Hydraulic Products, X66 Range - ISO 16028 Flat-Face Stainless Steel

Series 566, DN12.5 Stainless Steel

  • Flat-Face design
  • Stainless steel design
  • One-hand operated

CEJN Series 566 is a Flat-Face quick-connect coupling dimensionally in accordance to ISO 16028 Standard for low- and medium-pressure hydraulic applications. The Flat-Face design minimizes spillage during connection and disconnection. The stainless steel design makes it extra sturdy to fit applications in extreme environments. Series 566 couplings require only one hand for operation, making connection and disconnection fast and easy. Dust caps are available as accessories for both the coupling and nipple to prevent dust and debris from entering the system. Series 566 couplings also feature manual security locking as added protection against involuntary disconnection.


The couplings and nipples are also available in three larger sizes; DN 6.3 (Series 266), DN 10 (Series 366), DN 19 (Series 766). For a steel version see Series 565. Nipples with pressure eliminator available under Series 564.

Series 566, DN12.5 Stainless Steel
Technical data
Temperature range: -20°C — +205°C (-4°F — +401°F)
Material coupling: Stainless steel, AISI 316
Material nipple: Stainless steel, AISI 316
Material seal: Viton (FPM), other sealing materials on request
Connectability: Without pressure
Disconnection under pressure: Not allowed
Max. working pressure connected: 250 bar (3625 PSI)
Max. working pressure disconnected: 250 bar (3625 PSI)
Min. burst pressure connected: 1000 bar (14503 PSI)
Min. burst pressure disconnected: 1000 bar (14503 PSI)

Rated flow is measured at 0.1 MPa pressure drop.

Pressure drop chart
Pressure drop, MPa
Series 566, DN12.5 Stainless Steel
Flow, l/min. (GPM UK)
Couplings Part No. Connection Length Diameter Hexagon Seal
Female thread 10 566 1215105661215G 1/2" (BSP)74.838.232FPM
 10 566 1217105661217G 3/4" (BSP)76.338.233FPM
 10 566 14151056614151/2" NPT--32FPM


Nipples Part No. Connection Length Diameter Hexagon Seal
Female thread 10 566 6215105666215G 1/2" (BSP)71.435.732FPM
 10 566 6217105666217G 3/4" (BSP)72.936.733FPM
 10 566 64151056664151/2" NPT--32FPM


Check with an authorized CEJN distributor for availability and prices. Other connections and sealing material on request. Some part numbers may be subject to minimum order quantities. CEJN reserves the right to make changes without further notification. Thread connections are listed according to ISO Standards. All measurements are in mm.

Please complete the form below in order to gain access to downloadable product files. The data you provide is for internal information purposes only and will not be published or made available outside of CEJN.

Available files for download