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Four Key Considerations for Hydraulic Hose Fittings

Hydraulic systems, akin to the heart and arteries in heavy machinery and industrial equipment, rely on well-functioning components.

Hydralic Repair Near Me Hydraulic Pumps: The System’s Heart

There are three main types of hydraulic pumps: gear, piston, and vane. Each provides positive displacement of hydraulic fluid, injecting precise amounts of pressurized fluid into the system.

Hydralic Repair Near Me Hydraulic Hoses and Fittings: The Arteries

Essential for the integrity of the Hydralic Repair Near Me hydraulic system, the correct hose and fitting choice prevents leaks, failures, or bursts. Handling medium to high pressures, these components must be carefully selected to manage the system’s power and avoid catastrophic failures.

I. Hose Fittings & Ferrules: One-Piece vs. Two-Piece

  • One-Piece Hose Fittings: Feature a pre-crimped ferrule, ensuring alignment and proper matching with the fitting. They are ideal for basic applications and quick assembly.
  • Two-Piece Hose Fittings: Offer greater flexibility in hose selection, accommodating various types like 1SN, 2SN, and multi-spiral hoses. Particularly suited for critical high-pressure applications, they can handle extreme vibration and pressure surges.

Cost Advantage for Distributors: Two-piece stainless steel fittings can reduce inventory costs, requiring fewer hose tail types (standard and interlock) and a wider variety of compatible ferrules.

II. Fitting & Hose Compatibility

The weakest point in a Hydralic Repair Near Me hydraulic system can often be the fitting connection area. Ensuring that the fitting and hose have matching pressure ratings is critical to prevent leaks or blow-offs. A low-pressure fitting should never be paired with a high-pressure hose, as it can lead to catastrophic failures.

III. Assembly Process: Skiving vs. Non-Skiving

  • Skiving: Involves removing a layer from the hose’s OD and ID to ensure a metal-to-metal connection, crucial for medium to high-pressure applications. It allows the ferrule to bite into the hose’s wire braiding.
  • Non-Skiving: Designed for ready assembly without material removal. However, it may compromise the connection’s reliability as the ferrule bites into the hose cover.

IV. Fitting Material

Choosing the right material for fittings is vital for Hydralic Repair Near Me system integrity.

  • Stainless Steel: Best for corrosive environments and high acid exposure.
  • Brass: Suitable for lower pressure applications with a maximum temperature of 400° F.
  • Carbon Steel: Common in agriculture, industrial, and construction applications but less corrosion-resistant.
  • Aluminum: Used for its lightweight properties, though not common in hose fittings.


The design of a hydraulic system must consider the working pressure required by the application. Selecting the right components ensures the system’s safe and efficient operation, factoring in hose and fitting compatibility, fitting design, and assembly method.

JIC (Joint Industries Council) and AN (Air Force – Navy Aeronautical Design Standards) fittings, though similar in appearance and function with their 37° flare connections and straight threads on both male and female sides, have distinct uses and specifications. Both types create a seal by mating the JIC male flared connection with the female coned connection. Originating during World War II for U.S. military aviation applications, AN fittings are part of the Army-Navy standards. On the other hand, JIC fittings, commonly known as SAE J514 Flare fittings, are predominantly used in industries like agriculture. This overview examines the key differences between JIC and AN fittings, aiding in the selection of the most suitable fittings for specific applications.

AN (Army-Navy) fittings, as per the MIL-F-5509 and AS4841 standards, are specific types of fittings designed for connecting flexible hoses and rigid metal tubing in fluid systems. Originating from World War II, this US military specification emerged from a joint Army and Navy standard, which is also the source of the traditional red/blue color scheme seen in their anodized finishes.

AN fittings are categorized in sizes ranging from -2 to -32, increasing in irregular steps that represent the tubing’s outside diameter in 1/16-inch increments. For instance, a -8 AN size corresponds to a 1/2-inch OD tube. This sizing method does not account for the inside diameter (ID) of the tubing, as the wall thickness can vary. Each size has a corresponding standard thread size.

These Hydralic Repair Near Me fittings are characterized by a 37° flared tubing design for a metal-to-metal seal. While similar to other 37° flared fittings like the JIC, AN fittings have specific thread class and shape standards and use different metals, making them more precise for aerospace applications. Despite being theoretically interchangeable with JIC fittings, such interchange is generally not advised due to these stringent specifications.

On the other hand, JIC (Joint Industry Council) fittings, governed by the SAE J514 and MIL-DTL-18866 standards, are also 37-degree flare fittings widely utilized in high-pressure applications like fuel delivery and fluid power, supporting pressures up to 10,000 psi. JIC fittings, dimensionally identical to AN fittings, are manufactured to less stringent tolerances and are more cost-effective. Although they share similarities with AN fittings, the latter are made to higher standards, making them more precise and expensive. Hence, using AN and JIC fittings interchangeably is typically discouraged.

History and Development

The concept of a 37° flare fitting originated before the establishment of the JIC standard (SAE J514). Initially designed with high precision for the US Army and Navy during World War II, these fittings were known as AN (Army Navy) fittings and were renowned for their performance in automotive and aerospace applications.

Their reputation was so esteemed that post-war, numerous companies tried to replicate these flare-style fittings, leading to a variety of products with inconsistent compatibility. In response, the Joint Industry Council (JIC) was formed in 1950 to create a uniform standard. Collaborating with a committee of engineers from the Society for Automotive Engineers (SAE), they developed a standard, maintaining the AN fittings’ quality but with a more accessible thread class (JIC – 2A/2B vs AN – 3A/3B), facilitating easier and more economical manufacturing.

Applications of JIC Fittings

Originally, 37-degree fittings were utilized in fuel, oil, and hydraulic systems. Today, their use extends to various industries, including water treatment, carwash, and chemical transfer systems.

Compatibility of JIC and AN Fittings

AN fittings are manufactured to extremely precise tolerances, while JIC standards are more relaxed to reduce manufacturing complexities and costs. Consequently, using JIC fittings in systems designed