Fluid Products, Classic Couplings & nipples

Series 321

  • One-hand operated
  • Extremely high-flow capacity
  • Large range of connections


Featuring valved couplings and valveless nipples, Series 321 has superior flow capacity. Series 321 is suitable for a variety of fluid applications, such as water inlet and return for injection molding lines. A large range of connections is available in the series that requires only one hand for operation. Other sealing materials, such as EPDM, are availabe on request.


Series 321
Couplings with valve Part No. Connection Seal Length Diameter Hexagon
Hose connection 10 321 1002 1032110026.3 mm (1/4")NBR6723.419
 10 321 1003 1032110038.0 mm (5/16")NBR69.523.419
 10 321 1004 10321100410.0 mm (3/8")NBR7023.419
 10 321 1005 10321100513.0 mm (1/2")NBR6823.419
Male thread 10 321 1152 103211152R 1/4"NBR6323.420
 10 321 1154 103211154R 3/8"NBR6123.420
 10 321 1155 103211155R 1/2"NBR55.525.422
 10 321 1254 103211254G 3/8"NBR56.523.420
Female thread 10 321 1202 103211202G 1/4"NBR5723.420
 10 321 1204 103211204G 3/8"NBR6025.420
 10 321 1205 103211205G 1/2"NBR59.528.925


Nipples without valve Part No. Connection Seal Length Diameter Hexagon
Hose connection 10 321 5003 1032150038.0 mm (5/16")-44.513-
 10 321 5004 10321500410.0 mm (3/8")-44.513-
 10 321 5005 10321500513.0 mm (1/2")-44.517-
Male thread 10 321 5151 103215151R 1/8"-351513
 10 321 5152 103215152R 1/4"-38.516.214
 10 321 5154 103215154R 3/8"-40.519.617
 10 321 5155 103215155R 1/2"-4725.422
Female thread 10 321 5202 103215202G 1/4"-3619.617
 10 321 5204 103215204G 3/8"-37.523.120


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.
Technical data
Nominal flow diameter: 7.4 mm (9/32")
Water flow (single shut-off): 78 l/min (17.2 GPM UK)
Max. working pressure: 35 bar (507 PSI)
Min. burst pressure: 140 bar (2030 PSI)
Temperature range: -20°C — +100°C (-4°F — +212°F)
Material coupling: Nickel-plated brass
Material nipple: Nickel-plated brass
Cv (single shut-off): 2.72
Kv (single shut-off): 2.34
Fluid flow
Pressure drop, bar (PSI) Series 321 Flow, l/min. (GPM UK)

Available files for download

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.