Pneumatic Products, Standard Couplings & Nipples

Series 303, DN 6.5

  • Strong and durable
  • One-hand operated
  • Low connection force

Series 303 couplings offer high-flow capacity and are insensitive to vibrations. A wide range of connections is included in the Series, which is also suitable for vacuum service. Male threads on the couplings and nipples feature pre-applied thread sealant.


Series 303, DN 6.5
Technical data
Nominal flow diameter: 6.5 mm (1/4")
Air flow: 1450 l/min (51.2 CFM)
Max. working pressure: 16 bar (232 PSI)
Min. burst pressure: 140 bar (2030 PSI)
Connection force: 85 N
Temperature range: -20°C — +100°C (-4°F — +212°F)
Material coupling: Zinc-plated steel/brass
Material nipple: Hardened zinc-plated steel
Interchangeable with: Rectus 31, Tema 1300
Standards: Scandinavian Standard, 6.5 mm
Markets: Finland, Sweden

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

Air Flow
Pressure drop, bar (PSI)
Series 303, DN 6.5
Flow, l/min. (CFM)
Couplings Part No. Connection
Hose connection 10 303 10021030310026.3 mm (1/4")
 10 303 10031030310038 mm (5/16")
 10 303 100410303100410 mm (3/8")
 10 303 100510303100513 mm (1/2")
Male thread 10 303 1152103031152R 1/4"
 10 303 1154103031154R 3/8"
 10 303 1155103031155R 1/2"
Female thread 10 303 1202103031202G 1/4"
 10 303 1204103031204G 3/8"
 10 303 1205103031205G 1/2"
Stream-Line connection 10 303 10581030310585x8 mm
 10 303 10601030310606.5x10 mm
 10 303 10621030310628x12 mm
 10 303 10631030310639.5x13.5 mm
 10 303 106610303106611x16 mm


Nipples Part No. Connection
Hose connection 10 303 50021030350026.3 mm (1/4")
 10 303 50031030350038 mm (5/16")
 10 303 500410303500410 mm (3/8")
 10 303 500510303500513 mm (1/2")
Male thread 10 303 5151103035151R 1/8"
 10 303 5152103035152R 1/4"
 10 303 5154103035154R 3/8"
 10 303 5155103035155R 1/2"
Female thread 10 303 5201103035201G 1/8"
 10 303 5202103035202G 1/4"
 10 303 5204103035204G 3/8"
 10 303 5205103035205G 1/2"
Stream-Line connection 10 303 50581030350585x8 mm
 10 303 50601030350606.5x10 mm
 10 303 50621030350628x12 mm
 10 303 50631030350639.5x13.5 mm
 10 303 506610303506611x16 mm


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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