For High PressureSpecifications
Special steel (Bright chromate conversion coating : silver)

Body material

1/4", 3/8"

1/2", 3/4", 1"

MPa

31.5

27.5

kgf/cm2

321

281

bar

315

275

PSI45703990

Size (Thread)

280 Cupla
For hydraulic pressure up to 27.5 to 31.5 MPa {281 to 321 kgf/cm2}
Working pressure

Valve structure

Seal material
Working temperature range

Applicable fluid

Workingtemperature range

Seal material

MarkNitrile rubber

NBR (SG)Nm {kgf • cm}

Size (Thread)Two-way shut-off

Hydraulic oil

Generic Cupla copes with highpressure lines in hydraulic equipment!
Low pressure loss is ideal for hydraulicequipment.
• Conforms to international standard ISO 7241-1A.
• General purpose hydraulic Cuplas with the working pressure up to
27.5 to 31.5 MPa {281 to 321 kgf/cm2}.
• Structure keeps pressure loss extremely low, particularly ideal for hydraulicapplications requiring high flow rates.
• Both socket and plug have built-in automatic shut-off valves to prevent fluid spillout when disconnected. Easy to handle.
• Special steel body material is adopted for its excellent strength and additional
quenching treatment is done to withstand hydro pressure impacts.

TorqueRemarks-20˚C to +80˚C Standard materialMax. Tightening Torque27.5 to 31.5
27.5 to 31.5 MPa{281 to 321 kgf/cm2}

Working pressure

1"

3/4"

1/4"

3/8"

1/2"

28 {286}

40 {408}

80 {816}100 {1020} 180 {1836}

Flow Direction
Fluid flow can be bi-directional when socket and plug are connected.

Interchangeability
Different sizes cannot be connected.
(mm2)Min. Cross-Sectional Area
Model

280-2SP

280-3SP

280-4SP

280-6SP

280-8SP

Min. cross-sectional area

11.4

42.879.1

146.5

235.6

1.3 Pa {1 x 10-2 mmHg}

Suitability for Vacuum
Socket only

Plug only

When connected--Operational( mL)

Admixture of Air on Connection May vary depending upon the usage conditions.
Model

280-2SP

280-3SP

280-4SP

280-6SP

280-8SP

Volume of air

0.37

1.02

2.63

8.83

16.04

Flow Rate – Pressure Loss Characteristics[Test conditions]• Fluid : Hydraulic oil • Temperature : 30˚C 5˚C• Fluid viscosity : 32 x 10-6 m2/s • Density : 0.87 x 103 kg/m3

1.0{10}280-6SP0.5{5}

Pressure loss in MPa {kgf/cm2}

280-2SP
280-8SP
0.1{1}
0.05{0.5}

280-3SP
280-4SP

0.01{0.1}
110100200 300

Flow rate in L/min

Precautions for use
There is no interchangeability between 280 Cupla and HSP Cupla or 210 Cupla.
Do not connect each other even if some sizes are approximate.

91

280 Cupla
Models and Dimensions

Plug

WAF : WAF stands for width across flats.

Female thread

SocketFemale thread

T

D

DTCH

HLL

Model

Application

Mass (g)280-2P
280-3P
280-4P
280-6P
280-8P

R 1/4
R 3/8
R 1/2
R 3/4R1

3559
115
178
331

Dimensions (mm)

L
31.5
35
44
52.5
63.5

øD
20.5
25
32
35
44

C
15
18.5
24.5
28
35

H(WAF)
Hex.19Hex.23
Hex.29Hex.32
41

T
Rc 1/4Rc 3/8Rc 1/2
Rc 3/4
Rc 1

Model

Application

Mass (g)280-2S
280-3S
280-4S
280-6S
280-8S

R 1/4
R 3/8
R 1/2
R 3/4
R1

110
185
335
571
871

Dimensions (mm)

L
46
53
66.5
8198

øD
(27)
(33)
(39)
(48)
(55)

H(WAF)
1923
29
3541

T
Rc 1/4Rc 3/8Rc 1/2
Rc 3/4
Rc 1* Internal structural design of 280-6S and 280-8S is partly different from the above drawing.

Application Example

Hydraulic pressure control equipment

Hydraulic pressure control equipment

Before use, please be sure to read “Safety Guide” described at the end of this book and “Instruction Sheet” that comes with the products.

92