HI Cupla BL
Quick couplings
The Nitto Kohki HI Cupla BL is a quick coupling in steel and stainless steel (SUS) with NBR seal and ball-lock retention (BL: Ball Lock). The programme includes 18 items in plug (SH) and socket configurations across nominal sizes 20, 30, and 40. The BL locking uses a ball-detent mechanism that reliably secures the connection under pressure and vibration. Stainless steel versions (SUS) provide enhanced corrosion resistance for aggressive environments.
| Type | Nominal size | Material | Seal | Lock |
|---|---|---|---|---|
| 20SH-BL | 20 | Steel | NBR | Ball Lock |
| 30SH-BL | 30 | Steel | NBR | Ball Lock |
| 40SH-BL | 40 | Steel | NBR | Ball Lock |
| 20SM-BL | 20 | Steel | NBR | Ball Lock |
| 30SM-BL | 30 | Steel | NBR | Ball Lock |
| 40SM-BL | 40 | Steel | NBR | Ball Lock |
| 20SH-BL (SUS) | 20 | Stainless steel | NBR | Ball Lock |
Typical applications: Compressed-air lines on vibration-loaded machines and vehicles, chemical and petrochemical plants where corrosion resistance is required (SUS), coupling of air lines under working pressure without full depressurisation, and pneumatic systems requiring an easily releasable yet vibration-proof connection.
Technical data from the manufacturer catalogue
| Series | HI CUPLA BL |
|---|---|
| Body material | Steel (chrome plated), Stainless steel (SUS304) |
| Seal material | Nitrile rubber (NBR) |
| Max working pressure | 1.5 MPa {15 kgf/cm2} |
| Working temperature | Nitrile rubber (NBR), standard material: -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 | 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 |
| Catalogue page | C01en-b, 41 |
Operating principle
- Separation prevention mechanism prevents accidental disconnection.
- An excellent general purpose coupling for connecting factory air supply to pneumatic tools.
- Steel coupling is suitable for air. Stainless steel is suitable for water. Note that fluid will come out from the plug when disconnected.
- Critical structural parts made of steel are heat-treated for increased strength giving greater durability and resistance to wear.
- Various body materials, sizes, and end configurations are available.
- SN-BL type for connection to urethane hose requires no hose clamp.
- Separation prevention mechanism is easily locked by turning the sleeve after connection.
All models of the series
SH-BL - Hose barb
| Model | Coupling part | Application | Steel (g) | Stainless steel (g) | L | øD | A | T | øB |
|---|---|---|---|---|---|---|---|---|---|
| 20SH-BL | Socket | 1/4 inch hose | 103 | - | (72.5) | (26.5) | 30 | 9 | 5 |
| 30SH-BL | Socket | 3/8 inch hose | 106 | - | (76.5) | (26.5) | 34 | 11.3 | 7.5 |
| 40SH-BL | Socket | 1/2 inch hose | 118 | - | (78.5) | (26.5) | 36 | 15 | 9 |
| 20SH-BL | Socket | 1/4 inch hose | - | 100 | (72.5) | 25.4 | 30 | 9 | 5 |
| 30SH-BL | Socket | 3/8 inch hose | - | 101 | (76.5) | 25.4 | 34 | 11.3 | 7.5 |
| 40SH-BL | Socket | 1/2 inch hose | - | 118 | (78.5) | 25.4 | 36 | 15 | 9 |
SM-BL - Male thread
| Model | Coupling part | Application | Steel (g) | Stainless steel (g) | L | H | øD | T | øB |
|---|---|---|---|---|---|---|---|---|---|
| 20SM-BL | Socket | Rc 1/4 | 101 | - | (55.5) | Hex.19 | (26.5) | R 1/4 | 7 |
| 30SM-BL | Socket | Rc 3/8 | 108 | - | (56.5) | Hex.19 | (26.5) | R 3/8 | 8 |
| 40SM-BL | Socket | Rc 1/2 | 131 | - | (59.5) | Hex.23 | (26.5) | R 1/2 | 9 |
| 20SM-BL | Socket | Rc 1/4 | - | 96 | (55.5) | Hex.19 | 25.4 | R 1/4 | 7 |
| 30SM-BL | Socket | Rc 3/8 | - | 105 | (56.5) | Hex.19 | 25.4 | R 3/8 | 9 |
| 40SM-BL | Socket | Rc 1/2 | - | 120 | (59.5) | Hex.22 | 25.4 | R 1/2 | 9 |
SF-BL - Female thread
| Model | Coupling part | Application | Steel (g) | Stainless steel (g) | L | H | øD | T |
|---|---|---|---|---|---|---|---|---|
| 20SF-BL | Socket | R 1/4 | 95 | - | (49.5) | Hex.19 | (26.5) | Rc 1/4 |
| 30SF-BL | Socket | R 3/8 | 103 | - | (50.5) | Hex.21 | (26.5) | Rc 3/8 |
| 40SF-BL | Socket | R 1/2 | 139 | - | (52.5) | Hex.29 | (26.5) | Rc 1/2 |
| 20SF-BL | Socket | R 1/4 | - | 98 | (49.5) | Hex.19 | 25.4 | Rc 1/4 |
| 30SF-BL | Socket | R 3/8 | - | 99 | (50.5) | Hex.21 | 25.4 | Rc 3/8 |
| 40SF-BL | Socket | R 1/2 | - | 138 | (52.5) | Hex.29 | 25.4 | Rc 1/2 |
SN-BL - For urethane hose connection
| Model | Coupling part | Application | Steel (g) | L | H | øD | T | øB |
|---|---|---|---|---|---|---|---|---|
| 65SN-BL | Socket | 6.5 x 10 mm hose | 115 | (59.5) | Hex.19 | (26.5) | Hex.17 | 5.3 |
| 80SN-BL | Socket | 8 x 12 mm hose | 120 | (61.5) | Hex.19 | (26.5) | Hex.19 | 7.5 |
| 85SN-BL | Socket | 8.5 x 12.5 mm hose | 120 | (61.5) | Hex.19 | (26.5) | Hex.19 | 7.5 |
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 |
| 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 |
HI CUPLA BL suits a 1.5 MPa {15 kgf/cm2} line that has to be secured against accidental disconnection: it is one-way shut-off like NUT CUPLA, LOCK CUPLA 200, HI CUPLA Two Way Type, ROTARY LINE CUPLA, ROTARY FULL BLOW LINE CUPLA and ROTARY PLUG at the same pressure, but adds the sleeve lock. Where no fluid may escape at disconnection, COMPACT ZEROSPILL CUPLA shuts off on both sides, at the cost of a working pressure limited to 1.0 MPa {10 kgf/cm2}; the same 1.0 MPa {10 kgf/cm2} limit applies to TWIST PLUG. Up to 1.5 MPa {15 kgf/cm2} all of these series are candidates, so the decision rests on the locking requirement rather than on the pressure rating.
Body and seal materials
| Body material |
|---|
| Steel (chrome plated) |
| Stainless steel (SUS304) |
| Seal material | Mark | Working temperature | Remarks |
|---|---|---|---|
| Nitrile rubber (NBR), standard material | - | -20 to +80 deg C | - |
Further catalogue data
| Note | Value |
|---|---|
| Applicable fluids note | Applicable fluids (Steel applies to air only) |
| Flow direction | Fluid must run from socket to plug. |
| Maximum tightening torque, steel, Nm {kgf cm} | 1/4 inch: 14 {143}, 3/8 inch: 22 {224}, 1/2 inch: 60 {612} |
| Maximum tightening torque, stainless steel, 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, Nm {kgf cm} | 9 to 11 {92 to 112} |
| Urethane hose mounting | 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 GRE-M1 is applied to the inside of the nut (threaded part and hose contact part) for easy tightening. |
| Minimum cross-sectional area (mm2), socket 20SH-BL | 17PH 16, 20PH 20, 30PH 20, 40PH 20, 10PM 13, 20PM 20, 30PM 20, 40PM 20, 20PF 20, 30PF 20, 40PF 20 |
| Minimum cross-sectional area (mm2), sockets 20SM-BL, 20SF-BL, 30SH-BL, 30SM-BL, 30SF-BL, 40SH-BL, 40SM-BL, 40SF-BL, 80SN-BL, 85SN-BL | 17PH 16, 20PH 20, 30PH 33, 40PH 33, 10PM 13, 20PM 33, 30PM 33, 40PM 33, 20PF 33, 30PF 33, 40PF 33 |
| Minimum cross-sectional area (mm2), socket 65SN-BL | 17PH 16, 20PH 20, 30PH 22, 40PH 22, 10PM 13, 20PM 22, 30PM 22, 40PM 22, 20PF 22, 30PF 22, 40PF 22 |
| Locking and unlocking | Align the cutout in the sleeve with the ball stopper, and pull the sleeve to connect the plug. Without alignment of the cutout with the ball stopper disconnection cannot be made, so accidental disconnection is prevented. Align the cutout in the sleeve with the ball stopper, and pull the sleeve for disconnection. The stopper is marked with blue for visual understanding. |
| Flow rate | Pressure - flow characteristics graph on page 42. Test conditions: fluid air. Curves printed: 1) 40SM-BL x 40PH / 30SM-BL x 30PH, 2) 20SM-BL x 20PH. Axes: flow rate in m3/min (ANR) from 0 to 3.0 against pressure in MPa {kgf/cm2} from 0 to 0.7 {7}. |
Interchangeability and size groups
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 (except models 400, 600, and 800). Please see page 21 for HI CUPLA Series Interchangeability.
Safety and application notes
- Note that fluid will come out from the plug when disconnected, because the valve structure is one-way shut-off.
- 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.
All technical data on this page is taken from the Nitto Kohki general catalogue Quick Connect Couplings C01en-b, page 41. The complete catalogue is available for download on this page.
