LET-LOK® Compression Tube Fittings

by UCT Fluid Solutions

  • The LET-LOK® tube fitting is a mechanism used both to seal and to grip tubing.
  • Features a variety of configurations and sizes to provide an optimal solution for customer needs.
  • Sizes range from 1/16” to 2”
  • Temperatures range -194°C to 538°C (-317°F to 1000°F)
  • Type test approved by TUV, ASTM F1387-99, ABS, CRN, APRAGAS, Lloyd’s, DNV.
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LET-LOK® Compression Tube Fittings

  • LET-LOK® tube fittings have been carefully manufactured to withstand the persistent demands for high-performance fluid system. Each one has passed a stringent tolerance test for high pressure, impulse, vibration, vacuum and temperature.
  • These precision-machined fittings are manufactured to exacting standards, employing the most state-of-the-art computerized automation.
  • All LET-LOK® fittings are backed by HAM-LET’s commitment to the highest quality-control standards and skilled craftsmanship.
  • The LET-LOK® tube fitting was designed for applications were high reliability and quality is required. Customized for use in various instrumentation processes in industries such as chemical, petroleum, power generation and more.

Key features

  • Let-Lok® design creates a tight metal to metal sealing, thus allowing to hold pressure more then 4XMAWP (validated by burst testing) at a wide range of temperatures, same for high number of temperature cycles and make-remake cycles.
  • Manufactured to the highest standards, products undergo helium leak tests to meet industry highest standards.
  • Various configurations are available: straight, elbow, angled, tee, cross, plugs, caps, unions and various couplings.
  • End connections include NPT, ISO, BSPP, BSPT, SAE/ME.
  • Sizes available both in inch (1/16” to 2”) and mm (2 – 50 mm).
  • Quick and easy installation, does not require special tools.
  • Materials:
    • Standard straight fittings: SS 316L in accordance with ASTM A479, ASTM A276 and DIN EN10272.
    • Standard steel shaped fittings: SS 316L in accordance with ASTM A182 and DIN EN10122-5.
    • Heat code traceable 316 stainless steel for bodies, ECE R110 or EC 79 approved materials for O-Rings. LET LOK series’ other materials include brass, alloy 400 nickel-copper, hastelloy C®, alloy 825, alloy 254, super duplex 2507 just to name a few.
    • EC 79 certified for several configurations for sizes 1/8” to 3/4” (6mm to 16mm), pressure up to 350 bar, and temperatures -40°C to +120°C.

Application areas

  • On-board vehicles
  • Hydrogen service
  • Instrumentation Hook-Up systems and sensing lines
  • Hydrogen production facilities
  • Hydrogen storage and delivery systems
  • Analytical installations

Contact us

  • Please see the technical datasheet under downloads for mounting and connector configuration of LET-LOK® compression tube fittings. Fill out the contact vendor form to contact us today.
Max Ambient Temperature (in °C)

Min Ambient Temperature (in °C)

Compliant with

Manufacturing Readiness (MRL)

Technology Readiness (TRL)

LET-LOK® Compression Tube Fittings Catalogue

Product catalogue

LET-LOK® Compression Tube Fittings declaration tests finished

Finished test declaration

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      UCT Fluid Solutions

      UCT Fluid Solutions is a key global manufacturer and supplier of high-performance industrial flow control systems. Our broad portfolio covers the various needs of the hydrogen industry across industrial and automotive sectors, with dedicated valves, fittings, hoses, and custom solutions.

      Our Ball valves, Needle valves, and Manifolds series are certified to ISO 15848-1, ensuring the lowest fugitive emissions rates and maximum safety for hydrogen handling.

      Our Tube and Pipe fittings are EC79 certified for onboard vehicles, and undergo annual rigorous helium testing by a 3rd party lab to ensure our customers that we keep meeting the highest industry standards.

      Encouraging innovation and creativity, UCT Fluid Solutions have developed patented products and simplified engineered solutions to accommodate our customers’ demands.

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