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Tube Fittings-Thermocouple Connector


Hikelok tube fittings are available in a variety of materials, including optimized 316 stainless steel chemistry with elevated nickel, chromium, and other elements for superior corrosionresistance in a variety of applications, including chemical processing, sour gas and subsea systems. Hikelok continues to improve the performance and reliability of the tube fitting for use in thousands of diverse applications—including research, alternative fuels, analytical and process instrumentation, oil and gas, power, petrochemical, and semiconductor industries.


  • Twin ferrule fittings provide metal-to-metal seal connections, non-elastomeric seals for leak-free connections

  • Hikelok twin ferrule fittings are designed to have a maximum allowable working pressure that is higher than that of any tubing

  • Industry standard design for all instrumentation grade tubing

  • Stainless steel tube harderness: the hardness of the tube shall be not greater than 85 HRB

  • Available in sizes from 1/16 to 2in and 2 mm to 50 mm

  • Hikelok fittings materials include 316 stainless steel, steel, brass, aluminum, nickel-copper, Hastelloy C, 6Mo, Incoloy 625 and 825

  • Hikelok special treated back ferrule is to provide secure

  • Silver coated threads to reduce galling

  • Leak-proof joints capable of satisfying high pressure vacuum and vibration applications


  • Hydraulic proof pressure test (1.5 times the maximum permissible working pressure): no leakage

  • Dismantling and reassembly test (dismantle 10 times): no leakage

  • Minimum hydrostatic pressure test (4 times the maximum permissible ambient pressure rating): no leakage

  • Vacuum test (1 x 10-4 mbar or greater): the leak rate less than 1 x 10-8

  • Proven design, manufacturing excellence, and superior raw materials combine to ensure that every Hikelok fitting meets our customers’ highest expectations

  • Hikelok tube fittings deliver a leak-tight, gas-tight seal in an easy-to-install, disassemble, and reassemble form

More Options

  • Optional Instrumentation Pipe Fittings

  • Optional Instrumentation Weld Fittings

  • Optional O-Ring Face Seal Fittings

  • Optional Miniature Butt-Weld Fittings

  • Optional Long Arm Butt-Weld Fittings

  • Optional Automatic Tube Butt Weld Fittings

  • Optional Metal Gasket Face Seal Fittings

  • Optional Vacuum Fittings

  • Optional Vacuum Adapter Fittings

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