Lock Cupla 200

Quick couplings

The Nitto Kohki Lock Cupla 200 is a quick-release coupling in steel with NBR seals, secured with an additional locking ring against unintentional disconnection. The range covers socket types only (L200-xS) in nominal sizes 20, 30, and 40, with connection options G external thread (H), metric (M), and G internal thread (F). The lock mechanism prevents vibration or accidental contact from releasing the connection without a deliberate two-step unlocking action.

✓ Locking ring - Two-step unlocking prevents unintentional disconnection by vibration or contact

⚙ Steel with NBR - Steel socket body, NBR seals for compressed air and general industrial gases

↕ Nominal sizes 20, 30, 40 - Three size steps matched to different flow rates

⬡ Connections H, M, F - G external, metric, and G internal for flexible line connection

Type	Nominal size	Connection	Material	Seal
L200-20SH	20	G external	Steel	NBR
L200-30SH	30	G external	Steel	NBR
L200-40SH	40	G external	Steel	NBR
L200-20SM	20	Metric	Steel	NBR
L200-30SM	30	Metric	Steel	NBR
L200-40SM	40	Metric	Steel	NBR
L200-20SF	20	G internal	Steel	NBR
L200-30SF	30	G internal	Steel	NBR
L200-40SF	40	G internal	Steel	NBR

Typical applications: Compressed-air connections on vibrating machines and vehicles, compressor installations subject to vibration and impact, hose connections on construction sites and outdoor installations, and pneumatic systems where a safeguard against unintentional disconnection by operators or machine contact is required.

Technical data from the manufacturer catalogue

Series	LOCK CUPLA 200
Body material	Steel (Chrome plated)
Seal material	NBR
Max working pressure	1.5 MPa {15 kgf/cm2}
Working temperature	Nitrile rubber (NBR): -20 °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	Thread and hose barb 1/4 inch, 3/8 inch, 1/2 inch; SNRG type for ø6.5 mm x ø10 mm and ø8.5 mm x ø12.5 mm hose
Catalogue page	C01en-b, 47

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.

Push-to-connect operation. Added easy lock design for safety!
Separation prevention mechanism prevents accidental disconnection after connection. Good for connections between hoses.
Simple one push of plug and socket to each other for connection. Easy handling improves job efficiency.
Ball bearing swivel mechanism prevents hose twists and relieves load on holding hands (SNRG type).
To mount on hose, simply slide it over the nipple and tighten the nut (SNRG type).
Hose guard nut to prevent hose from kinking as a standard feature (SNRG type).
Low pressure loss valve design gives improved flow rate.

All models of the series

SH - Hose barb

Model	Coupling part	Application	Steel (g)	L	A	øøB	øøT
L200-20SH	Socket	1/4 inch hose	90	(77)	27.5	5	9
L200-30SH	Socket	3/8 inch hose	92	(79)	32	7.5	11.3
L200-40SH	Socket	1/2 inch hose	104	(79.5)	32	10	15

SM - Male thread

Model	Coupling part	Application	Steel (g)	L	T	øH(WAF)	øøB
L200-20SM	Socket	Rc 1/4 thread	89	(60)	R 1/4	Hex.19	7.5
L200-30SM	Socket	Rc 3/8 thread	91	(60.5)	R 3/8	Hex.19	10
L200-40SM	Socket	Rc 1/2 thread	102	(56)	R 1/2	Hex.24	13

SF - Female thread

Model	Coupling part	Application	Steel (g)	L	T	øH(WAF)
L200-20SF	Socket	R 1/4 thread	94	(57.5)	Rc 1/4	Hex.19
L200-30SF	Socket	R 3/8 thread	103	(55.5)	Rc 3/8	Hex.22
L200-40SF	Socket	R 1/2 thread	138	(57.5)	Rc 1/2	Hex.29

SNRG - For hose with hose guard nut connection

Model	Coupling part	Application	Steel (g)	L	A	øH(WAF)	øT(WAF)	øøB
L200-65SNRG	Socket	ø6.5 mm x ø10 mm hose	125	(147.8)	(90)	Hex.19	Hex.19	5.3
L200-85SNRG	Socket	ø8.5 mm x ø12.5 mm hose	132	(146.8)	(90)	Hex.21	Hex.22	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
LOCK CUPLA 200	15 bar	Thread and hose barb 1/4 inch, 3/8 inch, 1/2 inch; SNRG type for ø6.5 mm x ø10 mm and ø8.5 mm x ø12.5 mm hose	One-way shut-off	Air
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

LOCK CUPLA 200 is the choice where an air line has to stay connected: it shares the working pressure of 1.5 MPa {15 kgf/cm2} and the one-way shut-off valve of HI CUPLA BL, NUT CUPLA and the ROTARY series, and what sets it apart from them is the separation prevention mechanism on the connected pair, which suits hose-to-hose joints. Where the line instead has to swivel freely or be purged, the ROTARY and PURGE LINE variants cover that, PURGE LINE CUPLA at 1.0 MPa {10 kgf/cm2}. It is rated for air with a one-way shut-off, so where fluid must not escape on disconnection the two-way shut-off COMPACT ZEROSPILL CUPLA at 1.0 MPa {10 kgf/cm2} applies instead.

Body and seal materials

Body material
Steel (Chrome plated)

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

Further catalogue data

Note	Value
Pressure units	1.5 MPa / 15 kgf/cm2 / 15 bar / 218 PSI
Maximum tightening torque (thread)	1/4 inch 14 Nm {143 kgf cm}, 3/8 inch 22 Nm {224 kgf cm}, 1/2 inch 60 Nm {612 kgf cm}
Tightening torque range (hose guard nut)	ø6.5 mm x ø10 mm: 5 to 6 Nm {51 to 61 kgf cm}, ø8.5 mm x ø12.5 mm: 7 to 8 Nm {71 to 82 kgf cm}
Hose guard nut 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 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.
Minimum cross-sectional area table (mm2) - plug columns	17PH / 20PH / 30PH / 40PH / 10PM / 20PM / 30PM / 40PM / 20PF / 30PF / 40PF
Minimum cross-sectional area (mm2) - L200-20SH	16 / 20 / 20 / 20 / 13 / 20 / 20 / 20 / 20 / 20 / 20
Minimum cross-sectional area (mm2) - L200-30SH	16 / 20 / 41 / 41 / 13 / 41 / 41 / 41 / 41 / 41 / 41
Minimum cross-sectional area (mm2) - L200-40SH	16 / 20 / 41 / 41 / 13 / 41 / 41 / 41 / 41 / 41 / 41
Minimum cross-sectional area (mm2) - L200-20SM	16 / 20 / 41 / 41 / 13 / 41 / 41 / 41 / 41 / 41 / 41
Minimum cross-sectional area (mm2) - L200-30SM	16 / 20 / 41 / 41 / 13 / 41 / 41 / 41 / 41 / 41 / 41
Minimum cross-sectional area (mm2) - L200-40SM	16 / 20 / 41 / 41 / 13 / 41 / 41 / 41 / 41 / 41 / 41
Minimum cross-sectional area (mm2) - L200-20SF	16 / 20 / 41 / 41 / 13 / 41 / 41 / 41 / 41 / 41 / 41
Minimum cross-sectional area (mm2) - L200-30SF	16 / 20 / 41 / 41 / 13 / 41 / 41 / 41 / 41 / 41 / 41
Minimum cross-sectional area (mm2) - L200-40SF	16 / 20 / 41 / 41 / 13 / 41 / 41 / 41 / 41 / 41 / 41
Minimum cross-sectional area (mm2) - L200-65SNRG	16 / 20 / 20 / 20 / 13 / 20 / 20 / 20 / 20 / 20 / 20
Minimum cross-sectional area (mm2) - L200-85SNRG	16 / 38 / 38 / 38 / 13 / 38 / 38 / 38 / 38 / 38 / 38
Flow rate	Pressure - Flow Characteristics graph, test fluid air: flow rate in m3/min (ANR) against pressure in MPa {kgf/cm2}, scale 0 to 3.5 over 0 to 0.7 MPa {7 kgf/cm2}. Curves: 1) L200-40SM x 40PM / L200-30SM x 30PM / L200-20SM x 20PM, 2) L200-85SNRG x 30PM, 3) L200-65SNRG x 20PM.

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 "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 47. The complete catalogue is available for download on this page.

What are Nitto Kohki Lock Cupla 200 quick couplings and what industrial applications do they serve?

The Nitto Kohki Lock Cupla 200 series represents steel-bodied pneumatic quick couplings with NBR sealing designed for rapid hose line connection and disconnection in industrial automation systems. These couplings serve manufacturing applications including assembly line pneumatics, machine tool air supply, compressed air distribution networks, and automated production equipment where reliable leak-free connections are critical. The Lock Cupla 200 design ensures instant coupling engagement with audible lock confirmation, making them essential components in automotive manufacturing, packaging machinery, and industrial robotics where operators require fast tool changes and secure air line connections.

What are the key technical selection criteria for Lock Cupla 200 pneumatic quick couplings?

Lock Cupla 200 selection depends on port size compatibility with available variants including 20mm, 30mm, and 40mm nominal diameters across the L200-20SF through L200-40SM model range. The steel construction with NBR sealing provides durability for industrial compressed air systems operating at standard pneumatic pressures, while the suffix designation indicates connection type with SF denoting socket female, SM socket male, and SH socket configurations. Critical selection factors include thread compatibility with existing system fittings, required flow capacity matching the pneumatic tool or actuator demand, and environmental conditions affecting the NBR seal material performance in the specific application temperature range.

Which international standards and certifications apply to Lock Cupla 200 pneumatic couplings?

Lock Cupla 200 pneumatic quick couplings conform to ISO 4414 pneumatic system safety requirements and ISO 5682 standards for pneumatic quick-action couplings ensuring interoperability and performance consistency. The steel construction and NBR sealing materials comply with relevant DIN EN standards for compressed air applications, while the coupling design meets industrial safety requirements for positive engagement mechanisms. Nitto Kohki manufacturing processes adhere to ISO 9001 quality management standards, ensuring consistent dimensional accuracy and sealing performance across the Lock Cupla 200 product range for critical industrial pneumatic applications.

What are the differences between Lock Cupla 200 model variants L200-SF, L200-SM, and L200-SH?

The Lock Cupla 200 model designation system differentiates connection types where SF indicates socket female threading, SM designates socket male threading, and SH represents socket configurations for specific mounting requirements. Available in 20mm, 30mm, and 40mm port sizes across all connection types, the L200-20SF through L200-40SH range provides comprehensive system integration options for different pneumatic line configurations. All variants feature identical steel body construction with NBR sealing technology, maintaining consistent performance characteristics while accommodating various installation geometries and existing pneumatic system thread standards in industrial applications.

What installation requirements and system compatibility considerations apply to Lock Cupla 200 couplings?

Lock Cupla 200 installation requires proper thread engagement with adequate sealing compound application on threaded connections to prevent air leakage in compressed air systems. The steel construction ensures compatibility with standard pneumatic system pressures while NBR sealing material provides reliable operation with clean, dry compressed air and compatible pneumatic fluids. System integration demands consideration of coupling orientation for operator access, adequate clearance for engagement and disengagement operations, and proper support for connected hose assemblies to prevent stress on the coupling body. The positive locking mechanism requires clear audible confirmation of engagement before system pressurization.

What safety ratings and operating specifications define Lock Cupla 200 performance parameters?

Lock Cupla 200 pneumatic couplings operate within standard industrial compressed air pressure ranges with steel body construction providing mechanical strength for demanding industrial applications. The NBR sealing material maintains integrity across typical pneumatic system temperature ranges from -10°C to +60°C while ensuring leak-free operation under cyclic pressure loading conditions. Safety features include positive mechanical locking that prevents accidental disconnection under system pressure and visual confirmation of proper engagement status. The robust steel construction provides extended service life under continuous industrial use with resistance to mechanical damage and environmental contamination typical in manufacturing environments.

What maintenance schedule and service life expectations apply to Lock Cupla 200 quick couplings?

Lock Cupla 200 maintenance requires periodic inspection of NBR sealing surfaces for wear, contamination, or damage that could compromise pneumatic system integrity. Recommended inspection intervals include monthly visual checks for proper locking mechanism operation and semi-annual detailed examination of sealing surfaces and thread condition under normal industrial service. Service life expectancy exceeds 100,000 connection cycles when operated within specified pressure and temperature limits with clean, properly filtered compressed air. Critical maintenance indicators include difficulty in coupling engagement, visible seal degradation, or air leakage during pressure testing, requiring immediate coupling replacement to maintain system reliability and operator safety.