of compressed air per disconnect operation. Proper installation includes securing hose runs to prevent wear from dragging and ensuring coupling protection from contamination when not in use.

What safety ratings and operating parameters apply to Nitto Kohki Full Blow Cupla systems?

Nitto Kohki Full Blow Cupla systems operate safely within temperature ranges of -5°C to +60°C for standard industrial environments, with maximum working pressure ratings of 1.0 MPa for compressed air applications. The integrated safety discharge mechanism automatically expels residual pressure upon disconnection, reducing operator exposure to high-pressure air release. Coupling materials typically achieve IP54 protection against dust ingress and water splash when properly maintained, suitable for general manufacturing environments but requiring protection in wash-down applications. The systems incorporate fail-safe design principles where coupling separation cannot occur under full system pressure without controlled discharge through the blow-off mechanism. Operating safety depends on regular inspection of hose integrity and coupling seal condition to prevent unexpected pressure loss during operation.

What maintenance schedule and service life expectations apply to Cupla Hose with Full Blow assemblies?

Cupla Hose with Full Blow assemblies require monthly visual inspection of hose condition for cuts, abrasion, or coupling looseness, with quarterly functional testing of the blow-off discharge mechanism to ensure proper operation. Service life typically extends 2 to 3 years under normal industrial conditions with proper air filtration and protection from mechanical damage. Critical maintenance points include annual replacement of internal sealing elements within the quick-coupling mechanism and immediate replacement of hoses showing surface cracking or dimensional changes. The blow-off valve mechanism requires annual calibration testing to verify discharge pressure settings remain within specification. Preventive maintenance includes protecting couplings from contamination during storage, maintaining proper air system filtration to 40 microns, and avoiding hose bend radius below manufacturer specifications to prevent premature failure.