Fittings

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. Common applications include pharmaceuticallife support, and oil & gas.

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.

For more information on Hy-Lok tube and pipe fittings, we encourage you to explore our catalog. To discuss your specific application needs, locate your local Hy-Lok distributor.

Applications of Tube and Pipe Fittings

Hy-Lok tube and pipe fittings are designed to deliver secure, leak-free connections across a wide range of fluid and gas systems. Proper fitting selection is critical to maintaining system integrity, preventing leaks, and ensuring long-term operational efficiency.

Common applications include:

  • Instrumentation systems requiring precise and reliable connections
  • Hydraulic and pneumatic systems operating under pressure
  • Fluid and gas delivery systems in industrial environments
  • Oil and gas processing and distribution systems
  • Pharmaceutical and life sciences applications requiring high purity
  • Calibration systems and testing environments

These fittings are engineered to perform consistently in both standard and high-pressure applications, making them suitable for critical and non-critical systems alike.

 

FAQs

What are tube and pipe fittings used for?

Tube and pipe fittings are mechanical components used to connect sections of tubing or piping in fluid and gas systems. They allow engineers to create secure pathways for liquids, gases, or hydraulic fluids while maintaining system pressure and preventing leaks.

These fittings are commonly used in industries such as oil and gas, chemical processing, pharmaceuticals, instrumentation systems, and hydraulic equipment where reliable fluid transfer is essential.


What is the difference between tube fittings and pipe fittings?

Tube fittings are designed specifically for connecting tubing and typically create a seal through compression or ferrule based mechanisms. They are commonly used in precision instrumentation and high purity systems.

Pipe fittings connect threaded pipe components and typically rely on tapered threads or sealing compounds to prevent leaks. They are often used in industrial piping systems for transporting fluids or gases.


How do I choose the right fitting for my application?

Selecting the correct fitting depends on several factors including operating pressure, temperature range, tubing material, and the type of fluid being transported.

Other important considerations include connection standards such as JIC or DIN, sealing method, corrosion resistance, and whether the system requires high purity or clean service fittings.

Working with a knowledgeable distributor or engineering team can help ensure the correct fitting type and material are selected for the application.


What are 37 degree flare JIC fittings used for?

37 degree flare JIC fittings are widely used in hydraulic systems and high pressure fluid transfer applications. These fittings use a flared tubing end that mates with a conical seat to create a metal to metal seal.

They are commonly found in heavy equipment, aerospace systems, industrial hydraulics, and fluid power applications because of their reliability and resistance to vibration.


What are DIN 2353 tube fittings?

DIN 2353 fittings are compression style fittings designed according to a European standard for hydraulic and fluid power systems. They use a cutting ring design that grips the tube when tightened, creating a strong mechanical and leak tight seal.

These fittings are commonly used in industrial machinery, automation systems, and hydraulic equipment where high pressure performance is required.


What are O Ring Face Seal fittings?

O Ring Face Seal fittings use an elastomeric O ring to create a leak free seal between two flat mating surfaces. This design is particularly effective in high pressure hydraulic systems where vibration and pressure fluctuations can occur.

Because the O ring absorbs movement and prevents metal to metal leakage paths, ORFS fittings are commonly used in mobile equipment, heavy machinery, and fluid power systems.


What are clean fittings used for?

Clean fittings are designed for applications where contamination must be minimized. These fittings are manufactured and handled in ways that reduce particles, oils, and debris that could affect sensitive systems.

They are commonly used in industries such as semiconductor manufacturing, pharmaceuticals, laboratory instrumentation, and high purity gas delivery systems.


 

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. Common applications include pharmaceuticallife support, and oil & gas.

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.

For more information on Hy-Lok tube and pipe fittings, we encourage you to explore our catalog. To discuss your specific application needs, locate your local Hy-Lok distributor.


HAVE A QUESTION?

If you have any questions about any of our products or services, don’t hesitate to give us a call. For any inquiries, fill out the form and one of our Hy-Lok representative will contact you soon.

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