Line Cupla

Low pressure up to 19 bar

The Nitto Kohki Line Cupla is an in-line quick coupling for low-pressure service up to 19 bar, installed directly in the line run without separate plug or socket end-fittings. The range covers three items in the LineCupla 200 series: T-form (LineCupla200-T), L-form (Linecupla200-L) and straight (Linecupla200-S). The body is aluminium and steel with an NBR seal.

⚙ Aluminium/steel body with NBR - lightweight construction for in-line installation in compressed-air lines

✓ Three installation forms - T-shape (200-T), L-shape (200-L), straight (200-S)

⚡ Working pressure up to 19 bar - rated for general low-pressure pneumatic applications

↕ In-line design - integrates directly in the pipe run without additional end connections

Part number	Form	Body material	Seal
LineCupla200-T	T-shape	Aluminium / Steel	NBR
Linecupla200-L	L-shape (90°)	Aluminium / Steel	NBR
Linecupla200-S	Straight	Aluminium / Steel	NBR

Typical applications: Compressed-air lines in production and workshop environments where quick couplings are to be installed in-line in a space-saving manner, T-branch connections and direction changes in pneumatic installations up to 19 bar, and systems where conventional plug/socket couplings at the hose end are impractical.

Technical data from the manufacturer catalogue

Series	LINE CUPLA 200
Body material	Body: Aluminum alloy, CUPLA: Steel (chrome plated)
Seal material	NBR (Nitrile rubber)
Max working pressure	1.5 MPa {15 kgf/cm2}
Working temperature	NBR (Nitrile rubber): -20 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.
Catalogue page	C01en-b, 57

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.

Simple design air line coupling on manifold.
Enables several air lines to be taken simultaneously from one supply line.
Just push in the plug into socket for simple and secure connection.
Multiple outlets are available from single air supply source.
Choose from the 2-outlet type (Model 200T), the 5-outlet straight type (Model 200L) and the 5-outlet star type (Model 200S) to suit your application.
The products come with dustproof caps.

All models of the series

200T - Manifold for two outlets, inlet 20PM, outlets 200-20SM (2 pcs.)

Model	Coupling part	Application	Total (g)
200T	Socket	For two outlets	272

200L - Manifold for five outlets, in-line type, inlet 400PM, outlets 200-20SM (4 pcs.) and 200-40SM (1 pc.)

Model	Coupling part	Application	Total (g)
200L	Socket	For five outlets, in-line type	890

200S - Manifold for five outlets, star type, inlet 400PM, outlets 200-20SM (4 pcs.) and 200-40SM (1 pc.)

Model	Coupling part	Application	Total (g)
200S	Socket	For five outlets, star type	769

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 CUPLA	10 bar	Thread 1/8 inch; tube barb for ø4 x ø6 and ø6 x ø8 tube	Two-way shut-off	Air, Water
CUBE CUPLA	10 bar	4 mm and 6 mm ID tube, 1/8 inch	Two-way shut-off, one-way shut-off or straight through, depending on the combination of valved and valveless socket and plug.	Air, Water
FULL BLOW CUPLA	15 bar	Thread and hose barb 1/4 inch, 3/8 inch, 1/2 inch. SN type for urethane hose: for dia. 6.5 mm x dia. 10 mm, dia. 8 mm x dia. 12 mm, dia. 8.5 mm x dia. 12.5 mm and dia. 11 mm x dia. 16 mm polyurethane hose.	One-way shut-off	Air
HI CUPLA 200	15 bar	Thread and hose barb 1/4 inch, 3/8 inch, 1/2 inch. Tube barb (Tube fitter): Polyurethane tube outer dia. 6 +/-0.1, 8 +/-0.15, 10 +/-0.15; Polyamide tube outer dia. 6 +0.05/-0.08, 8 +0.05/-0.1, 10 +0.05/-0.1; Fluorine contained resin tube outer dia. 6 +/-0.07, 8 +/-0.07, 10 +/-0.07.	One-way shut-off	Air
HI CUPLA ACE	15 bar	Thread and hose barb 1/4 inch, 3/8 inch; PN, SN, PNG and SNG types for ø5 mm x ø8 mm, ø6 mm x ø9 mm, ø6.5 mm x ø10 mm, ø8 mm x ø12 mm and ø8.5 mm x ø12.5 mm polyurethane hose	One-way shut-off	Air, Water
HI CUPLA	15 bar	Thread and hose barb 1/8 inch to 1 inch, 1/4 inch to 1 inch hose	One-way shut-off	Air, Water
LINE CUPLA 200	15 bar	-	One-way shut-off	Air
LEVER LOCK CUPLA	18 bar	Metal body: 3/4 inch to 4 inch. Plastic body: 3/4 inch, 1 inch, 1 1/2 inch, 2 inch, 3 inch.	Straight through	Water, Hydraulic oil, Air, Powder, Steam

Choose LINE CUPLA 200 when two or five air lines have to be taken from one supply line at the same point, at a working pressure of up to 1.5 MPa {15 kgf/cm2}. MICRO CUPLA, SMALL CUPLA, COMPACT CUPLA, CUBE CUPLA and SUPER CUPLA are rated 1.0 MPa {10 kgf/cm2} and are therefore limited to lower pressure lines. Its couplings are one-way shut-off; where both sides of the line must close on disconnection, COMPACT CUPLA and CUBE CUPLA offer two-way shut-off, while LEVER LOCK CUPLA is straight through with no shut-off valve.

Body and seal materials

Body material
Body: Aluminum alloy
CUPLA: Steel (chrome plated)

Seal material	Mark	Working temperature	Remarks
NBR (Nitrile rubber)	-	-20 to +60 deg C	-

Further catalogue data

Note	Value
Inlet	200T Type: 20PM. 200L Type / 200S Type: 400PM
Outlet	200T Type: 200-20SM. 200L Type / 200S Type: 200-20SM, 200-40SM
Working pressure (all units)	1.5 MPa, 15 kgf/cm2, 15 bar, 218 PSI
Minimum cross-sectional area	19 mm2 (200T type, 200L type, 200S type)
Flow direction	Fluid must run from the inlet port to the outlet ports.
Accessory	400SH (supplied with the 200L type and the 200S type)
Seal material remark	NBR is the standard material.
Note on dimensions	The 200T, 200L and 200S dimension drawings on page 59 carry unlabelled dimension figures only, so no named dimensions are recorded for the model rows; the printed masses are given.
Flow rate	Pressure - Flow Characteristics graph on page 58, test fluid air, pressure 0 to 0.7 MPa {7 kgf/cm2} and flow rate 0 to 8.0 m3/min (ANR), plotted for 200L and 200S with 1 to 5 pieces of 30PH and for 200T with 1 to 2 pieces of 30PH.

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. 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.

All technical data on this page is taken from the Nitto Kohki general catalogue Quick Connect Couplings C01en-b, page 57. The complete catalogue is available for download on this page.

What are Nitto Kohki Line Cupla quick disconnect couplings and which industries use them?

Nitto Kohki Line Cupla quick disconnect couplings are low-pressure pneumatic and hydraulic connectors designed for operating pressures up to 19 bar with aluminum and steel construction featuring NBR sealing elements. These couplings serve manufacturing industries requiring frequent connection and disconnection of pneumatic tools, automated assembly lines, packaging equipment, and light hydraulic applications. The Line Cupla series enables rapid system reconfiguration without tools while maintaining secure pressure sealing through precision-machined coupling mechanisms. Primary applications include automotive assembly, food processing equipment, pharmaceutical manufacturing, and general industrial automation where reliable quick-connect functionality is essential for operational efficiency.

What technical specifications should engineers consider when selecting Line Cupla couplings?

Engineers must evaluate operating pressure requirements up to 19 bar maximum, media compatibility with compressed air and compatible hydraulic fluids, and connection port configurations available in the LineCupla200 series including L-type, S-type, and T-type variants. The aluminum and steel construction with NBR sealing provides chemical resistance for standard industrial media while ensuring mechanical durability under repeated connect-disconnect cycles. Flow capacity, pressure drop characteristics, and coupling retention force must match application demands, particularly in automated systems where coupling integrity affects production reliability. Temperature operating range and seal material compatibility determine suitability for specific process environments and fluid types encountered in pneumatic and hydraulic circuits.

Which ISO and DIN standards apply to Nitto Kohki Line Cupla quick disconnect couplings?

Nitto Kohki Line Cupla couplings comply with ISO 4414 pneumatic system safety standards and ISO 7241 hydraulic quick-action couplings specifications for pressure ratings and performance requirements. DIN 3489 governs quick-acting coupling dimensions and connection standards for European industrial applications, ensuring interchangeability with other compliant coupling systems. The NBR sealing materials meet DIN 53504 elastomer specifications for chemical resistance and temperature stability in industrial fluid applications. Manufacturing quality follows ISO 9001 certification requirements, while pressure testing procedures align with EN 982 safety standards for pneumatic components operating at pressures up to 19 bar in industrial environments.

What are the differences between LineCupla200-L, LineCupla200-S, and LineCupla200-T coupling variants?

The LineCupla200-L variant features a locking mechanism design optimized for permanent installations requiring secure connection retention under vibration and pressure fluctuations. LineCupla200-S incorporates a standard quick-disconnect configuration for general-purpose applications with balanced ease of connection and retention strength suitable for manual operation. The LineCupla200-T variant provides a twist-lock coupling mechanism that combines rapid connection with enhanced security through rotational locking action, ideal for applications requiring both speed and positive retention confirmation. All three variants utilize identical aluminum and steel construction with NBR seals, maintaining 19 bar pressure rating while offering different engagement and retention characteristics to match specific application requirements.

What installation requirements and system compatibility factors apply to Line Cupla couplings?

Line Cupla installations require clean, burr-free pipe ends with proper thread preparation according to DIN 3852 or equivalent threading standards to ensure leak-tight connections and proper coupling alignment. System compatibility depends on media cleanliness levels, with filtration recommended to ISO 8573 Class 7 or better to prevent contamination damage to NBR seals and coupling mechanisms. Operating pressure must remain within the 19 bar maximum rating with appropriate system pressure regulation and relief valve protection to prevent overpressure conditions. Connection orientation and accessibility for manual coupling operation must accommodate the specific engagement mechanism of L-type, S-type, or T-type variants while maintaining proper support for connected pneumatic or hydraulic lines.

What safety ratings and environmental operating limits apply to Nitto Kohki Line Cupla couplings?

Nitto Kohki Line Cupla couplings operate safely at pressures up to 19 bar with NBR seals providing temperature stability from -20°C to +80°C in standard industrial environments without degradation of sealing performance. The aluminum and steel construction meets mechanical strength requirements for industrial pneumatic applications with appropriate safety factors according to ISO 4414 pressure vessel standards. Environmental protection varies by installation configuration, with proper housing achieving IP54 ingress protection against dust and water spray when correctly installed with appropriate cable glands and sealing. Safety factor calculations must account for pressure spikes, temperature variations, and cyclic loading conditions typical in automated pneumatic systems to ensure reliable operation throughout the coupling service life.

What maintenance schedule and service life expectations apply to Line Cupla quick disconnect couplings?

Line Cupla couplings require visual inspection every 500 operating cycles or quarterly for seal integrity, coupling mechanism wear, and connection security according to ISO 4414 maintenance guidelines for pneumatic components. NBR seal replacement typically occurs every 50,000 cycles or annually depending on operating pressure, temperature cycling, and media contamination levels encountered in service. Coupling mechanism lubrication with compatible pneumatic oil every 1,000 cycles maintains smooth operation and extends service life beyond 100,000 connect-disconnect cycles under normal industrial conditions. Complete coupling replacement becomes necessary when visual inspection reveals seal degradation, mechanical wear affecting retention force, or pressure testing indicates leakage exceeding 1% of system pressure per ISO 7241 acceptance criteria for hydraulic quick-action couplings.