Mold Cupla

Mold Making

The Nitto Kohki Mold Cupla is a mould-making quick coupling for cooling circuits for cooling and tempering media (water, oil) with an operating pressure up to approx. 1.5 MPa. Compact and heat-resistant, also for braided-hose connection (BH adapters).

As an authorised Nitto Kohki distributor we stock 52 variants of the Mold Cupla - bodies in brass, NBR, FKM seals, model series Mold / BH-Adapter.

⚡up to approx. 1.5 MPa - operating-pressure range for cooling and tempering media (water, oil)

⚙brass - body materials; NBR, FKM seals

✓Key feature - Compact and heat-resistant, also for braided-hose connection (BH adapters)

🔩52 variants in stock - model series Mold / BH-Adapter

Parameter	Value
Type	mould-making quick coupling for cooling circuits
Operating pressure	up to approx. 1.5 MPa
Body materials	brass
Seals	NBR, FKM
Media	cooling and tempering media (water, oil)
Model series	Mold / BH-Adapter
Variants in range	52

Typical applications: mould cooling circuits in injection moulding, tempering of moulds and heating platens, fast mould changes.

52 variants in stockMold Cupla - Mold / BH-Adapter

up to approx. 1.5 MPabrass, NBR, FKM

Technical data from the manufacturer catalogue

Series	MOLD CUPLA Series
Body material	Brass
Seal material	Nitrile rubber (NBR), Fluoro rubber (FKM)
Max working pressure	1.0 MPa {10 kgf/cm2, 10 bar, 145 PSI}
Working temperature	Nitrile rubber (NBR): -20 °C to +80 °C \| Fluoro rubber (FKM): -20 °C to +180 °C
Valve structure	One-way shut-off, Straight through
Applicable fluids	Water, Heated oil
Vacuum service	Not suitable for vacuum application in either connected or disconnected condition.
Size range	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
Catalogue page	C01en-b, 73

Operating principle

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

Connecting sequence of a ball locking quick connect coupling.

Space saving design for molds with closely spaced coolant ports.
Long sleeve socket facilitates connection/disconnection with plug embedded in mold.
Enables quick mold cooling water line connection/disconnection.
Various sizes and end configurations to suit a wide variety of mold applications.
Can be connected with SUPER CUPLA, excluding K3 and K4 types.
Push-to-connect design. (Built-in automatic shut-off valve in the socket) Also available is CUPLA without valve (Please specify in ordering).
CUPLA for braided hose connection requires no hose clamp. (Model K-90SN)
Designed for quick replacement for die and mold.

All models of the series

PH - Hose barb

Model	Coupling part	Application	Brass (g)	L	H	A	C	T	øBp	øBd
K-02PH	Plug	1/4 inch hose	17	42	12	21	15	8	4.5	6
K-03PH	Plug	3/8 inch hose	19	42	15	21	15	12	7	6

SH - Hose barb

Model	Coupling part	Application	Brass (g)	L	øD	A	C	T	øB	øN	ød
K-02SH	Socket	1/4 inch hose	52	(67)	(21)	29	29	8	5	16.8	18.5
K-02TSH	Socket	1/4 inch hose	52	(67)	(21)	29	29	8	5	16.8	18.5
K-03SH	Socket	3/8 inch hose	60	(59)	(21)	29	21	12	7	16.8	18.5
K-03TSH	Socket	3/8 inch hose	60	(59)	(21)	29	21	12	7	16.8	18.5

PM - Male thread

Model	Coupling part	Application	Brass (g)	L	C	T	øB	øH(WAF)
K-01PM	Plug	Rc 1/8	14	31	15	R 1/8	5.5	Hex.12
K-02PM	Plug	Rc 1/4	20	34	15	R 1/4	6	Hex.14
K-03PM	Plug	Rc 3/8	35	35	15	R 3/8	6	Hex.17

SM - Male thread

Model	Coupling part	Application	Brass (g)	L	øD	A	T	øB	øH(WAF)	øN	ød
K-02SM	Socket	Rc 1/4	70	(51)	(21)	29	R 1/4	6	Hex.17	16.8	18.5
K-02TSM	Socket	Rc 1/4	70	(51)	(21)	29	R 1/4	6	Hex.17	16.8	18.5
K-03SM	Socket	Rc 3/8	82	(52)	(21)	29	R 3/8	6	Hex.19	16.8	18.5
K-03TSM	Socket	Rc 3/8	82	(52)	(21)	29	R 3/8	6	Hex.19	16.8	18.5

PF - Female thread

Model	Coupling part	Application	Brass (g)	L	C	T	øB	øH(WAF)
K-01PF	Plug	R 1/8	16	28	15	Rc 1/8	6	Hex.14
K-02PF	Plug	R 1/4	22	30.5	15	Rc 1/4	6	Hex.17
K-03PF	Plug	R 3/8	35	32	15	Rc 3/8	6	Hex.21

SF - Female thread

Model	Coupling part	Application	Brass (g)	L	øD	A	C	T	øH(WAF)	øN	ød
K-02SF	Socket	R 1/4	57	(46.5)	(21)	29	14.5	Rc 1/4	Hex.17	16.8	18.5
K-02TSF	Socket	R 1/4	57	(46.5)	(21)	29	14.5	Rc 1/4	Hex.17	16.8	18.5

SHL - Hose barb

Model	Coupling part	Application	Brass (g)	L	H	øD	A	C	T	øB	øN	ød
K-02SHL	Socket	1/4 inch hose	79	(52)	(42.5)	(21)	29	21	8	4.5	16.8	18.5
K-03SHL	Socket	3/8 inch hose	87	(52)	(42.5)	(21)	29	21	12	7	16.8	18.5
K-03TSHL	Socket	3/8 inch hose	87	(52)	(42.5)	(21)	29	21	12	7	16.8	18.5

PML - Male thread

Model	Coupling part	Application	Brass (g)	L	H	C	T	øB
K-01PML	Plug	Rc 1/8	43	33.5	30.5	15	R 1/8	5
K-02PML	Plug	Rc 1/4	53	33.5	33.5	15	R 1/4	6
K-03PML	Plug	Rc 3/8	71	33.5	33.5	15	R 3/8	6

PM-HH - Male thread, with internal hexagon socket for Allen wrench

Model	Coupling part	Application	Brass (g)	L	H	C	T	øB	øOutside Diameter
K-01PM-HH	Plug	Rc 1/8	9	27	5	15	R 1/8	6	11
K-02PM-HH	Plug	Rc 1/4	15	29	5	15	R 1/4	6	(13.4)

SN - For braided hose connection

Model	Coupling part	Application	Brass (g)	L	øD	A	øB	øH1(WAF)	øH2(WAF)	øN	ød
K-90SN	Socket	Braided hose 9 mm x 15 mm, hose wall thickness 3 +/- 0.3 mm	122	(63)	(21)	29	8.5	Hex.23	Hex.24	16.8	18.5

HF-PH - Hose barb / High flow type

Model	Coupling part	Application	Brass (g)	L	H	A	C	T	øBp	øBd
K3-03PH	Plug	3/8 inch hose	19	42.5	14	21	17.5	12	7	9.5

HF-SH - Hose barb / High flow type

Model	Coupling part	Application	Brass (g)	L	øD	A	C	T	øB	øN	ød
K3-03SH	Socket	3/8 inch hose	100	(65)	(24)	25.5	21	12	7	19	22.5
K3-04SH	Socket	1/2 inch hose	102	(67)	(24)	25.5	23	15	10	19	22.5
K4-04SH	Socket	1/2 inch hose	226	(82)	(32)	34	23	15	10	26.5	30

HF-PM - Male thread / High flow type

Model	Coupling part	Application	Brass (g)	L	C	T	øB	øH(WAF)
K3-02PM	Plug	Rc 1/4	16	36	17.5	R 1/4	9	Hex.14
K3-03PM	Plug	Rc 3/8	25	36	17.5	R 3/8	9.5	Hex.17
K4-04PM	Plug	Rc 1/2	50	46	21.5	R 1/2	13	Hex.22

HF-SM - Male thread / High flow type

Model	Coupling part	Application	Brass (g)	L	øD	A	T	øB	øH(WAF)	øN	ød
K3-03SM	Socket	Rc 3/8	90	(56)	(24)	25.5	R 3/8	12	Hex.21	19	22.5

HF-PF - Female thread / High flow type

Model	Coupling part	Application	Brass (g)	L	C	T	øB	øH(WAF)
K3-03PF	Plug	R 3/8	30	33	17.5	Rc 3/8	9.5	Hex.21

HF-SF - Female thread / High flow type

Model	Coupling part	Application	Brass (g)	L	øD	A	T	øH(WAF)	øN	ød
K3-03SF	Socket	R 3/8	87	(49)	(24)	25.5	Rc 3/8	Hex.21	19	22.5

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
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
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

Choose MOLD CUPLA where a mold coolant or heated oil port has to be connected and disconnected quickly at 1.0 MPa {10 kgf/cm2} with a one-way shut-off valve in the socket, and where the compact body and the long sleeve socket are needed for closely spaced or embedded ports. HOT WATER CUPLA HW Type, the sibling in this group, is rated 2.0 MPa {20 kgf/cm2} with two-way shut-off, so it is the choice above 1.0 MPa {10 kgf/cm2} or when both sides must close on disconnection. Within MOLD CUPLA, the High Flow Type K3 and K4 series give almost double the flow rate of the standard K-01, K-02 and K-03 series but are not interchangeable with them.

Body and seal materials

Body material
Brass

Seal material	Mark	Working temperature	Remarks
Nitrile rubber	NBR	-20 °C to +80 °C	Standard material
Fluoro rubber	FKM	-20 °C to +180 °C	Available on request

Further catalogue data

Note	Value
Maximum tightening torque, standard series	1/8 inch: 5 {51} Nm {kgf . cm}; 1/4 inch: 9 {92}; 3/8 inch: 11 {112}
Maximum tightening torque, High Flow Type	1/4 inch: 9 {92} Nm {kgf . cm}; 3/8 inch: 11 {112}; 1/2 inch: 20 {204}
Braided hose assembly	Tighten the nut until it is flush against the hose barb base after pushing a braided hose to the end. Please use braided hoses available in the market.
Flow direction	Fluid flow can be bi-directional when socket and plug are connected.
Minimum cross-sectional area (mm2), standard series	Sockets listed: K-02SH, K-02TSH, K-03SH, K-03TSH, K-02SM, K-02TSM, K-03SM, K-03TSM, K-02SF, K-02TSF, K-02SHL, K-03SHL, K-03TSHL, K-90SN. K-02PH: 15.5 with every socket. K-03PH, K-02PM, K-03PM, K-01PF, K-02PF, K-03PF, K-02PML and K-03PML: 19 with K-02SH and K-02TSH, 15.5 with K-02SHL, 28 with all other sockets. K-01PM, K-01PM-HH and K-02PM-HH: 19 with K-02SH and K-02TSH, 15.5 with K-02SHL, 23 with all other sockets. K-01PML: 19 with every socket except 15.5 with K-02SHL.
Minimum cross-sectional area (mm2), High Flow Type	K3-03PH: 38 with K3-03SH, K3-04SH, K3-03SM and K3-03SF, not connectable with K4-04SH. K3-02PM, K3-03PM and K3-03PF: 38 with K3-03SH and 62.5 with K3-04SH, K3-03SM and K3-03SF, not connectable with K4-04SH. K4-04PM: 78.5 with K4-04SH only.
Plug embedment dimensions (mm), standard series	K-01PM: D 20 or more, C 0 to 3, L 28. K-01PM-HH: D 20 or more, C 0 to 3, L 24. K-02PM: D 20 or more, C 0 to 3, L 29. K-02PM-HH: D 20 or more, C 0 to 3, L 24. K-03PM: D 20 or more, C 0 to 3, L 30.
Plug embedment dimensions (mm), High Flow Type	K3-02PM: D 24 or more, C 0 to 3, L 31. K3-03PM: D 24 or more, C 0 to 3, L 31. K4-04PM: D 32 or more, C 0 to 3, L 39.
Field result reported for K3 series	A customer replaced conventional K-0 series MOLD CUPLA with the K3 series and shortened the cooling time from 30 seconds to 21 seconds, an 18% reduction per shot, and increased productivity by 20%. Coolant water flow rate checked with a flow meter increased by 1.7 to 1.8 times compared to the conventional models.
Accessories shown with the series	FLOW MONITOR, replaceable flow vane type, for visual check of cooling water flow from 2 L/min (see page 167). FLOW METER with valve dedicated for mold cooling lines, with graduated scale and built-in flow rate adjustment valve (see page 168).
WAF	WAF stands for width across flats.
Flow rate	The pages give flow rate - pressure loss characteristic curves only, no tabulated flow values. Test fluid is water. Page 74 plots K-0 series socket x plug combinations and page 76 compares K-02SH x K-02PM, K-03SH x K-03PM, K3-03SH x K3-03PM and K4-04SH x K4-04PM. Both charts run from 1 to 100 L/min against 0.01 {0.1} to 1.0 {10} MPa {kgf/cm2}.

Interchangeability and size groups

Standard series: sockets and plugs can be connected regardless of end configurations and sizes. K-0 series are not interchangeable with the high flow type K3 and K4 series. K-0 series can be connected with SUPER CUPLA. High Flow Type: K3 series sockets and plugs can be connected regardless of end configuration and sizes; K4 series sockets and plugs can be connected regardless of end configuration and sizes; K3 series and K4 series are not interchangeable with each other and also not interchangeable with other K-0 series.

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.
Not suitable for vacuum application in either connected or disconnected condition.
Do not exceed the maximum tightening torque given for each thread size.
Please use braided hoses available in the market; braided hoses for SN type should be made of soft PVC and woven by reinforcement thread.
Socket interference prevents connection/disconnection when the embedment dimension C exceeds 3 mm.

All technical data on this page is taken from the Nitto Kohki general catalogue Quick Connect Couplings C01en-b, page 73. The complete catalogue is available for download on this page.