Pneumatic Products, Button Style Couplings & Nipples

Series 291, DN 5.5

  • Compact design
  • Complies with safety standard 4414
  • Disconnection in two stages

Compact and light quick-connect coupling, newly shaped in order to meet ergonomic and industrial design requirements. Serie 291 has an easy and safe connection/disconnection and complies with ISO 4414 (safety standard). The nipple profile complies with ISO 6150 C.


The Series is also available in two larger sizes: Series 381 and 471.

Series 291, DN 5.5
Technical Data
Nominal flow diameter: 5.5 mm (7/32")
Air flow: 640 l/min (22.6 CFM)
Max. working pressure: 12 bar (174 PSI)
Min. burst pressure: 48 bar (696 PSI)
Temperature range: -20°C — +90°C (-4°F — +194°F)
Material coupling: Steel
Material nipple: Nickel-plated steel
Standards: ISO 6150 C DN 5.5
Markets: France

Flow capacity measured at 6 bar (87 PSI) inlet pressure and pressure drop at 0.5 bar (7 PSI).

Air Flow
Pressure drop, bar (PSI)
Series 291, DN 5.5
Flow, l/min. (CFM)
Couplings Part No. Connection
Hose connection 10 291 30021029130026.3 mm (1/4")
 10 291 30031029130038 mm (5/16")
 10 291 300410291300410 mm (3/8")
Male thread 10 291 3152102913152R 1/4"
 10 291 3154102913154R 3/8"
 10 291 3155102913155R 1/2"
Female thread 10 291 3202102913202G 1/4"
 10 291 3204102913204G 3/8"
 10 291 3205102913205G 1/2"


Nipples Part No. Connection
Hose connection 10 291 50321029150326.3 mm (1/4")
 10 291 50331029150338 mm (5/16")
 10 291 503410291503410 mm (3/8")
Male thread 10 291 5131102915131R 1/8"
 10 291 5132102915132R 1/4"
 10 291 5134102915134R 3/8"
Female thread 10 291 5231102915231G 1/8"
 10 291 5232102915232G 1/4"
 10 291 5234102915234G 3/8"


Check with an authorized CEJN distributor for availability and prices. Other connections and sealing material on request. Some part numbers may be subject to minimum order quantities. CEJN reserves the right to make changes without further notification. Thread connections are listed according to ISO Standards.

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