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Hydraulic Hose Flange Fitting: Secure Connections for Peak Performance

Kingdaflex: Your One-Stop Shop for High-Quality Hydraulic Hose Flange Fittings. Secure, reliable connections for optimal hydraulic system performance. Get a quote today!

hydraulic hose flange fitting

Kingdaflex, we are a Reliable Hydraulic Flange Fitting Manufacturer. Get high-quality, cost-effective flange fittings for secure connections in your hydraulic systems.

Hydraulic Hose Flange Fitting Material Selection:

Base Metal: Choose from various materials like steel (different grades for pressure and temperature resistance), stainless steel (corrosion resistance), or even brass (for lower pressure applications).

Hydraulic Hose Flange Fitting Sealing Options

  • O-Ring Material: Pick an O-ring material compatible with your fluid type and operating temperature for optimal sealing performance. Consider materials like Nitrile, Viton, or PTFE.
  • Sealing Configuration: Decide on the sealing configuration within the flange, such as a single O-ring or a double O-ring design for added security in high-pressure applications.

Hydraulic Hose Flange Fitting Design

  • Flange Type: Select between common flange types like SAE J518 (4-bolt flange), SAE 61 (split flange), or custom designs for specific applications and space constraints.
  • Port Size and Thread: Specify the port size (diameter) and thread type (e.g., NPT, BSP) to match the hoses and components you’re connecting.

Hydraulic Hose Flange Fitting Surface Treatment

  • Plating: For additional corrosion resistance or improved appearance, consider plating options like zinc plating or nickel plating.
  • Paint or Coating: Choose a paint or coating that offers protection against environmental factors or specific chemical exposure relevant to your application.

hydraulic hose flange fitting types

sae j518 code 61 and 62 flanges​

SAE J518 Code 61 and 62 Flanges

Also known as 4-bolt flanges. Most popular type due to their versatility and secure bolting pattern.

Available in two pressure ratings:

  • Code 61 (lower pressure): Thinner flange profile for tighter spaces.
  • Code 62 (high pressure): Thicker flange profile for higher pressure applications.
sae split flange

SAE Split Flange

  • Two halves clamp together around the hose flange for easy installation and removal.
  • Often used in applications requiring frequent disassembly or limited access for tightening bolts on a traditional flange.
  • Available in both Code 61 and 62 pressure ratings.
caterpillar flange​

Caterpillar Flange

Similar to a high-pressure Code 62 flange but with a thicker flange body for added strength. Primarily used with Caterpillar equipment but may be compatible with other high-pressure applications.

flange one piece fittings

Flange One-Piece Fittings

Combine the hose fitting and flange into a single unit. Offer a compact design but limit customization options compared to separate hose fittings and flanges.

flange elbow fittings​

Flange Elbow Fittings

Integrate a 90-degree bend into the flange design, reducing the need for additional elbows in the hose assembly. Useful for tight spaces or situations where a change in direction is required near the connection point.

hydraulic hose Flange fitting Applications

Construction Equipment

Hydraulic hose flange fittings are widely used in construction equipment due to their ability to handle high pressures and vibrations. They are used for connecting hydraulic lines to components like actuators, cylinders, and pumps.

Agricultural Machinery

Hydraulic systems are essential in modern agricultural machinery . Flange fittings play a crucial role here by ensuring leak-free connections in equipment like tractors, harvesters, and plows. They are built to withstand harsh environmental conditions and heavy-duty use.

Machine Tools

Flange fittings are used in various machine tools such as excavators, bulldozers, and cranes. They provide secure connections for hydraulic systems that power functions like movement of arms, lifting mechanisms, and tool operation.

Oil and Gas Industry

In the oil and gas industry, flange fittings are used for high-pressure applications such as drilling rigs and hydraulic fracturing equipment. They are made from robust materials like stainless steel to handle extreme pressures and corrosive fluids.

Hydraulic Hose Flange fitting FAQs

A flange fitting is a specific type of connector used to join pipes, valves, pumps, and other equipment in applications that involve fluids.

Here’s a breakdown of its key features:


  • Creates a secure and leak-proof connection for high-pressure applications.
  • Flanges distribute pressure evenly over a larger area compared to other fitting types, reducing the risk of leaks.

When selecting a hydraulic hose flange fitting, consider these factors:

  • Pressure Rating: Ensure the chosen flange can handle the system’s operating pressure. Code 61 is for lower pressure, while Code 62 is for high pressure.
  • Space Constraints: Standard flanges may require more space. Consider split flanges or one-piece designs for tighter areas.
  • Assembly and Disassembly: Split flanges offer easier installation and removal if frequent access is needed.
  • Compatibility: Ensure the flange type matches the equipment or component you’re connecting to (e.g., Caterpillar or Komatsu specific designs).

By understanding the different types of hydraulic hose flange fittings and their characteristics, you can choose the most suitable option for your specific application, ensuring a secure, leak-proof, and high-performing hydraulic system.

Measuring a hydraulic flange fitting accurately ensures you get the perfect replacement part for a leak-free and secure connection. Here’s how to measure the key aspects of a hydraulic flange fitting:

Tools you’ll need:

Calipers (ideally dial or digital for better precision)

Tape measure (for overall length, if needed)

What to measure:

Flange Diameter (Dimension F):

Use the calipers in the diameter mode to measure the widest part of the flange itself, not including the bolt holes.

Flange Thickness (Dimension C):

Close the calipers on the flange’s edge to measure its thickness. This helps identify the specific flange type (e.g., standard vs. high-pressure).

Port size (diameter):

There are two ways to approach this depending on the fitting type:

  • Male threads: Measure the outside diameter (OD) of the threaded portion using the calipers in diameter mode.
  • Female threads: Measure the inside diameter (ID) of the threaded portion using the calipers in diameter mode.

Thread type:

While not strictly a measurement, identify the thread type (e.g., NPT, BSP) for proper compatibility with the hose and component you’re connecting. This information is often stamped on the fitting or found in manufacturer specifications.

Overall Length (optional):

If needed, use a tape measure to determine the entire length of the fitting, from the end of the threads (or flange face) to the opposite end.

Tips for accurate measuring:

  • Ensure the calipers are set to the correct mode (diameter or inner/outer diameter).
  • Take multiple measurements at different points for better accuracy and record the average value.
  • Refer to manufacturer specifications or sizing charts if available for your specific fitting type.
  • Double-check your measurements before purchasing a replacement fitting to avoid any mismatches.

By following these steps and using the appropriate tools, you can accurately measure your hydraulic flange fitting and ensure a proper, leak-proof connection in your hydraulic system.

Installing a hydraulic flange fitting involves creating a secure and leak-proof connection between a hose and a flanged component. Here’s a general guideline, but always refer to the specific manufacturer‘s instructions for your particular fitting:

Safety Precautions:

Pressure relief: Ensure the hydraulic system is depressurized before starting any work. Release any pressure in the lines and bleed any residual pressure from the component.

Proper tools: Use the correct wrenches or sockets with the recommended size for the fitting’s bolts. Avoid using adjustable wrenches, as they can damage the bolt heads.

Eye protection: Wear safety glasses to protect your eyes from debris or potential fluid spray during installation.


  • Hydraulic hose flange fitting
  • Gasket (often included with the fitting)
  • Thread sealant (optional, for some thread types)
  • Wrenches or sockets for tightening the bolts
  • Thread cleaner (optional, for cleaning threads)
  • Utility knife (for trimming the hose, if needed)


Prepare the Hose:

  • Cut the hose to the desired length using a sharp hose cutter. Ensure a clean and straight cut.
  • If using a braided hose, carefully trim the braid using a utility knife, following manufacturer‘s recommendations to avoid damaging the inner liner.
  • Debur the hose end (remove any sharp edges) with a file or deburring tool.
  • Apply thread sealant (if recommended for the specific thread type) to the male threads on the hose fitting.

Prepare the Flange:

  • Clean the flange surface where the gasket will sit to ensure a good seal.
  • Place the gasket on the flange, aligning it properly.

Assemble the Connection:

  • Insert the hose fitting with the attached hose into the flange opening.
  • Screw the flange bolts onto the threaded holes in the flange. Tighten the bolts hand-tight initially.

Tighten the Bolts:

  • Use a wrench or socket to tighten the bolts in a crisscross pattern to ensure even pressure on the gasket.
  • Follow the manufacturer‘s recommended torque specifications for the specific fitting and bolts. Overtightening can damage the threads or flange, while under-tightening can lead to leaks.

Final Inspection:

  • Once tightened to the proper torque, visually inspect the connection for any leaks or loose bolts.
  • Re-tighten any bolts that seem loose after the initial tightening sequence.

Do not overtighten in an attempt to stop leaks. If a leak persists, disassemble the connection and check for a damaged gasket or hose.

Additional Tips:

  • Some flange fittings may have a specific order for tightening the bolts. Refer to the manufacturer‘s instructions for proper tightening sequence.
  • If the hose requires crimping, ensure it’s done with the correct crimping tool and dies for the specific hose type and size.
  • Always use high-quality components, including hoses, fittings, and gaskets, to ensure a reliable and leak-free connection.

Remember, these are general guidelines. Always prioritize safety and follow the specific instructions provided by the manufacturer of your chosen hydraulic flange fitting for a successful installation.

kingdaflex hydraulic hose