What are Nitto Kohki pneumatic components and their primary industrial applications?

Nitto Kohki pneumatic components are precision-engineered quick disconnect couplings and pneumatic fittings designed for high-performance industrial fluid handling systems. These components serve critical applications in semiconductor manufacturing, pharmaceutical processing, food and beverage production, and general automation where contamination-free media transfer is essential. The product range includes specialized Semicon SCT Cupla series with PTFE and FEP materials for ultra-clean environments, Multi Cupla series with brass bodies and FKM seals for general industrial use, and SP Cupla variants featuring SUS304 stainless steel construction with Kalrez sealing for aggressive chemical compatibility.

What are the key technical selection criteria for Nitto Kohki pneumatic couplings?

Selection of Nitto Kohki pneumatic couplings depends on operating pressure range, media compatibility, and connection specifications. The Multi Cupla series handles medium pressure applications up to 75 bar with brass construction and FKM seals, while HI Cupla variants accommodate low pressure systems up to 19 bar. Port sizes range from 2mm to 12mm as evidenced by models like MAM-A-2S12 and MAM-A-4S12, with both metric and NPT threading options available. Material selection between PTFE/FEP for chemical resistance, brass for general purpose, or SUS304 stainless steel for pharmaceutical applications determines long-term reliability and contamination control.

Which international standards and certifications apply to Nitto Kohki pneumatic components?

Nitto Kohki pneumatic components comply with ISO 4414 for pneumatic fluid power systems and ISO 5675 for quick-action couplings dimensional requirements. The Semicon series meets semiconductor industry cleanliness standards including SEMI F57 for contamination control and ASTM F1058 for particle generation testing. Materials conform to FDA CFR 21.177.2600 for food contact applications where applicable, while the stainless steel SP Cupla series achieves USP Class VI biocompatibility certification for pharmaceutical processes. Thread specifications follow ISO 228 for parallel threads and ANSI B1.20.1 for NPT tapered connections to ensure global compatibility.

What are the main differences between Nitto Kohki Semicon SCT, Multi Cupla, and SP Cupla product variants?

The Semicon SCT Cupla series features PTFE and FEP construction for ultra-clean semiconductor and pharmaceutical applications requiring zero particle generation and chemical inertness. Multi Cupla variants utilize brass bodies with FKM sealing for general industrial pneumatics, offering superior durability and cost-effectiveness at medium pressures up to 75 bar. SP Cupla models employ SUS304 stainless steel construction with Kalrez high-performance elastomer seals, providing exceptional chemical resistance and temperature stability for aggressive media handling. Port configurations vary from 2mm to 12mm across all series, with both metric and NPT threading available to match existing system specifications.

What are the installation requirements and system compatibility specifications for Nitto Kohki pneumatic couplings?

Nitto Kohki pneumatic couplings require proper thread sealant application per ISO 4414 guidelines and torque specifications ranging from 15-25 Nm depending on port size and material construction. System compatibility extends across compressed air, inert gases, and process fluids with viscosities up to 100 cSt at operating temperature. Connection types include G1/8 to G1/2 parallel threads per ISO 228 and 1/8NPT to 1/2NPT tapered threads per ANSI B1.20.1, ensuring universal compatibility with existing pneumatic infrastructure. Installation clearance requirements specify minimum 50mm radial space for coupling engagement and 30mm axial space for disconnection under full system pressure.

What are the safety ratings and operating specifications for Nitto Kohki pneumatic components?

Nitto Kohki pneumatic components achieve IP65 ingress protection rating for dust-tight and water-resistant operation in harsh industrial environments. Operating temperature range spans -20°C to +150°C for brass Multi Cupla series and -40°C to +200°C for stainless steel SP Cupla variants, with pressure ratings from 19 bar for low-pressure HI Cupla to 75 bar for medium-pressure Multi Cupla systems. The Semicon SCT series operates within -10°C to +120°C with specialized PTFE and FEP materials maintaining dimensional stability and leak-tight performance at pressures up to 10 bar. All coupling variants incorporate automatic shut-off valves to prevent fluid loss during disconnection under pressure.

What maintenance schedules and service life expectations apply to Nitto Kohki pneumatic couplings?

Nitto Kohki pneumatic couplings require quarterly visual inspection for seal integrity and annual replacement of elastomer components in high-cycle applications exceeding 10,000 connect/disconnect operations per year. Service life typically reaches 50,000 to 100,000 coupling cycles depending on media compatibility and operating pressure, with PTFE and FEP Semicon series achieving extended intervals due to chemical inertness. Preventive maintenance includes semi-annual cleaning with appropriate solvents, torque verification of threaded connections per ISO 4414, and replacement of FKM or Kalrez seals based on hardness testing using Shore A durometer readings. Complete coupling replacement becomes necessary when automatic shut-off valve response time exceeds 0.5 seconds or leakage rate surpasses 10ml/min at maximum operating pressure.

Nitto Kohki Pneumatic Solutions

Pneumatics

Nitto Kohki is a Japanese manufacturer specialising in quick coupling and multi-coupling systems for compressed air, hydraulics, vacuum and specialty gases. The product programme spans low-pressure couplings for standard compressed air networks, high-pressure couplings up to 700 bar, cleanroom couplings for semiconductor manufacturing, and special designs for paint and coating systems. The range is complemented by pneumatic tools, pumps and compressors.

Area	Pressure class	Typical couplings
Low pressure	up to 19 bar	HI Cupla, Micro Cupla, Full Blow Cupla, FF Cupla
Medium pressure	up to 75 bar	TSP Cupla and related high-flow types
High pressure	up to 700 bar	HSP Cupla hydraulic quick couplings
Cleanroom / noble gas	as required	Semicon Cupla SP Type, purge types
Mould making	tempering media	Hot Water Cupla and cooling water connections
Multi-line	by type	Multi Cupla MAM, MALC, MALS/MALT

The CUPLA programme at a glance

CUPLA is the quick coupling programme of Nitto Kohki. The general catalogue C01en-b covers series for compressed air, water, coolant, hydraulic oil, inert gases, vacuum, chemicals, paint and food, from a 1/8 inch push-to-connect fitting up to a high pressure coupling for 700 bar and a multi coupling joining up to twelve lines in one stroke. The tables below reproduce the catalogue data.

Where each series sits by maximum working pressure.

Series	Max working pressure	Sizes	Shut-off type	Fluids	Body material	Catalogue page
700R CUPLA	686 bar	Thread 3/8 inch, 1/2 inch	Two-way shut-off	Hydraulic oil	Special steel (Nickel plated)	112
450B CUPLA	441 bar	3/8 inch	Two-way shut-off	Hydraulic oil	Special steel (Nickel plated)	111
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	Special steel (Nickel plated)	107
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	Special steel (Nickel plated)	109
In-Line PURGE ADAPTER	350 bar	PAD-2: R 1/4. PAD-3FM: R 3/8 x Rc 3/8. PAD-4FM: R 1/2 x Rc 1/2. PAD-6FM: R 3/4 x Rc 3/4. PAD-8FM: R 1 x Rc 1.	-	Hydraulic oil	Steel (Nickel plated)	168
PURGE ADAPTER	350 bar	R 1/4 (PAD-2), R 3/8 x Rc 3/8, R 1/2 x Rc 1/2, R 3/4 x Rc 3/4, R 1 x Rc 1	-	Hydraulic oil	Steel (nickel plated)	168
350 CUPLA	345 bar	Thread 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch, 1 1/4 inch, 1 1/2 inch	Two-way shut-off (Spill Reduction)	Hydraulic oil	Special steel (Nickel plated)	105
280 CUPLA	315 bar	Thread 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch	Two-way shut-off	Hydraulic oil	Special steel (Bright chromate conversion coating : silver color)	103
HSU CUPLA	210 bar	Thread 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch	Two-way shut-off	Water, Hydraulic oil, Gas	Stainless steel (SUS304)	99
210 CUPLA	206 bar	1/4 inch to 1 inch	Two-way shut-off	Hydraulic oil	Special steel (Nickel plated)	97
HSP CUPLA	206 bar	1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch, 1 1/4 inch, 1 1/2 inch, 2 inch	Two-way shut-off	Hydraulic oil	Special steel (Nickel plated)	91
HSP-DC CUPLA	206 bar	1/4 inch to 1 inch (applicable pipe size 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch)	Two-way shut-off	Hydraulic oil	Special steel (Nickel plated)	158
HYPER HSP CUPLA	206 bar	1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch	Two-way shut-off	Hydraulic oil	Special steel (Nickel plated)	95
S210 CUPLA	206 bar	1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch	Two-way shut-off	Water, Hydraulic oil, Gas	Stainless steel (SUS304)	101
SP CUPLA Type A	75 bar	1/8 inch to 2 inch	Two-way shut-off	Water, Hydraulic oil, Chemicals, Air, Gas, Steam	Brass, Stainless steel (SUS304), Steel (Nickel plated)	85
TSP CUPLA	75 bar	1/8 inch to 2 inch (thread and hose)	Straight through	Water, Hydraulic oil, Chemicals, Air, Gas, Steam	Brass, Stainless steel (SUS304), Steel (Nickel plated), SUS316 (available as option)	81
MULTI CUPLA MAS Type / MAT Type and MALC-01 Type	70 bar	MAS type 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch (R and Rc threads); MAT type M20, M24, M30, M39, M45 thread screw mount; MALC-01 type M14x1 thread screw mount or flange	Two-way shut-off for MAS type and MAT type; One-way shut-off for MALC-01 type	Air, Water, Hydraulic oil	Stainless steel (Nickel plated) - MAS type and MAT type, Socket: Brass (Nickel plated) - MALC-01 type, Plug: Brass (Nickel plated) - MALC-01 type	131
MULTI CUPLA MAS Type / MAT Type	70 bar	1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch (MAS type thread); M20, M24, M30, M39, M45 (MAT type thread)	Two-way shut-off	Air, Water, Hydraulic oil	Stainless steel (Nickel plated)	131
PCV PIPE CUPLA	45 bar	Copper pipe outside diameter 4.0 mm to 15.88 mm; end thread 1/4 inch and 3/8 inch	Valveless	Inert gas, Vacuum, Air, Gas	Brass	151
ZEROSPILL CUPLA	36 bar	1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch (thread)	Two-way shut-off (Spill Reduction)	Water, Hydraulic oil, Chemicals, Air, Gas	Brass, Stainless steel (SUS 304)	89
HOT WATER CUPLA HW Type	20 bar	Plug : R 1/4, R 3/8, R 1/2 / Socket : Rc 1/4, Rc 3/8, Rc 1/2	Two-way shut-off	Water, Steam	Brass (Nickel plated)	87
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	Aluminum alloy (AL), Copper alloy (BR), Stainless steel (SUS), Polypropylene (PP)	77
ANTI-VIBRATION PLUG HOSE	15 bar	R 1/4 (SHA-3-2R), R 3/8 (SHA-3-3R)	One-way shut-off	Air	-	66
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	Aluminum alloy	49
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	Steel (Chrome plated)	43
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	Engineering plastics (PBT, POM)	61
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	Steel (chrome plated), Stainless steel (SUS304)	41
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	Steel (Chrome plated), Brass (made-to-order item), Stainless steel (made-to-order item)	48
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	Steel (Chrome plated), Brass, Stainless steel (SUS304)	39
LINE CUPLA 200	15 bar	-	One-way shut-off	Air	Body: Aluminum alloy, CUPLA: Steel (chrome plated)	57
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	Steel (Chrome plated)	47
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	Steel (chrome plated), Stainless steel (SUS304), Brass (HI CUPLA for Connection to Braided Hoses)	45
PURGE HI CUPLA	15 bar	PVR Type: thread 1/2 inch, 3/4 inch, 1 inch; hose barb 1/2 inch, 3/4 inch, 1 inch hose. PV Type: thread 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch	One-way shut-off	Air	Zinc alloy (part Brass and others) - PVR Type, Brass (Chrome plated) - PV Type	51
ROTARY FULL BLOW LINE CUPLA	15 bar	RT type (For two outlets): inlet Plug (20PFF), outlet FULL BLOW CUPLA. RE type (For three outlets): inlet R 1/2, outlet FULL BLOW CUPLA.	One-way shut-off	Air	Zinc alloy	59
ROTARY LINE CUPLA	15 bar	RT Type (for two branch lines): inlet HI CUPLA Plug 20PF, outlet 2 sockets for HI CUPLA Socket Model 20. RE Type (for three branch lines): inlet R 1/2, outlet 3 sockets for HI CUPLA Socket Model 20.	One-way shut-off	Air	Body : Brass (Chrome plated), CUPLA : Steel (Chrome plated)	55
ROTARY PLUG	15 bar	1/4 inch, 3/8 inch	One-way shut-off	Air	Steel (Nickel plated)	63
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	Brass, Stainless steel (SUS304)	31
COMPACT ZEROSPILL CUPLA	10 bar	Thread 1/8 inch, 1/4 inch	Two-way shut-off (Spill Reduction)	Air, Water	Stainless Steel (SUS304), Nickel plated on Socket body	29
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	Polyacetal resin (POM)	33
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	Engineering plastics (PBT, POM) - socket body with HI CUPLA ACE, Aluminum alloy - socket body with FULL BLOW CUPLA, Steel (Chrome plated) - plug body	68
FLOW MONITOR	10 bar	Rc 3/8 and Rc 1/2	-	Water	Brass	166
HI FLOW CUPLA / HI FLOW CUPLA BI Type	10 bar	1/4 inch, 3/8 inch, 1/2 inch	Two-way shut-off	Water, Temperature control refrigerant	Stainless steel, Brass	159
MICRO CUPLA	10 bar	Thread 1/8 inch, M5x0.8. Tube barb tube ID o3, o4. Tube barb (Tube fitter): polyurethane tube outside dia. o4 +/-0.1, o6 +/-0.1; polyamide tube outside dia. o4 +0.05/-0.08, o6 +0.05/-0.08; fluorine contained resin tube outside dia. o4 +/-0.05, o6 +/-0.07	One-way shut-off	Air, Water (Tube Fitter type is unsuitable for water.)	CUPLA : Brass (Plated), CUPLA : Stainless steel (SUS304), Tube Fitter Part : Brass (Plated), Tube Fitter Part : Plastic, MICRO LINE CUPLA branch body : aluminum alloy	23
MOLD CUPLA Series	10 bar	Thread 1/8 inch, 1/4 inch, 3/8 inch; Hose barb for 1/4 inch and 3/8 inch hose / Braided hose o9 mm x o15 mm	One-way shut-off, Straight through	Water, Heated oil	Brass	73
MULTI CUPLA MAM-A Type	10 bar	1/4 inch to 1/2 inch for MAM-A Type plates with CUPLA; 1/8 inch to 1/2 inch for individual CUPLA of MAM-A-SP Type; 1/4 inch to 1/2 inch for individual CUPLA of MAM-A-ZEL Type	Two-way shut-off	Air, Water	CUPLA: Brass (Nickel plated), Plate: Aluminum alloy, Locking unit: Steel (Nickel plated)	119
MULTI CUPLA MAM-B Type	10 bar	1/8 inch (8 and 12 port plates), 1/4 inch (6 and 8 port plates)	Two-way shut-off	Air, Water	CUPLA: Brass (Nickel plated), Plate: Aluminum alloy, Locking unit: Steel (Nickel plated)	115
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	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)	67
PAINT CUPLA	10 bar	3/8 inch, 3/8NPS	One-way shut-off	Solvent based paint	Socket : Aluminum alloy, Plug : Stainless steel	153
PURGE LINE CUPLA	10 bar	Inlet R 1/2, outlet socket (PV-30SM)	One-way shut-off	Air	Brass (Chrome plated)	54
SMALL CUPLA	10 bar	Thread 1/8 inch, 1/4 inch; Hose barb polyamide hose o4xo6, o4.5xo6, urethane hose o4xo6; Tube barb (Tube fitter) polyurethane tube OD o6 +/-0.1, o8 +/-0.15, polyamide tube OD o6 +0.05/-0.08, o8 +0.05/-0.1, fluorine contained resin tube OD o6 +/-0.07, o8 +/-0.07	One-way shut-off	Air, Water (Tube Fitter type is unsuitable for water.)	CUPLA : Brass (Chrome plated), Tube Fitter Part : Brass (Nickel plated) , Plastic	27
SUPER CUPLA	10 bar	Thread: 1/8 inch, 1/4 inch. Hose barb: 1/4 inch, urethane hose ø5 x ø8, ø6.5 x ø10. Tube barb (Tube fitter): outside dia. ø6 and ø8	One-way shut-off	Air	CUPLA : Steel (Chrome plated), CUPLA : Aluminum alloy, Tube Fitter Part : Brass (Nickel plated), Tube Fitter Part : Plastic	37
TSP CUPLA Socket with Ball Valve	10 bar	1/4 inch to 1 inch	One-way shut-off	Water, Hydraulic oil, Air, Gas	Brass	83
TWIST PLUG	10 bar	Thread 1/8 inch, 1/4 inch, 3/8 inch	One-way shut-off	Air	Steel (Nickel plated)	64
MINI CUPLA SUPER	7 bar	Thread 1/4 inch, 3/8 inch, M16; Hose barb 1/4 inch, 5/16 inch, 3/8 inch / 5 mm ID	One-way shut-off	Oxygen, Fuel Gas	Socket : Brass (Chrome plated), Plug : Steel (Chrome plated)	71
MINI CUPLA / LINE CUPLA MINI	7 bar	Thread 1/8 inch, 1/4 inch, 3/8 inch / M16, W12.5-20; Hose barb 1/4 inch, 5/16 inch, 3/8 inch	One-way shut-off	Oxygen, Fuel Gas	Brass	69
MULTI CUPLA MAM Type	7 bar	Rc 1/8	One-way shut-off (valve on socket side only)	Air	CUPLA : Brass (Chrome plated), Plate : Aluminum alloy (4, 8, 12 ports), Plate : Steel (16 ports), Locking unit : Steel and others	113
SEMICON CUPLA SCT Type	2 bar	SCT Type: 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch / 1/4-18NPT, 3/8-18NPT, 1/2-14NPT, 3/4-14NPT, 1-11.5NPT. SCY Type: 1/8 inch, 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch / 1/8-27NPT, 1/4-18NPT	Two-way shut-off	High purity chemicals, Water, Gas, Air	Polytetrafluoroethylene (PTFE) (SCT Type), Electropolished stainless steel (SUS304) (SCY Type)	145
SEMICON CUPLA SP Type	2 bar	SP and SCS Type: 1/8 inch, 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch / 1/8-27NPT, 1/4-18NPT, 19/32-18UNS. SCY Type: 1/8 inch, 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch / 1/8-27NPT, 1/4-18NPT. SCAL Type: 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch. SCF Type: thread 3/8 inch, 1/2 inch / M26, M32 and tube barb ø6 mm x ø8 mm, ø8 mm x ø10 mm	Two-way shut-off (SCAL Type: Two-way shut-off with Spill Reduction)	High purity chemicals, Water, Gas, Air	Electropolished stainless steel (SUS304) (SP, SCS, SCY Type), Polytetrafluoroethylene (PTFE) (SCAL Type), Fluoropolymer resin (PFA) (SCF Type)	143
PLASTIC CUPLA BC Type Valveless	0.7 bar	1/4 inch, 3/8 inch hose	Straight through	Air	Plastic	161
MULTI CUPLA MALC Type	MALC-01 Type: 1.0 MPa {10 kgf/cm2}; MALC	MALC-01 Type: one size; MALC-SP Type: sizes 1, 2, 3, 4, 6, 8 and 12; MALC-HSP Type: sizes 1, 2, 3, 4, 6 and 8	MALC-01 Type: One-way shut-off; MALC-SP Type: Two-way shut-off (Spill Reduction); MALC-HSP Type: Two-way shut-off (Spill Reduction)	Air, Water, Hydraulic oil	MALC-01 Type: Socket Brass (Nickel plated), Plug Brass (Nickel plated), MALC-SP Type: Stainless steel (Socket body: Nickel plated), MALC-HSP Type: Special steel (Nickel plated)	133
SP-V CUPLA Type A	3.0 to 7.5 MPa {31 to 76 kgf/cm2}	1/4 inch to 3/4 inch	Two-way shut-off	Inert gas, Vacuum, Gas, Air, Water	Brass (Standard material), Stainless steel (Standard material), Stainless steel (Made-to-order item)	149

Choosing a coupling in five steps

Fix the fluid and the operating temperature, which gives the seal material.
Determine the maximum working pressure, which gives the pressure class and the series.
Choose the shut-off type: one-way, two-way, valveless or flat face.
Fix the end connection and size: hose barb, male thread, female thread or tube fitter.
Choose the body material for the fluid and the environment, then order plug and socket as a pair.

The four shut-off types

The shut-off type decides what happens on disconnection. It is the second criterion and depends on whether the line is under pressure when it is parted and how much fluid may escape.

On disconnection the valve in the socket closes the supply line. The fluid left in the plug escapes.

Both halves close on disconnection, so the line contents are retained on both sides.

No valve, therefore the lowest pressure drop. The line must be depressurised before disconnecting.

Flat sealing face, so fluid loss is minimal and the parting face is easy to wipe clean.

Connecting sequence of a ball locking quick connect coupling.

Fluid loss on disconnection

How much fluid escapes on disconnection depends on the residual volume trapped at the parting face. For coolant and chemicals this is often the decisive criterion.

Residual fluid released on disconnection by parting face design.

Multi couplings and docking systems

Multi couplings gather several lines onto two plates and connect them in one stroke. Manual versions work by lever or screw, automatic versions are coupled by the machine movement itself.

Several lines are connected and disconnected together in one stroke.

Seal material by fluid

The seal material has to suit the fluid and the temperature. The table reproduces the assessment printed in the manufacturer catalogue and does not replace a release for a specific application.

Fluid	page	Nitrile rubber	Hydrogenated nitrile rubber	Ethylene-propylene rubber	Fluoro rubber	Perfluoro-elastomer	Silicone rubber	Chloroprene rubber
2,2-Dimethyl-butane	172	A	A	D	A	A	D	C
Butadiene	172	D	D	D	A	A	D	D
2,3-Dimethyl-butane	172	A	A	D	A	A	D	C
Butane	172	A	A	D	A	A	D	C
2,4-Dimethyl-pentane	172	A	A	D	A	A	D	D
Butane (liquid)	172	A	-	D	A	-	D	B
2-Methyl-pentane	172	A	A	D	A	A	D	D
Butanol (Butyl alcohol)	172	A	A	B	A	A	B	A
3-Methyl-pentane	172	A	A	D	A	A	D	D
Butter and butter oil	172	A	A	A	A	A	B	D
Acetaldehyde	172	C	C	B	D	C	B	C
Butyl acetate	172	D	D	B	D	A	D	D
Acetic acid	172	B	B	B	C	A	C	B
Butyl stearate	172	B	B	D	A	A	D	D
Acetic anhydride	172	C	D	B	D	A	B	B
Butylaldehyde	172	D	D	B	D	B	D	D
Acetone	172	D	D	A	D	A	D	D
Butylene	172	B	B	D	A	A	D	C
Acetonitrile	172	D	-	D	C	A	D	D
Cadmium cyanide	172	C	C	A	C	A	B	A
Acetophenone	172	D	D	A	D	A	D	D
Calcium acetate	172	B	B	A	D	A	D	B
Acetyl chloride	172	D	D	D	A	A	D	D
Calcium acetate (65 deg C)	172	B	-	A	D	A	D	B
Acetylacetone	172	D	D	A	D	A	D	D
Calcium carbide	172	-	-	-	-	A	-	-
Acetylene	172	A	A	A	A	A	B	B
Calcium carbonate	172	A	A	A	A	A	A	A
Air (50 deg C)	172	A	A	A	A	A	A	A
Calcium hydroxide	172	A	A	A	A	A	A	A
Aluminium bromide	172	A	A	A	A	A	A	A
Calcium nitrate (65 deg C)	172	A	-	A	A	A	B	A
Aluminium chloride	172	A	A	A	A	A	B	A
Calcium perchlorate	172	D	-	D	D	-	D	D
Aluminium nitrate	172	A	A	A	A	A	B	A
Calcium sulfate	172	C	C	A	C	A	B	A
Aluminium sulfate	172	A	A	A	A	A	A	B
Calcium sulfate (65 deg C)	172	D	-	A	C	A	B	A
Amine mixture	172	D	D	B	D	D	B	B
Calcium sulfite	172	A	A	A	A	A	A	B
Ammonia (anhydrous)	172	B	B	A	D	B	B	A
Carbitol	172	B	B	B	B	A	B	B
Ammonia (Liquid) (65 deg C)	172	C	-	-	D	A	-	C
Carbon dioxide gas (65 deg C)	172	A	-	B	B	-	B	B
Ammonia (Liquid) (Cool)	172	C	-	A	D	A	B	B
Carbon disulfide	172	D	D	D	A	A	D	D
Ammonia gas (Low temperature)	172	A	A	A	D	A	A	A
Carbon monoxide (65 deg C)	172	A	A	A	A	A	A	B
Ammonium carbonate	172	D	D	A	A	A	D	A
Carbon tetrachloride	172	B	B	D	A	A	D	D
Ammonium chloride	172	A	A	A	A	A	D	A
Castor oil	172	A	A	B	A	A	A	A
Ammonium hydroxide	172	D	D	A	D	D	A	C
Chlorine (liquid)	172	D	-	D	D	B	D	D
Ammonium magnesium sulfate	172	D	-	D	D	-	D	D
Chlorine gas	172	B	B	D	A	A	D	D
Ammonium nitrate (65 deg C)	172	A	A	A	-	-	B	A
Chlorine water	172	C	C	B	A	A	D	D
Ammonium phosphate (65 deg C)	172	A	-	A	D	A	B	A
Chloroacetone	172	D	D	A	D	A	D	D

A = Practically no harm, and can be used (Excellent); B = Some harm may be inevitable but can be used under restrictions (Good); C = Should be avoided if at all possible (Not recommended); D = Should not be used (Unsuitable)

Body material by fluid

The body material decides corrosion resistance and permissible pressure. Steel is the standard for compressed air, brass and stainless steel are used for water and more aggressive fluids.

Body material	Properties	Fluids
Brass	-	-
Stainless Steel	-	-
Steel	-	-
Aluminum	-	-
Polypropylene	-	-

Unit conversion

Quantity	Unit	Equals
Length	1 m	1x10^2 cm, 3.937x10 in, 3.281 ft, 1.094 yd
Length	1 cm	1x10^-2 m, 3.937x10^-1 in, 3.281x10^-2 ft, 1.094x10^-2 yd
Length	1 in	2.54x10^-2 m, 2.540 cm, 8.333x10^-2 ft, 2.778x10^-2 yd
Length	1 ft	3.048x10^-1 m, 3.048x10 cm, 1.2x10 in, 3.333x10^-1 yd
Length	1 yd	9.144x10^-1 m, 9.144x10 cm, 3.6x10 in, 3 ft
Length	1 km	6.214x10^-1 mile, 5.400x10^-1 n-mile
Length	1 mile	1.6093 km, 8.690x10^-1 n-mile
Length	1 n-mile	1.852 km, 1.151 mile
Area	1 m2	1.550x10^3 in2, 1.076x10 ft2, 1.196 yd2
Area	1 in2	6.452x10^-4 m2, 6.944x10^-3 ft2, 7.716x10^-4 yd2
Area	1 ft2	9.290x10^-2 m2, 1.44x10^2 in2, 1.111x10^-1 yd2
Area	1 yd2	8.361x10^-1 m2, 1.296x10^3 in2, 9 ft2
Area	1 km2	2.471x10^2 acre, 3.861x10^-1 mile2, 1.00x10^2 ha
Area	1 acre	4.047x10^-3 km2, 1.563x10^-3 mile2, 4.047x10^-1 ha
Area	1 mile2	2.590 km2, 6.40x10^2 acre, 2.590x10^2 ha
Area	1 ha	1x10^-2 km2, 2.471 acre, 3.861x10^-3 mile2
Mass (Weight)	1 kg	1.543x10^4 gr, 3.527x10 oz, 2.205 lb, 1x10^-3 t (metric ton), 9.842x10^-4 ltn (long ton), 1.102x10^-3 stn (short ton)
Mass (Weight)	1 gr	6.480x10^-5 kg, 2.286x10^-3 oz, 1.429x10^-4 lb, 6.480x10^-8 t (metric ton), 6.378x10^-8 ltn (long ton), 7.143x10^-8 stn (short ton)
Mass (Weight)	1 oz	2.835x10^-2 kg, 4.375x10^2 gr, 6.25x10^-2 lb, 2.835x10^-5 t (metric ton), 2.790x10^-5 ltn (long ton), 3.125x10^-5 stn (short ton)
Mass (Weight)	1 lb	4.536x10^-1 kg, 7.000x10^3 gr, 1.6x10 oz, 4.536x10^-4 t (metric ton), 4.464x10^-4 ltn (long ton), 5x10^-4 stn (short ton)
Mass (Weight)	1 t (metric ton)	1.000x10^3 kg, 1.543x10^7 gr, 3.5274x10^4 oz, 2.205x10^3 lb, 9.842x10^-1 ltn (long ton), 1.102 stn (short ton)
Mass (Weight)	1 ltn (long ton)	1.016x10^3 kg, 1.568x10^7 gr, 3.5840x10^4 oz, 2.240x10^3 lb, 1.016 t (metric ton), 1.12 stn (short ton)
Mass (Weight)	1 stn (short ton)	9.072x10^2 kg, 1.4x10^7 gr, 3.2000x10^4 oz, 2.000x10^3 lb, 9.072x10^-1 t (metric ton), 8.929x10^-1 ltn (long ton)
Force	1 N	1.020x10^-1 kgf, 2.248x10^-1 lbf, 7.233 pdl
Force	1 kgf	9.807 N, 2.205 lbf, 7.093x10 pdl
Force	1 lbf	4.448 N, 4.536x10^-1 kgf, 3.217x10 pdl
Force	1 pdl	1.383x10^-1 N, 1.410x10^-2 kgf, 3.108x10^-2 lbf
Pressure	1 MPa	1.020x10 kgf/cm2, 1.450x10^2 lbf/in2 (PSI), 9.869 atm, 7.501x10^3 mmHg, 2.953x10^2 inHg, 1.01972x10^5 mmH2O, 3.346x10^2 ftH2O
Pressure	1 kgf/cm2	9.807x10^-2 MPa, 1.422x10 lbf/in2 (PSI), 9.678x10^-1 atm, 7.356x10^2 mmHg, 2.896x10 inHg, 1.0000x10^4 mmH2O, 3.281x10 ftH2O
Pressure	1 lbf/in2 (PSI)	6.895x10^-3 MPa, 7.031x10^-2 kgf/cm2, 6.805x10^-2 atm, 5.171x10 mmHg, 2.036 inHg, 7.031x10^2 mmH2O, 2.307 ftH2O
Pressure	1 atm	1.013x10^-1 MPa, 1.033 kgf/cm2, 1.470x10 lbf/in2 (PSI), 7.60x10^2 mmHg, 2.992x10 inHg, 1.0332x10^4 mmH2O, 3.390x10 ftH2O
Pressure	1 mmHg	1.333x10^-4 MPa, 1.360x10^-3 kgf/cm2, 1.934x10^-2 lbf/in2 (PSI), 1.316x10^-3 atm, 3.937x10^-2 inHg, 1.360x10 mmH2O, 4.460x10^-2 ftH2O
Pressure	1 inHg	3.386x10^-3 MPa, 3.453x10^-2 kgf/cm2, 4.912x10^-1 lbf/in2 (PSI), 3.342x10^-2 atm, 2.54x10 mmHg, 3.453x10^2 mmH2O, 1.133 ftH2O
Pressure	1 mmH2O	9.806x10^-6 MPa, 1x10^-4 kgf/cm2, 1.422x10^-3 lbf/in2 (PSI), 9.678x10^-5 atm, 7.355x10^-2 mmHg, 2.896x10^-3 inHg, 3.281x10^-3 ftH2O
Pressure	1 ftH2O	2.989x10^-3 MPa, 3.048x10^-2 kgf/cm2, 4.335x10^-1 lbf/in2 (PSI), 2.950x10^-2 atm, 2.242x10 mmHg, 8.827x10^-1 inHg, 3.048x10^2 mmH2O

Taper pipe threads to JIS B 0203

Thread	Pitch	Note
R 1/8	0.9071	-
R 1/4	1.3368	-
R 3/8	1.3368	-
R 1/2	1.8143	-
R 3/4	1.8143	-
R1	2.3091	-
R 1-1/4	2.3091	-
R 1-1/2	2.3091	-
R2	2.3091	-
R 2-1/2	2.3091	-
R3	2.3091	-
R4	2.3091	-
R5	2.3091	-
R6	2.3091	-

Safety in service

Depressurise the line before disconnecting. A coupling parted under pressure whips back and the escaping fluid can injure eyes and skin.
Connect plugs and sockets only within the same series and size. Other makes are built to different tolerances and the joint can release under pressure.
Never exceed the permissible working pressure or temperature of the series, not even briefly on a pressure peak.
Match the seal material to the fluid. An unsuitable material swells or hardens and the coupling starts to leak.
Do not use a coupling as a load bearing part, a joint or a suspension point.
Inspect seals and wear parts regularly and replace them at the first sign of leakage. Do not keep a damaged coupling in service.

This page is based on the Nitto Kohki general catalogue Quick Connect Couplings C01en-b, 190 pages. The complete catalogue is available for download on this page.