Nut Cupla
Quick couplings
The Nitto Kohki Nut Cupla is a threaded-nut quick coupling for compressed-air lines, secured by a grooved locking geometry. The range covers 25 items across the PN (plug) and SN (socket) series in steel with NBR seals, in nominal sizes 50, 60, 65, 80, 85 and 110, plus the reinforced 200 series for heavier-duty line connections. Variants with the G suffix (e.g. 65PNG, 85SNG) are earthed versions for use in potentially explosive atmospheres.
Steel body with NBR seal - robust construction for general compressed-air duty
PN and SN series - plug (P) and socket (S) in matching nominal sizes
G variants (PNG / SNG) - earthed design for Ex zones, e.g. 65PNG and 85SNG
200 series - reinforced version for nominal sizes 50 to 110 as SN socket
BL variants - 65SN-BL, 80SN-BL, 85SN-BL with shut-off valve (blind-plug function)
| Criterion | Option |
|---|---|
| Nominal size | 50, 60, 65, 80, 85, 110 (PN/SN series); 50-110 (200 series) |
| Connector type | PN / PNG (plug), SN / SNG (socket) |
| Body material | Steel |
| Seal | NBR (standard) |
| Ex protection | G variants (PNG / SNG) earthed |
| Shut-off valve | BL variants (65SN-BL, 80SN-BL, 85SN-BL) |
Typical applications: Compressed-air distribution in production and assembly halls, pneumatic tools at compressor stations, pipe connections requiring a locked threaded joint, and use in potentially explosive atmospheres with the earthed G variants.
Technical data from the manufacturer catalogue
| Series | NUT CUPLA / NUT CUPLA 200 / ROTARY NUT CUPLA / HI CUPLA for Connection to Braided Hoses |
|---|---|
| Body material | Steel (chrome plated), Stainless steel (SUS304), Brass (HI CUPLA for Connection to Braided Hoses) |
| Seal material | NBR (Nitrile rubber) |
| Max working pressure | 1.5 MPa {15 kgf/cm2}; 1.0 MPa {10 kgf/cm2} for the brass models of HI CUPLA for Connection to Braided Hoses |
| Working temperature | NBR (Nitrile rubber), NUT CUPLA / NUT CUPLA 200 / ROTARY NUT CUPLA: -20 to +60 deg C | NBR (Nitrile rubber), HI CUPLA for Connection to Braided Hoses: -20 to +80 deg C |
| Valve structure | One-way shut-off |
| Applicable fluids | Air, Water |
| Vacuum service | Not suitable for vacuum application in either connected or disconnected condition. |
| Size range | Urethane hose ø5 mm x ø8 mm to ø11 mm x ø16 mm; braided hose ø9 mm x ø15 mm |
| Catalogue page | C01en-b, 45 |
Operating principle
- For connection to urethane hose, braided hose.
- No hose clamp required.
- Fitted with hose guard nut to prevent possible kinking.
- HI CUPLA for connection to braided hoses is now available.
- Nut types are available in HI CUPLA Series and HI CUPLA 200 Series.
- Hose guard nut type available to prevent hose kinking.
- To mount on hose, simply slide it over the nipple and tighten the nut.
- The design to tighten outside of hose reduces hose slip away or fluid leaks.
All models of the series
PN-BH - Nut connection for braided hose (HI CUPLA for connection to braided hoses)
| Model | Coupling part | Application | Steel (g) | Brass (g) | L | C | øH1(WAF) | øH2(WAF) | øøB |
|---|---|---|---|---|---|---|---|---|---|
| 90PN-BH | Plug | ø9 x ø15 braided hose, hose wall thickness 3±0.3 mm | 86 | 88 | (51) | 20 | Hex.23 | Hex.24 | 7.5 |
SN-BH - Nut connection for braided hose (HI CUPLA for connection to braided hoses)
| Model | Coupling part | Application | Steel (g) | Brass (g) | L | øH1(WAF) | øH2(WAF) | øøB | øøD |
|---|---|---|---|---|---|---|---|---|---|
| 90SN-BH | Socket | ø9 x ø15 braided hose, hose wall thickness 3±0.3 mm | 147 | 154 | (64.5) | Hex.24 | Hex.24 | 8.5 | (26.5) |
PN - Nut connection for urethane hose (NUT CUPLA)
| Model | Coupling part | Application | Steel (g) | Stainless steel (g) | L | C | øH(WAF) | øT(WAF) | øøBd | øøBp |
|---|---|---|---|---|---|---|---|---|---|---|
| 50PN | Plug | ø5 x ø8 urethane hose | 30 | - | (43) | 20 | Hex.17 | Hex.17 | 7.5 | 4.5 |
| 60PN | Plug | ø6 x ø9 urethane hose | 40 | - | (43) | 20 | Hex.17 | Hex.17 | 7.5 | 5.3 |
| 65PN | Plug | ø6.5 x ø10 urethane hose | 42 | 43 | (43) | 20 | Hex.17 | Hex.17 | 7.5 | 5.3 |
| 80PN | Plug | ø8 x ø12 urethane hose | 50 | 52 | (45) | 20 | Hex.19 | Hex.19 | 7.5 | 7.5 |
| 85PN | Plug | ø8.5 x ø12.5 urethane hose | 52 | 53 | (45) | 20 | Hex.19 | Hex.19 | 7.5 | 7.5 |
| 110PN | Plug | ø11 x ø16 urethane hose | 75 | - | (52) | 20 | Hex.23 | Hex.24 | 7.5 | 7.5 |
SN - Nut connection for urethane hose (NUT CUPLA)
| Model | Coupling part | Application | Steel (g) | Stainless steel (g) | L | øH(WAF) | øT(WAF) | øøB | øøD |
|---|---|---|---|---|---|---|---|---|---|
| 50SN | Socket | ø5 x ø8 urethane hose | 117 | - | (60) | Hex.19 | Hex.17 | 4.5 | (26.5) |
| 60SN | Socket | ø6 x ø9 urethane hose | 115 | - | (59.5) | Hex.19 | Hex.17 | 5.3 | (26.5) |
| 65SN | Socket | ø6.5 x ø10 urethane hose | 115 | 110 | (59.5) | Hex.19 | Hex.17 | 5.3 | (26.5) |
| 80SN | Socket | ø8 x ø12 urethane hose | 120 | 114 | (61.5) | Hex.19 | Hex.19 | 7.5 | (26.5) |
| 85SN | Socket | ø8.5 x ø12.5 urethane hose | 120 | 115 | (61.5) | Hex.19 | Hex.19 | 7.5 | (26.5) |
| 110SN | Socket | ø11 x ø16 urethane hose | 153 | - | (64.5) | Hex.23 | Hex.24 | 10 | (26.5) |
200-SN - Nut connection for urethane hose (NUT CUPLA 200)
| Model | Coupling part | Application | Total (g) | L | øH(WAF) | øT(WAF) | øøB | øøD |
|---|---|---|---|---|---|---|---|---|
| 200-50SN | Socket | ø5 x ø8 urethane hose | 105 | (64.5) | Hex.19 | Hex.17 | 4.5 | (26.5) |
| 200-60SN | Socket | ø6 x ø9 urethane hose | 105 | (64.5) | Hex.19 | Hex.17 | 5.3 | (26.5) |
| 200-65SN | Socket | ø6.5 x ø10 urethane hose | 106 | (64.5) | Hex.19 | Hex.17 | 5.3 | (26.5) |
| 200-80SN | Socket | ø8 x ø12 urethane hose | 112 | (66.5) | Hex.19 | Hex.19 | 7.5 | (26.5) |
| 200-85SN | Socket | ø8.5 x ø12.5 urethane hose | 113 | (66.5) | Hex.19 | Hex.19 | 7.5 | (26.5) |
| 200-110SN | Socket | ø11 x ø16 urethane hose | 127 | (62) | Hex.23 | Hex.24 | 10 | (26.5) |
PNG - Nut connection for urethane hose with hose guard nut
| Model | Coupling part | Application | Total (g) | L | A | C | øH(WAF) | øT(WAF) | øøBd | øøBp | øøD |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 50PNG | Plug | ø5 x ø8 urethane hose | 41 | (116) | 90 | 20 | Hex.17 | Hex.19 | 7.5 | 4.5 | 23 |
| 65PNG | Plug | ø6.5 x ø10 urethane hose | 43 | (116) | 90 | 20 | Hex.17 | Hex.19 | 7.5 | 5.3 | 23 |
| 85PNG | Plug | ø8.5 x ø12.5 urethane hose | 55 | (116) | 90 | 20 | Hex.19 | Hex.22 | 7.5 | 7.5 | 26 |
200-SNG - Nut connection for urethane hose with hose guard nut (NUT CUPLA 200)
| Model | Coupling part | Application | Total (g) | L | A | øH(WAF) | øT(WAF) | øøB | øøD |
|---|---|---|---|---|---|---|---|---|---|
| 200-50SNG | Socket | ø5 x ø8 urethane hose | 105 | (137.5) | 90 | Hex.19 | Hex.19 | 4.5 | (26.5) |
| 200-65SNG | Socket | ø6.5 x ø10 urethane hose | 107 | (137.5) | 90 | Hex.19 | Hex.19 | 5.3 | (26.5) |
| 200-85SNG | Socket | ø8.5 x ø12.5 urethane hose | 116 | (137.5) | 90 | Hex.19 | Hex.22 | 7.5 | (26.5) |
SNR - Nut connection for urethane hose, ROTARY NUT CUPLA with swivel mechanism
| Model | Coupling part | Application | Total (g) | L | øH(WAF) | øT(WAF) | øøB | øøD |
|---|---|---|---|---|---|---|---|---|
| 65SNR | Socket | ø6.5 x ø10 urethane hose | 120 | (67.3) | Hex.19 | Hex.17 | 5.3 | (26.5) |
| 85SNR | Socket | ø8.5 x ø12.5 urethane hose | 136 | (69.3) | Hex.21 | Hex.19 | 7.5 | (26.5) |
SNRG - Nut connection for urethane hose with hose guard nut, ROTARY NUT CUPLA with swivel mechanism
| Model | Coupling part | Application | Total (g) | L | A | øH(WAF) | øT(WAF) | øøB | øøD |
|---|---|---|---|---|---|---|---|---|---|
| 65SNRG | Socket | ø6.5 x ø10 urethane hose | 121 | (140.3) | 90 | Hex.19 | Hex.19 | 5.3 | (26.5) |
| 85SNRG | Socket | ø8.5 x ø12.5 urethane hose | 139 | (140.3) | 90 | Hex.21 | Hex.22 | 7.5 | (26.5) |
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 |
| 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 |
| 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 |
| 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 |
NUT CUPLA is the choice where the coupling sits on urethane or braided hose and the hose has to be held by a threaded nut rather than a hose clamp; the other one-way shut-off series in this group at 1.5 MPa {15 kgf/cm2}, such as HI CUPLA BL, LOCK CUPLA 200, ROTARY LINE CUPLA and ROTARY PLUG, are selected for their locking or swivel function rather than for the hose mounting. The hose guard nut versions (PNG, 200-SNG) add protection against kinking, and ROTARY NUT CUPLA combines the nut mounting with a ball bearing swivel mechanism. If spill on disconnection is the deciding point, COMPACT ZEROSPILL CUPLA at 1.0 MPa {10 kgf/cm2} is two-way shut-off, while NUT CUPLA is one-way shut-off and requires flow from socket to plug.
Body and seal materials
| Body material |
|---|
| Steel (chrome plated) |
| Stainless steel (SUS304) |
| Brass (HI CUPLA for Connection to Braided Hoses) |
| Seal material | Mark | Working temperature | Remarks |
|---|---|---|---|
| NBR (Nitrile rubber), NUT CUPLA / NUT CUPLA 200 / ROTARY NUT CUPLA | - | -20 to +60 deg C | - |
| NBR (Nitrile rubber), HI CUPLA for Connection to Braided Hoses | - | -20 to +80 deg C | - |
Further catalogue data
| Note | Value |
|---|---|
| Applicable fluids note | Steel applies to air only. |
| Working pressure (all units) | NUT CUPLA / NUT CUPLA 200 / ROTARY NUT CUPLA and steel braided hose models: 1.5 MPa, 15 kgf/cm2, 15 bar, 218 PSI. Brass braided hose models: 1.0 MPa, 10 kgf/cm2, 10 bar, 145 PSI |
| Urethane hose size | For ø5 mm x ø8 mm, ø6 mm x ø9 mm hose; for ø6.5 mm x ø10 mm, ø8 mm x ø12 mm hose; for ø8.5 mm x ø12.5 mm, ø11 mm x ø16 mm hose |
| Braided hose size | For ø9 mm x ø15 mm hose |
| Body material (NUT CUPLA / NUT CUPLA 200 / ROTARY NUT CUPLA) | Steel (chrome plated), stainless steel (SUS304) |
| Body material (HI CUPLA for Connection to Braided Hoses) | Steel (chrome plated), brass |
| Braided hose pressure note | Maximum working pressure and temperature range of PN/SN type for braided hoses depends upon the specification of the braided hose to be used. |
| Tightening torque range - SN, PN, SNR type | 9 to 11 Nm {92 to 112 kgf cm} |
| Tightening torque range - 65SNG, PNG, SNRG type | 5 to 6 Nm {51 to 61 kgf cm} |
| Tightening torque range - 85SNG, PNG, SNRG type | 7 to 8 Nm {71 to 82 kgf cm} |
| Mounting | To mount on braided hose or 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 | Fluid must run from socket to plug. |
| Grease note | Grease is applied to the threaded part of the steel nut (PN-BH and SN-BH types) and to the threaded part of the stainless steel nut (PN, SN and 200-SN types) to prevent galling. |
| Seal material remark | NBR is the standard material. |
| Minimum cross-sectional area (mm2) - plug columns | The table on page 46 is read in the plug order 17PH, 20PH, 30PH, 40PH, 10PM, 20PM, 30PM, 40PM, 20PF, 30PF, 40PF, 90PN-BH |
| Minimum cross-sectional area (mm2) - 200-50SN | 16, 16, 16, 16, 13, 16, 16, 16, 16, 16, 16, 16 |
| Minimum cross-sectional area (mm2) - 200-60SN | 16, 20, 22, 22, 13, 22, 22, 22, 22, 22, 22, 22 |
| Minimum cross-sectional area (mm2) - 200-65SN | 16, 20, 22, 22, 13, 22, 22, 22, 22, 22, 22, 22 |
| Minimum cross-sectional area (mm2) - 200-80SN | 16, 20, 41, 41, 13, 41, 41, 41, 41, 41, 41, 41 |
| Minimum cross-sectional area (mm2) - 200-85SN | 16, 20, 41, 41, 13, 41, 41, 41, 41, 41, 41, 41 |
| Minimum cross-sectional area (mm2) - 200-110SN | 16, 20, 41, 41, 13, 41, 41, 41, 41, 41, 41, 41 |
| Minimum cross-sectional area (mm2) - 200-50SNG | 16, 16, 16, 16, 13, 16, 16, 16, 16, 16, 16, 16 |
| Minimum cross-sectional area (mm2) - 200-65SNG | 16, 20, 22, 22, 13, 22, 22, 22, 22, 22, 22, 22 |
| Minimum cross-sectional area (mm2) - 200-85SNG | 16, 20, 40, 41, 13, 41, 41, 41, 41, 41, 41, 41 |
| Minimum cross-sectional area (mm2) - 90SN-BH | 16, 20, 33, 33, 13, 33, 33, 33, 33, 33, 33, 33 |
| Flow rate | Pressure - Flow Characteristics graph on page 46, test fluid air, pressure 0 to 0.7 MPa {7 kgf/cm2} and flow rate 0 to 3.0 m3/min (ANR), plotted for 200-85SN (G) x 30PM, 85SNR (G) x 30PM, 90SN-BH x 90PN-BH, 200-65SN (G) x 20PM and 65SNR (G) x 20PM. |
Interchangeability and size groups
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 the Safety Guide described at the end of this book and the Instruction Sheet that comes with the products.
- Not suitable for vacuum application in either connected or disconnected condition.
- Fluid must run from socket to plug.
- Grease is applied to the threaded part of the steel nut and of the stainless steel nut to prevent galling.
All technical data on this page is taken from the Nitto Kohki general catalogue Quick Connect Couplings C01en-b, page 45. The complete catalogue is available for download on this page.
