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

Series 525, DN20

  • 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 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, DN20
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: 280 bar (4061 PSI)
Max. working pressure disconnected: 200 bar (2900 PSI)
Min. burst pressure connected: 1000 bar (14503 PSI)
Min. burst pressure disconnected: 800 bar (11603 PSI)

Rated flow is measured at 0.4 MPa pressure drop.

Pressure drop chart
Series 525, DN20
Couplings Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 1207105251207G 3/4"76.25238NBR
 10 525 1217105251217G 3/4"76.25238FPM


Couplings without valve Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 0207105250207G 3/4"76.25238NBR


Couplings with pressure eliminator Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 1237105251237G 3/4"76.25238NBR


Nipples Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 6207105256207G 3/4"473936NBR
 10 525 6217105256217G 3/4"473936FPM


Nipples without valve Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 5207105255207G 3/4"473936-


Nipples with pressure eliminator Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 6237105256237G 3/4"473936NBR


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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