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

Contact Hy-Lok Distribution today to discuss your application needs.


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)
  • Many More...


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
  • And More...


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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