Captive quick-connect coupling I.D. 7.8, G 1/4 IT, red - Riegler 137560

Captive quick-connect coupling I.D. 7.8, bright brass, G 1/4 IT, red, max. 35 bar, Medium/ambiant temperature -20 °C to 100 °C One-hand quick disconnect couplings with a large bore. Different media can be connected safely and non-interchangeably even when space is restricted, thanks to the colour-coded coupling and plug and the different coupling profiles defined for each of the four colours. Only couplings and plugs of the same colour fit together. Areas of application: Pneumatic system, machine and plant engineering, measurement, monitoring and control systems, manufacturing industry, medical technology, chemical / pharmaceutical industry, automotive, food technology, aerospace.

Standards and origin

• Customs tariff number: 84818079
• Country of origin: DE

About Non-interchangeable, quick-lock couplings

Captive quick-connect couplings keep several media circuits apart in tight installations. Coupling and plug carry a colour code and each colour uses its own profile, so a line can only be connected to the circuit it belongs to. Depending on the version, maximum operating pressure is 25 to 35 bar.

What matters when choosing

• Connection: G 1/8, G 3/8, G 1/4 and G 1/2 are offered as male or female threads to suit the existing manifold or hose fitting.
• Colour and plug profile: assign one colour per media circuit. Coupling and plug must share that colour, otherwise the profiles will not mate.
• Sealant: NBR covers ordinary compressed air duties, FKM is the choice for more aggressive media and higher temperatures.
• Housing: plain brass and brass Ms58 for standard use, QPQ treated steel where frequent coupling meets a harsher environment.
• Overall length: allow for 45 to 75 mm when the coupling sits inside a panel or a cable duct.

Typical applications

• Work stations where compressed air and a second medium are tapped side by side
• Test and measuring benches running several separate circuits
• Jig and tool making with changing connection points
• Machines with separate circuits for cooling and control air
• Maintenance interfaces where mixing up lines has to be ruled out

Medium temperature runs from -20 °C to 100 °C and sealing is by NBR or FKM. Production takes place in Germany and Turkey.