FFS Series

Stainless steel flat face couplers made to the ISO 16028 Standard dimensions

AKJia’s FFS Series stainless steel flat face couplers incorporate all the benefits of the carbon steel FF Series couplers while perfectly suited for corrosive fluids and environments. 


  • AISI 304 Stainless Steel, also available 316 stainless steel
  • Fitted with Viton seals – FKM(Other seals available on request)
  • Also available in carbon steel (See FF Series)
Datasheet Inquiry
FFS Series Flat Face Stainless Steel Quick Couplings


  • Safety locking sleeve fitted as standard to prevent accidental disconnection
  • Flat faces are easily wiped clean
  • Allows for minimal inclusion of air and contaminents during connection
  • Flat face design prevents fluid loss during disconnection
  • Bidirectional flow


  • Corrosive fluids and environments
  • Marine
  • Oil and gas
  • Chemical
  • Pharmaceutical
  • Nuclear
FF Series Dimensions Flat face quick couplings


The FFS Series dimensional conforms to the ISO 16028 Standard, ISO16028 specifies the size requirements for the connection part of the flat face quick disconnect coupling. All quick couplings that meet this standard can be interchangeable with each other. Users can choose between different brands of quick couplings, which can be interchangeable with each other at half-to-half.

ISO 16028 -2023

Available Seals and Temperature Range

All carbon steel products have Nitrile Butadiene Rubber (NBR) seals fitted as standard. All stainless steel products have Fluoro-elastomer Rubber (Viton®) (FKM) seals fitted as standard. Special seal materials are available on request.

Abbreviation Trade Name Chemical Name Min. Temp Max. Temp
NBR, XNBR Chemigum®,  Hycar8,  Breon®,  Butakon®, Butacril®, Buna-N®, Perbunan®, Paracril®, Krynac®, Europrene-N®, Nipol® Nitrile Butadiene Rubber
Carboxylated Nitrile Rubber
-40ºC (-40ºF) 106ºC (223ºF)
FKM(FPM) Dai-el®, Fluorel®, Tecnoflon®, Viton® Fluoro-elastomer Rubber -20ºC (-4ºF) 200ºC (392ºF)
EPR, EPDM Buna-AP®, Dufral®, Epsyn®, Nordel®, Epcar8, Keltan®, Royalene®, Polysar-EPDM® Ethylene Propylene Copolymer
Ethylene Propylene Terpolymer
-50ºC (-58ºF) 120ºC (248ºF)
FVMQ Silastic 1S®, FSE® Fluorosilicone Rubber -65ºC (-85ºF) 170ºC (338ºF)
FFKM Perlast®, Kalrez®, Chemraz®, Kaflon® Perfluoroelastomer -25ºC (-13ºF) 300ºC (572ºF)