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 zinc-passivated steel 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).

Download drawings/3dmodels

Technical data
Nominal flow diameter:	20 mm (3/4")
Rated flow:	250 l/min (55.0 GPM UK)
Max. working pressure connected:	28.0 MPa
Max. working pressure disconnected:	20.0 MPa
Min. burst pressure connected:	100.0 MPa
Min. burst pressure disconnected:	80.0 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:	Part under pressure equipped with eliminator, other part free to drain.
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	105251207	G 3/4"	76.2	52	38	NBR
	105251217	G 3/4"	76.2	52	38	FPM

Couplings without valve	Part No.	Connection	Length	Diameter	Hexagon	Seal
Female thread	105250207	G 3/4"	76.2	52	38	NBR

Couplings with pressure eliminator	Part No.	Connection	Length	Diameter	Hexagon	Seal
Female thread	105251237	G 3/4"	76.2	52	38	NBR

Nipples	Part No.	Connection	Length	Diameter	Hexagon	Seal
Female thread	105256207	G 3/4"	47	39	36	NBR
	105256217	G 3/4"	47	39	36	FPM

Nipples without valve	Part No.	Connection	Length	Diameter	Hexagon	Seal
Female thread	105255207	G 3/4"	47	39	36	-

Nipples with pressure eliminator	Part No.	Connection	Length	Diameter	Hexagon	Seal
Female thread	105256237	G 3/4"	47	39	36	NBR

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, DN20

Hydraulic Products

Nordic Range / 525 - High Performance Poppet Type Couplings

Series 525, DN20

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Category	Class	Connection	Article Nr	Model Files (.stp)	Drawing Files (.pdf)
Couplings	Female thread	G 3/4"	105251207
Couplings with pressure eliminator	Female thread	G 3/4"	105251237
Nipples	Female thread	G 3/4"	105256207
Nipples with pressure eliminator	Female thread	G 3/4"	105256237