Series 525, DN10

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Hydraulic Products

Nordic Range Steel Couplings & Nipples

Series 525, DN10

  • 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 12.5, DN 20 and DN 25. 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: 3/8" (10 mm)
Rated flow: 18.2 GPM (69 l/min)
Max. working pressure connected: 5080 PSI (350 bar)
Max. working pressure disconnected: 4060 PSI (280 bar)
Min. burst pressure connected: 18860 PSI (1300 bar)
Min. burst pressure disconnected: 15950 PSI (1100 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 105251204G 3/8"61.63524NBR
 105251214G 3/8"61.63524FPM


Couplings without valve Part No. Connection Length Diameter Hexagon Seal
Female thread 105250204G 3/8"61.63524NBR


Coupling with pressure eliminator Part No. Connection Length Diameter Hexagon Seal
Female thread 105251234G 3/8"61.63524NBR


Nipples Part No. Connection Length Diameter Hexagon Seal
Female thread 105256204G 3/8"382422NBR
 105256214G 3/8"382422FPM


Nipples without valve Part No. Connection Length Diameter Hexagon Seal
Female thread 105255204G 3/8"382422-


Nipples with pressure eliminator Part No. Connection Length Diameter Hexagon Seal
Female thread 105256234G 3/8"382422NBR


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