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, 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).

Download drawings/3dmodels

Technical data
Nominal flow diameter:	1/4" (6.3 mm)
Rated flow:	7.7 GPM (29 l/min)
Max. working pressure connected:	6530 PSI (450 bar)
Max. working pressure disconnected:	4350 PSI (300 bar)
Min. burst pressure connected:	26110 PSI (1800 bar)
Min. burst pressure disconnected:	17400 PSI (1200 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:	Without pressure
Disconnection under pressure:	Not allowed

Rated flow 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	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.

Please fill in form below. * = Required
Name*
Country*
Company
Address
Fax
Phone
E-mail*

Series 525, DN 6.3

Hydraulic Products

Nordic Range Steel Couplings & Nipples

Series 525, DN 6.3

GLOBAL

NORTH AMERICA

SOUTH AMERICA

ASIA PACIFIC

EUROPE

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