Series 525, DN25

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Hydraulic Products

Nordic Range Steel Couplings & Nipples

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. Both couplings and nipples are made of zinc-passivated steel for maximum durability in tough applications and environments.


The Series is also available in four other sizes: DN 6.3, DN 10, DN 12.5 and DN 20. For a stainless steel version see Series 526. A version with viton seals and a free flow version are also available (without valve package).

Technical data
Nominal flow diameter: 1" (25 mm)
Rated flow: 97.7 GPM (370 l/min)
Max. working pressure connected: 3630 PSI (250 bar)
Max. working pressure disconnected: 3630 PSI (250 bar)
Min. burst pressure connected: 13490 PSI (930 bar)
Min. burst pressure disconnected: 14500 PSI (1000 bar)
Temperature range: -22°F — +212°F (-30°C — +100°C)
Material coupling: Steel (zinc passivation)
Material nipple: Hardened steel (zinc passivation)
Material seal: Nitrile (NBR)
Connectability: Part under pressure equipped with eliminator, other part free to drain.
Disconnection under pressure: Not allowed

Flow capacity is measured at 58 PSI pressure drop.

Pressure drop chart

Pressure drop, PSI

Flow, GPM
Couplings Part No. Connection Length Diameter Hexagon Seal
Female thread 105251209G 1"926248NBR
 105251219G 1"926248FPM


Couplings without valve Part No. Connection Length Diameter Hexagon Seal
Female thread 105250209G 1"926248NBR


Couplings with pressure eliminator Part No. Connection Length Diameter Hexagon Seal
Female thread 105251239G 1"926248NBR


Nipples Part No. Connection Length Diameter Hexagon Seal
Female thread 105256209G 1"56.54845NBR
 105256219G 1"56.54845FPM


Nipples without valve Part No. Connection Length Diameter Hexagon Seal
Female thread 105255209G 1"56.54845-


Nipples with pressure eliminator Part No. Connection Length Diameter Hexagon Seal
Female thread 105256239G 1"56.54845NBR


Thread connections are listed according to ISO Standards. All measurements are in mm. Check with an authorized CEJN distributor for availability and prices.