8 Different Types of Hydraulic Fittings

8 Different Types of Hydraulic Fittings

Imagine a complex machine that relies on a lifeblood to function. In hydraulic systems, this lifeblood is pressurized fluid, and its smooth flow depends on a critical component and that is fittings. These connectors ensure a secure and leak-free passage for the fluid, keeping the machine running smoothly. 

The global hydraulic fittings market is projected to reach a staggering U.S. $2110.1 million by 2029, according to Valuates Reports' Global Hydraulic Fittings Market Research Report 2023 With such a growing market, understanding the different fitting types becomes even more important. 

This simplifies that process by introducing eight essential hydraulic fitting categories, their functionalities, and suitable applications. By recognizing the right fitting type, you can streamline your projects, prevent delays, and ensure efficient system maintenance.

1. Face Seal Fittings

Face seal fittings are otherwise known as ORFS (O-ring face seal) fittings, which are hydraulic systems connections meant to ensure that there is no leakage in any project they are used on especially if it involves high pressure situations. These fittings have an O ring groove on their straight thread nose section creating this secure and strong bond when they come together.

Face Seal Fittings

The main components of the ORFS fitting are

  • The O-ring: Made of elastomeric materials, this part ensures a leak-proof seal.

  • The Flat Face: This surface is where the O-ring seals, forming a tight connection.

  • The Thread: Unlike tapered threads that seal through the threads, ORFS uses straight thread solely for joining.

2. Flange Fittings

These fittings are called flange hydraulic fittings because they have one or two flanges on their ends. It is a fastening method that connects pipes, valves, pumps and other machinery to create a piping system. Generally, the tight seal in flanged fittings are created by bolting them together, which requires the use of gaskets.

Other methods, such as welding and fusion bonding, can also be used, depending on the application and pressure rating needed for easy disassembly.

Flange Fittings

Flanged fittings are used in various industries, including:

  • Oil and Gas: Provide secure, leak-proof joints for maintaining system integrity under high-pressure pipelines.

  • Chemical Processing: Ensure tight seals, ideal for systems handling corrosive and hazardous chemicals. Preventing leaks that could cause environmental or workplace hazards.

  • Power Generation: They are suitable for frequent maintenance and inspection due to their ease of disassembly and reliability in handling high-pressure steam and liquids.

3. Flare Fittings

Metal Fittings typically use flare fittings for compressing them; usually such are made of aluminium, copper or soft steel, but other metals may be employed too. During assembly of a flare fitting, it seals the flared end of tubing to a fitted component also having a taper to form a leak-proof seal under high pressure.

Flare adapters provide significant long-term reliability, making them suitable for mission-critical situations and use in relatively inaccessible locations.

Flare Fittings

Uses of Flared Fittings

  • Construction and Shipbuilding Industries

  • Air Conditioning and Electrical Industries

  • Chemical and Fertilizer Industries

  • Aerospace and Military Applications

  • Hydraulic System Applications

4. Hydraulic DIN Fittings

German Industrial Standard (DIN) fittings are used in hydraulic systems to join together hoses, tubes and pipes without any leakage in applications involving high pressure. Such joints were created by Deutsches Institut für Normung so as to provide secure connections with no leaks.

Every fitting consists of three sections that includes tapered threaded fitting body, nut containing straight thread suitable for pair with the body thread and sleeve with the tapered thread perfectly mating the body one.

Hydraulic DIN Fittings

Advantages of DIN Fittings

  • Resistant to high pressure

  • Provides a secure and leak-proof connection

  • Simple to install and remove

  • Durable and long-lasting

  • Versatile for use in various applications

Disadvantages of DIN Fittings

  • Higher cost compared to other fittings

  • Installation requires specialized tools

5. Brass Fittings

Brass fittings are tough fittings made of brass, which are used in joining two pieces of plumbing. They have different types such as couplings, elbows, tees and caps.
Brass fittings are commonly used in water systems because they are immune to rusting and corrosion. Also, they can be easily soldered hence preferred where metallic pipes are being joined.

Brass Fittings

From their first use in plumbing during the 1700s until now, several reasons make brass fittings better than others:

  • Strength: With its resistance to corroding and rusting, which makes it last long.

  • Health: It retards bacteria growth making it ideal for potable water systems.

  • Easy of Operation: Most pipe applications can be accommodated using brass fittings without leading to any complexities during installation.

  • Inexpensive: Brass is a cheap material that can be relied on when designing plumbing systems.

  • Dependability: Brass fittings are known for their high level performance hence offering many years of hassle free service if the correct hydraulic hose fitting is fitted properly according to the manufacturer’s instructions.

6. PTFE Hose Fitting

PTFE Hose Fitting

Polytetrafluoroethylene, popularly known as PTFE, was accidentally discovered by chemist Roy J Plunkett. The discovery was an accidental byproduct of another experiment done by DuPont. In 1941, DuPont patented PTFE. It has the lowest dynamic and static coefficients among all materials, thus making it the slipperiest substance on Earth.

PTFE hoses are utilized for applications involving bleach, chlorine, bromine, steam, acids, compressed natural gas (CNG), natural gas, ethanol, transmission fluid, brake fluid, antifreeze, oil transfer, pump hoses and connectors, solvents, paint, alcohol, and pharmaceuticals.

  • High Sanitary Standards: Made of high-purity materials, thus reducing the risk of contamination.

  • Sterilization Compatibility: These can withstand different temperature extremes and also suitable for heating, cooling, or steam sterilizing purposes.

  • Fuel and Lubricant Compatibility: It is chemically stable and inert to various fuels and lubricants hence preventing its degradation over time.

  • Low Friction and High Flow Rate: A low friction coefficient ensures smooth hydraulic fluid flow, reducing pressure drops and enhancing efficiency.

7. Steel Hydraulic Fittings

Steel is the best material for hydraulic hose fittings as it is strong, stiffy, pliable, durable. The range of temperatures in which steel does not break down is from – 65°F to 500°F. For hydraulic applications stainless steel hose fittings are preferred since they last long.

Though more expensive than other materials stainless steel hydraulic fittings are also the most dependable ones. Stainless steel is ideal for highly corrosive environments where it can take pressures up to 10,000 PSI or even up to 20,000 PSI with special designs.

The ability of stainless steel fittings to withstand various temperatures, combined with appropriate hose selection and protection, enables their use in various industries and applications. 

Steel Hydraulic Fittings

These include, but are not limited to:

  • Oil & gas

  • Hose Manufacturing

  • Locomotive industry

  • Metalworking, such as forging

  • Food processing

  • Construction

  • Marine sector

  • Pharmaceutical Manufacturing

8. BSP Fittings

Stainless Steel BSP Fittings connect hydraulic hoses and seal pipes and fittings by joining an external (male fittings) thread with an internal (female fittings) thread. These fittings come in two types: BSPP and BSPT threads. Like other threaded fittings, they typically come in sizes below 4 inches and have pressure ratings available in Class 2000lb, 3000lb, and 6000lb

BSP Fittings

Five Characteristics of Stainless Steel BSP Fittings:

  • Corrosion Resistance: Stainless steel fittings are known for their ability to withstand corrosion and extreme temperatures, making them ideal for use in corrosive environments.

  • Appearance: Exposed stainless steel threaded fittings are naturally shiny and elegant, making them suitable for commercial establishments.

  • Easy Installation: No beveling preparation is required for installation. Simply screw the pipes into the fittings since they are lightweight. However, ensure that the threads match to prevent gas leakage.

  • Low Cost: Stainless steel pipe fittings are cost-effective and durable. Due to their small size and corrosion-resistant properties, they last for many years without requiring frequent replacement.

  • High Strength: Stainless steel fittings have higher tensile strength than mild steel, with duplex stainless steel having even higher tensile strength than austenitic steel.

Where to Buy Hydraulic Fittings

If you need hydraulic fittings and other materials like adapters, bite-to-wire fittings, compression fittings, hose and tubing, quick couplers, and gauges, you'll find them at Hydraulic Warehouse. 

We offer a wide selection of high-quality products and exceptional customer service to ensure your hydraulic system operates smoothly and efficiently. Check our range of products here and get quality and discounts on selected items.

Final Thoughts

Choosing the right hydraulic fitting is essential for your hydraulic system's safe and efficient operation, ensuring minimal downtime and maximum productivity. Key factors when selecting hydraulic fittings the appropriate hydraulic hose fitting include size, material, temperature range, and pressure requirements.

Additionally, assess the specific application and the fitting's intended function. If frequent assembly and disassembly are necessary, opt for fittings that are easy to assemble and disassemble.

Key Takeaways: 

  • Functional Diversity: Hydraulic fitting are vital for connecting components in hydraulic systems, and each type serves a specific purpose. Choosing the right fitting is essential for optimal performance.

  • Application Versatility: Different industries benefit from specialized fittings tailored to their needs, ensuring system integrity and reliability in diverse environments.

  • Accessible Quality: Hydraulic Warehouse offers high-quality fittings and materials, ensuring efficient operation. Explore our products for quality assurance and discounts.

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