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

Series 525, DN6.3

  • Manual locking ring for extra security
  • High durability
  • Sturdy design

Series 525 is a family of quick couplings for hydraulic systems. A manually operated locking ring provides extra security against involuntary disconnection. 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 10 (3/8"), DN 12.5 (1/2"), 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, DN6.3
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: Without pressure
Disconnection under pressure: Not allowed
Max. working pressure connected: 450 bar (6526 PSI)
Max. working pressure disconnected: 300 bar (4351 PSI)
Min. burst pressure connected: 1800 bar (26106 PSI)
Min. burst pressure disconnected: 1200 bar (17404 PSI)

Rated flow is measured at 0.4 MPa pressure drop.

Pressure drop chart
Series 525, DN6.3
Couplings Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 1202105251202G 1/4"602621NBR
 10 525 1212105251212G 1/4"602621FPM


Couplings without valve Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 0202105250202G 1/4"602621NBR


Nipples Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 6202105256202G 1/4"48.22119NBR
 10 525 6212105256212G 1/4"48.22119FPM


Nipples without valve Part No. Connection Length Diameter Hexagon Seal
Female thread 10 525 5202105255202G 1/4"48.22119-


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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