Nitto Kohki supplies polyurethane compressed-air hoses in the NKU and NKC series, matched to HI Cupla quick couplings. The nine-item range covers various outer diameters and lengths: NKU-605B, NKU-610B, NKU-620B (6 mm OD), NKU-810B, NKU-820B (8 mm), and the NKC series in 5 and 6 mm (NKC-503B, NKC-505B, NKC-603B, NKC-605B). All hoses are polyurethane with NBR coupling inserts.
Polyurethane (PU) hoses offer good abrasion resistance, flexibility at low temperatures and low self-weight. The part number coding indicates outer diameter (5, 6 or 8 mm) and length in metres, for example NKU-610B denotes 6 mm diameter, 10 m length.
⚙Polyurethane material - good abrasion resistance, flexible even at low temperatures
✓NBR coupling inserts - compatible with the Nitto Kohki HI Cupla standard
⚡Outer diameters 5, 6 and 8 mm - NKU (6/8 mm) and NKC (5/6 mm) for different flow requirements
↕Lengths from 3 m to 20 m - NKU-605B (5 m), NKU-610B (10 m), NKU-620B (20 m), NKU-810B (10 m), NKU-820B (20 m)
✦Low self-weight - easy to handle for mobile compressed-air applications
Part number
OD
Length
Material
Seal
NKU-605B
6 mm
5 m
Polyurethane
NBR
NKU-610B
6 mm
10 m
Polyurethane
NBR
NKU-620B
6 mm
20 m
Polyurethane
NBR
NKU-810B
8 mm
10 m
Polyurethane
NBR
NKU-820B
8 mm
20 m
Polyurethane
NBR
NKC-503B
5 mm
3 m
Polyurethane
NBR
NKC-505B
5 mm
5 m
Polyurethane
NBR
NKC-603B
6 mm
3 m
Polyurethane
NBR
NKC-605B
6 mm
5 m
Polyurethane
NBR
Typical applications: Compressed-air supply to mobile pneumatic tools at Nitto Kohki HI Cupla stations, hose connections in manufacturing, assembly and workshop environments, applications requiring frequent coupling and decoupling, and situations where PU hoses are preferred over PVC due to better cold-temperature flexibility.
Technical data from the manufacturer catalogue
Series
NK CUPLA HOSE Series
Body material
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)
Nitrile rubber (NBR), DUSTER CUPLA: -20 to +60 deg C | Nitrile rubber (NBR), NK CUPLA HOSE / NK CUPLA COIL HOSE: -5 to +60 deg 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
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
Catalogue page
C01en-b, 67
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.
Air line coupling with air blower function (DUSTER CUPLA)
Three functions in one: connection, air blow, hose twist release! Dust blow without detaching the tool!
HI CUPLA comes with compact air blow function.
Improves job efficiency by air blow with tool still connected to hose.
Ball bearing swivel mechanism prevents hose twist and relieves tension on operator's hand.
Special design of air blow button switch is free from in line air pressure - no hard press down required.
Also simple is routine water drain from air line before starting daily work.
Couplings with polyurethane hose for air lines (NK CUPLA HOSE / NK CUPLA COIL HOSE)
All models of the series
DCS-PH - Hose barb (DUSTER CUPLA, PH type)
Model
Coupling part
Application
Total (g)
L
H
A
øøB
øøT
DCS-20PH
Socket
1/4 inch hose
168
(117.9)
40.5
30
5
9
DCS-30PH
Socket
3/8 inch hose
171
(121.9)
40.5
34
7.5
11.3
DCS-40PH
Socket
1/2 inch hose
193
(123.9)
40.5
36
7.5
15
DCS-PNG - For hose with hose guard nut connection (DUSTER CUPLA, PNG type)
Model
Coupling part
Application
Total (g)
L
H
A
øH(WAF)
øT(WAF)
øøB
DCS-65PNG
Socket
ø6.5 mm x ø10 mm hose
176
(176.9)
40.5
90
Hex.17
Hex.19
5.3
DCS-85PNG
Socket
ø8.5 mm x ø12.5 mm hose
185
(176.9)
40.5
90
Hex.19
Hex.22
7.5
NKU-ACE - NK CUPLA HOSE with HI CUPLA ACE
Model
Coupling part
Application
NKU-605B
plug / socket hose assembly
Hose ø6.5 mm x ø10 mm, hose length 5 m; socket HA-65SNG (HI CUPLA ACE), plug 65PNG (NUT CUPLA)
NKU-610B
plug / socket hose assembly
Hose ø6.5 mm x ø10 mm, hose length 10 m; socket HA-65SNG (HI CUPLA ACE), plug 65PNG (NUT CUPLA)
NKU-620B
plug / socket hose assembly
Hose ø6.5 mm x ø10 mm, hose length 20 m; socket HA-65SNG (HI CUPLA ACE), plug 65PNG (NUT CUPLA)
NKU-810B
plug / socket hose assembly
Hose ø8.5 mm x ø12.5 mm, hose length 10 m; socket HA-85SNG (HI CUPLA ACE), plug 85PNG (NUT CUPLA)
NKU-820B
plug / socket hose assembly
Hose ø8.5 mm x ø12.5 mm, hose length 20 m; socket HA-85SNG (HI CUPLA ACE), plug 85PNG (NUT CUPLA)
NKC-ACE - NK CUPLA COIL HOSE with HI CUPLA ACE
Model
Coupling part
Application
NKC-503B
plug / socket hose assembly
Hose ø5 mm x ø8 mm, maximum extensible length 2 m; socket HA-50SNG (HI CUPLA ACE), plug 50PNG (NUT CUPLA)
NKC-505B
plug / socket hose assembly
Hose ø5 mm x ø8 mm, maximum extensible length 4 m; socket HA-50SNG (HI CUPLA ACE), plug 50PNG (NUT CUPLA)
NKC-603B
plug / socket hose assembly
Hose ø6.5 mm x ø10 mm, maximum extensible length 2 m; socket HA-65SNG (HI CUPLA ACE), plug 65PNG (NUT CUPLA)
NKC-605B
plug / socket hose assembly
Hose ø6.5 mm x ø10 mm, maximum extensible length 4 m; socket HA-65SNG (HI CUPLA ACE), plug 65PNG (NUT CUPLA)
NKU-FB - NK CUPLA HOSE with FULL BLOW CUPLA
Model
Coupling part
Application
NKU-605P
plug / socket hose assembly
Hose ø6.5 mm x ø10 mm, hose length 5 m; socket FBH-65SNG (FULL BLOW CUPLA), plug 65PNG (NUT CUPLA)
NKU-610P
plug / socket hose assembly
Hose ø6.5 mm x ø10 mm, hose length 10 m; socket FBH-65SNG (FULL BLOW CUPLA), plug 65PNG (NUT CUPLA)
NKU-810P
plug / socket hose assembly
Hose ø8.5 mm x ø12.5 mm, hose length 10 m; socket FBH-85SNG (FULL BLOW CUPLA), plug 85PNG (NUT CUPLA)
NKC-FB - NK CUPLA HOSE with FULL BLOW CUPLA (block heading as printed; the models listed in this block are NKC coil hose models)
Model
Coupling part
Application
NKC-603P
plug / socket hose assembly
Hose ø6.5 mm x ø10 mm, hose length 2 m; socket FBH-65SNG (FULL BLOW CUPLA), plug 65PNG (NUT CUPLA)
NKC-605P
plug / socket hose assembly
Hose ø6.5 mm x ø10 mm, hose length 4 m; socket FBH-65SNG (FULL BLOW CUPLA), plug 65PNG (NUT CUPLA)
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
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
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
Choose this series when the job calls for a ready made air line rather than a loose coupling: NK CUPLA HOSE and NK CUPLA COIL HOSE are supplied as polyurethane hose assemblies with a HI CUPLA ACE or FULL BLOW CUPLA socket at one end and a NUT CUPLA plug at the other, and DUSTER CUPLA adds the air blow button switch and the ball bearing swivel. All versions are one-way shut-off and for air only, at 1.0 MPa {10 kgf/cm2} for the straight hose and 0.7 MPa {7 kgf/cm2} for the coil hose, so a line running up to 1.5 MPa {15 kgf/cm2} calls for HI CUPLA BL, NUT CUPLA, LOCK CUPLA 200 or ROTARY LINE CUPLA instead. Where liquid spillage on disconnection has to be limited, COMPACT ZEROSPILL CUPLA is the two-way shut-off alternative at 1.0 MPa {10 kgf/cm2}.
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)
Seal material
Mark
Working temperature
Remarks
Nitrile rubber (NBR), DUSTER CUPLA
-
-20 to +60 deg C
-
Nitrile rubber (NBR), NK CUPLA HOSE / NK CUPLA COIL HOSE
-
-5 to +60 deg C
-
Further catalogue data
Note
Value
Tightening torque range, DUSTER CUPLA 65PNG
5 to 6 Nm {51 to 61 kgf-cm}
Tightening torque range, DUSTER CUPLA 85PNG
7 to 8 Nm {71 to 82 kgf-cm}
Flow direction, DUSTER CUPLA
Fluid must run from socket to plug.
Flow direction, NK CUPLA HOSE with HI CUPLA ACE
Fluid flow can be bi-directional when socket and plug are connected.
Flow direction, NK CUPLA HOSE with FULL BLOW CUPLA
Fluid must run from socket side to plug side of the hose.
NK CUPLA HOSE with HI CUPLA ACE - socket body material and pressure
Engineering plastics (PBT, POM); 1.0 MPa / 10 kgf/cm2 / 10 bar / 145 PSI; hose ø6.5 x ø10, ø8.5 x ø12.5
NK CUPLA COIL HOSE with HI CUPLA ACE - socket body material and pressure
Engineering plastics (PBT, POM); 0.7 MPa / 7 kgf/cm2 / 7 bar / 102 PSI; hose ø5 x ø8, ø6.5 x ø10
NK CUPLA HOSE with FULL BLOW CUPLA - socket body material and pressure
Aluminum alloy; 1.0 MPa / 10 kgf/cm2 / 10 bar / 145 PSI; hose ø6.5 x ø10, ø8.5 x ø12.5
NK CUPLA COIL HOSE with FULL BLOW CUPLA - socket body material and pressure
Aluminum alloy; 0.7 MPa / 7 kgf/cm2 / 7 bar / 102 PSI; hose ø6.5 x ø10
Included with the FULL BLOW CUPLA hose assemblies
Sleeve Cover included, Dust Cap included
Flow rate
Pressure - Flow Characteristics chart on page 68 (DUSTER CUPLA). [Test conditions] -Fluid : Air. Curves plotted: DCS-30PH x 20PM, DCS-40PH x 20PM, DCS-85PNG x 20PM, DCS-65PNG x 20PM, DCS-20PH x 20PM. Flow rate in m3/min (ANR) from 0 to 2.5 against pressure in MPa {kgf/cm2} from 0 to 0.7 {7}.
Interchangeability and size groups
DUSTER CUPLA: Interchangeable with plugs of HI CUPLA models 10, 17, 20, 30, 40 and 60. Interchangeable with each models of NUT CUPLA series and HI CUPLA series. Please see page 21 for "HI CUPLA Series Interchangeability". NK CUPLA HOSE / NK CUPLA COIL HOSE: 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".
Safety and application notes
Before use, please be sure to read "Safety Guide" described at the end of this book and "Instruction Sheet" that comes with the products.
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.
All technical data on this page is taken from the Nitto Kohki general catalogue Quick Connect Couplings C01en-b, page 67. The complete catalogue is available for download on this page.
