Hydraulic Products, Nordic Range / 525 - High Performance Poppet Type Couplings

Series 525, DN25

  • Manual locking ring for extra security
  • High durability
  • Optional pressure eliminator

Series 525 is a family of quick couplings for hydraulic systems. A manually operated locking ring provides extra security against involuntary disconnection. An extra option for Series 525 couplings and nipples is a pressure eliminator for evacuating residual pressure during connection. Both couplings and nipples are made of steel with Zinc-Nickel surface for maximum durability in tough applications and environments.


The Series is also available in four other sizes: DN 6.3 (1/4"), DN 10 (3/8"), DN 12.5 (1/2") and DN 20 (3/4"). Available are also a version with viton seals and a free flow version (without valve package).

Series 525, DN25
Technical data
Temperature range: -30°C — +100°C (-22°F — +212°F)
Material coupling: Steel (zinc-nickel)
Material nipple: Hardened steel (zinc-nickel)
Material seal: Nitril (NBR) alt. FPM
Connectability: Part under pressure equipped with eliminator, other part free to drain.
Disconnection under pressure: Not allowed
Max. working pressure connected: 250 bar (3625 PSI)
Max. working pressure disconnected: 250 bar (3625 PSI)
Min. burst pressure connected: 930 bar (13488 PSI)
Min. burst pressure disconnected: 1000 bar (14503 PSI)

Rated flow is measured at 0.4 MPa pressure drop.

Pressure drop chart
Series 525, DN25
Couplings Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 1209105251209G 1"926248NBR
 10 525 1219105251219G 1"926248FPM


Couplings without valve Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 0209105250209G 1"926248NBR


Couplings with pressure eliminator Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 1239105251239G 1"926248NBR


Nipples Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 6209105256209G 1"56.54845NBR
 10 525 6219105256219G 1"56.54845FPM


Nipples without valve Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 5209105255209G 1"56.54845-


Nipples with pressure eliminator Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 6239105256239G 1"56.54845NBR


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. All measurements are in mm.

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