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 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).

Download drawings/3dmodels

Technical data
Nominal flow diameter:	6.3 mm (1/4")
Rated flow:	29 l/min (6.4 GPM UK)
Max. working pressure connected:	45.0 MPa
Max. working pressure disconnected:	30.0 MPa
Min. burst pressure connected:	180.0 MPa
Min. burst pressure disconnected:	120.0 MPa
Temperature range:	-30°C — +100°C (-22°F — +212°F)
Material coupling:	Steel (zinc passivation)
Material nipple:	Hardened steel (zinc passivation)
Material seal:	Nitrile (NBR)
Connectability:	Without pressure
Disconnection under pressure:	Not allowed

Rated flow is measured at 0.4 MPa pressure drop.

Pressure drop chart

Pressure drop, MPa

Flow, l/min. (GPM UK)

Couplings	Part No.	Connection	Length	Diameter	Hexagon	Seal
Female thread	105251202	G 1/4"	60	26	21	NBR
	105251212	G 1/4"	60	26	21	FPM

Couplings without valve	Part No.	Connection	Length	Diameter	Hexagon	Seal
Female thread	105250202	G 1/4"	60	26	21	NBR

Nipples	Part No.	Connection	Length	Diameter	Hexagon	Seal
Female thread	105256202	G 1/4"	48.2	21	19	NBR
	105256212	G 1/4"	48.2	21	19	FPM

Nipples without valve	Part No.	Connection	Length	Diameter	Hexagon	Seal
Female thread	105255202	G 1/4"	48.2	21	19	-

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

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Series 525, DN6.3

Hydraulic Products

Nordic Range / 525 - High Performance Poppet Type Couplings

Series 525, DN6.3

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Category	Class	Connection	Article Nr	Model Files (.stp)	Drawing Files (.pdf)
Couplings	Female thread	G 1/4"	105251202
Nipples	Female thread	G 1/4"	105256202