HQ Series

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Flat face couplings made to the ISO 16028 Standard

Construction ApplicationsIndustrial ApplicationsForestry Applications

The HQ Series flat face couplings are Holmbury’s flagship products, known globally for their leak free performance in high pressure pulse, hammer circuits and many other applications.  The preferred choice for many global OEMs.
Min Spill TechMin Spill
Carbon Steel Zinc Nickel Materials ISO 16028 Flat Faced Couplings ISO Standard
Flat Face CouplingsHQ

Features

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

Accessories

  • Dust Cap are available for the HQ Series

Construction

  • Carbon steel with zinc nickel plating (1200 hours with no red rust in salt spray tests)
  • Fitted with Nitrile seals (Viton seals available)
  • Also available in AISI 316 stainless steel (See HSS Series)

Applications

  • High pressure pulse applications
  • Leak free environments
  • Construction plant
  • Mobile equipment,
  • General industrial
  • Agricultural 
  • Skid steer loaders

AVAILABLE SEALS AND TEMPERATURE RANGE

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

0°

106°C 223°F

Nitrile

120°C 248°F

EPDM

200°C 392°F

Viton®

300°C 572°F

Kalrez®

0°

-20°C -4°F

Viton®

-25°C -13°F

Kalrez®

-40°C -40°F

Nitrile

-50°C -58°F

EPDM

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 -40°C (-40°F) 106°C (223°F)
FKM (FPM) Dai-el®, Fluorel®, Tecnoflon®, Viton® Fluoro-elastomer Rubber -20°C (-4°F) 200°C (392°F)
EPR EPDM Buna-AP®, Dufral®, Epsyn®, Nordel®, Epcar8, Keltan®, Royalene®, Polysar-EPDM® Ethylene Propylene Copolymer Ethylene Propylene Terpolymer -50°C (-58°F) 120°C (248°F)
FVMQ Silastic 1S®, FSE® Fluorosilicone Rubber -65°C (-85°F) 170°C (338°F)
FFKM Perlast®, Kalrez®, Chemraz®, Kaflon® Perfluoroelastomer -25°C (-13°F) 300°C (572°F)