FF90 Series

90-degree flat face couplers made to the ISO 16028 Standard

AKJia’s FF90 Series is designed for use in applications that require a 90° elbow in the hydraulic circuit, such as digger booms. The right-angle design allows for easy mounting without the need for additional fittings, reducing potential leakage paths and cost.


  • Carbon steel with trivalent plating as default
  • Carbon steel with zinc-nickel plating option (1200 hours with no red rust in salt spray tests
  • Fitted with Nitrile seals – NBR (Viton seals – FKM available)
Datasheet Inquiry
FF90 Flat face 90˚ Quick Couplings


  • The FF90 Series is designed to connect with the FF Series flat face couplers
  • 90-degree elbow incorporated into the coupler
  • Flat faces are easily wiped clean
  • Allows for minimal inclusion of air and contaminants during connection
  • Flat face design prevents fluid loss during disconnection
  • Bidirectional flow


  • Hammer circuits
  • High-pressure pulse applications
  • Leak-free environments
  • Construction plant
  • mobile equipment
  • general industrial
  • nuclear
  • Mining and agricultural industries
ff90 dimensions


The 90-degree flat quick connector is designed based on the FF series of flat quick connectors to make it easier to install and use in some special scenarios. Currently there are only 1/2 pieces. Other sizes require custom design. The connection part also complies with ISO16028:2023 standards and can be used with FF series quick connectors

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)