Hy-Lok USA, Inc. tube and pipe fittings provide leak-free connections for instrumentation, pneumatics, hydraulics, fluid delivery systems and other related industries.

With over 30 years’ experience providing fitting solutions for a wide variety of applications, our products are guaranteed to be dependable and help you achieve the highest degree of efficiency.

Each of the fitting types provided by Hy-Lok is tailored to the exact requirements of your application. Our large inventory of JIC flare fittings, weld fittings, calibration, high pressure cone and thread fittings are all thoroughly tested for maximum quality control before it reaches our customers.





Hy-Lok tube and pipe fittings provide leak-free connections for instrumentation, hydraulics, fluid delivery systems, and other related industries.

Hy-Lok Tube Fittings

Hy-Lok’s flareless tube fittings feature a two-ferrule design that compensates for tolerances in tube O.D. and range in tube size from 1/16″ to 2″ (2mm to 38mm).

  • Tube to Tube Union
  • Tube to Male Pipe
  • Stub Tube Connector
  • Tube to An Tube
  • Tube To SAE/MS O-Ring
  • Tube To Weld End
  • Plug and Cap
  • Spare Parts


37° Flare JIC

Hy-Lok’s rugged and compactly designed needle valves offer a wide range of sizes, configurations, end connections, pressure and temperature ratings.

  • Union / Union Elbow
  • Union Tee / Union Cross
  • Weld/Female Bulkhead Union
  • Male Run Tee
  • Female Branch Tee
  • O-Ring Seal Run Tee (UNF)


DIN 2353

Hylok DIN 2353 is available in brass, carbon steel, and stainless steel with a size range of 4mm to 42mm combined with a wide selection of configurations.


JIS Bite Type

Hy-Lok single ferrule bite type design is available in many connections and configurations. Standard materials are carbon steel, brass and stainless steel. Sizes range from1/8” thru 2”.


Weld Fittings

Hy-Lok weld fittings range from 1/8” T to 1” T for tube to tube configurations and 1/8” NPT to 1” NPT for tube to male and female pipe configurations

  • Instrument Weld Fittings
  • Micro Weld Fittings


ZCO O-Ring Face Seal Fittings

Made up of three basic components: female nut, gland, and body. The body contains a viton o-ring which is standard. Other o-ring materials are available on request.

  • Nuts
  • Glands
  • Bodies


ZCR Face Seal Fittings

Metal gasket seal meets or exceeds specifications of the semiconductor industry, for tube connections to 1” O.D. Hy-Lok ZCR fittings have been tested to hold and exceed a leak rate of 10-9 torr.

  • Nuts
  • Union, Elbow, Tee, Connectors
  • Swivel Union, Elbow, Tee, Connectors
  • Nut, Cap, Plug & Gasket
  • High – Flow Connections


High Pressure Cone and Thread Fittings

Offering the capability to reach extreme high pressures up to 60,000 PSI, fitting designs include medium and high pressure, with a Sour Gas option.


Instrument Thread NPT Fitting

Hy-Lok precision machined pipe fittings are used for instrumentation and process control. Standard materials are 316 stainless steel, brass and carbon steel. Sizes range from 1/8” thru 2”.

  • Elbow
  • Street Elbow
  • Reducing Street Elbow
  • Male Tee
  • Adapter (Female NPT to male ISO tapered)
  • ISO Parallel Gasket


Calibration Fittings

Hy-Lok calibration fittings allow quick access to various differential pressure (DP) transmitters for calibration. Standard body material is 316 stainless steel, available in 1/4″ or 5/16″ dimensions.





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