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

Series 525, DN12.5

  • 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. Series 525 couplings and nipples have a pressure eliminator as an extra feature for evacuating residual pressure during connection. Both components 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 20 (3/4") and DN 25 (1"). For a stainless steel version see Series 526. Available are also a version with viton seals and a free flow version (without valve package).

Series 525, DN12.5
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: 300 bar (4351 PSI)
Max. working pressure disconnected: 250 bar (3625 PSI)
Min. burst pressure connected: 1100 bar (15954 PSI)
Min. burst pressure disconnected: 1000 bar (14503 PSI)

Rated flow is measured at 0.4 MPa pressure drop.

Pressure drop chart
Series 525, DN12.5
Couplings Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 1205105251205G 1/2"67.64133NBR
 10 525 1215105251215G 1/2"67.64133FPM


Couplings without valve Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 0205105250205G 1/2"67.64130NBR


Couplings with pressure eliminator Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 1235105251235G 1/2"67.64133NBR


Nipples Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 6205105256205G 1/2"42.52927NBR
 10 525 6215105256215G 1/2"42.52927FPM


Nipples without valve Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 5205105255205G 1/2"42.52927-


Nipples with pressure eliminator Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 6235105256235G 1/2"42.52927NBR


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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