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).

Download drawings/3dmodels

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	105251209	G 1"	92	62	48	NBR
	105251219	G 1"	92	62	48	FPM

Couplings without valve	Part No.	Connection	Length	Diameter	Hexagon	Seal
Female thread	105250209	G 1"	92	62	48	NBR

Couplings with pressure eliminator	Part No.	Connection	Length	Diameter	Hexagon	Seal
Female thread	105251239	G 1"	92	62	48	NBR

Nipples	Part No.	Connection	Length	Diameter	Hexagon	Seal
Female thread	105256209	G 1"	56.5	48	45	NBR
	105256219	G 1"	56.5	48	45	FPM

Nipples without valve	Part No.	Connection	Length	Diameter	Hexagon	Seal
Female thread	105255209	G 1"	56.5	48	45	-

Nipples with pressure eliminator	Part No.	Connection	Length	Diameter	Hexagon	Seal
Female thread	105256239	G 1"	56.5	48	45	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, DN25

Hydraulic Products

Nordic Range Steel Couplings & Nipples

Series 525, DN25

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Category	Class	Connection	Article Nr	Model Files (.stp)	Drawing Files (.pdf)
Couplings	Female thread	G 1"	105251209
Couplings with pressure eliminator	Female thread	G 1"	105251239
Nipples	Female thread	G 1"	105256209
Nipples with pressure eliminator	Female thread	G 1"	105256239