Compression Hydraulic Fitting Manufacturer in China

Custom threads, precise ferrule fit, and consistent batch quality for hydraulic and industrial systems

Drawing & sample-based production
NPT, BSP, Metric, JIC available
Stable supply for bulk orders

Product List

Compression tube fittings connect tubing through a fitting body, nut, and a matching ferrule or ring system. The component arrangement and assembly method depend on the fitting series.

Select fittings by tube outside diameter, tube material and wall thickness, connection type, body configuration, and operating conditions. Pressure and temperature suitability must be checked for the specific fitting and tubing combination.

Browse the available configurations below, or submit your part list and drawings for specification review.

Compression Fittings Video

In this video, we showcase a variety of hydraulic compression fittings, highlighting each of the different hydraulic compression fittings.

We invite you to watch this video for an in-depth look at the different types of hydraulic compression fittings we offer. Whether you are looking for standard fittings or customized solutions, this video will help you make an informed choice based on your business needs.

Please feel free to ask us about any specific requirements or customization options. Our team is ready to assist you and provide you with the best hydraulic fitting solution for your needs.

Application

Compression fittings can be applied in a variety of applications, such as family, agriculture, industry, automotive, etc. Since compression fittings are easy to disassemble and maintain, most people can use them directly without any special skills.

Request a Quote for Your Compression Fitting List

Send your part numbers, tube dimensions, connection details, materials, and quantity per item. Include drawings and packaging requirements where applicable so the quotation can be prepared against a clear specification.

Compression Fittings Features

Construction

Fitting Body
Contains the tube entry, internal seating geometry, flow passage, and the specified connection at the opposite end.

Compression Nut
Applies the assembly force required to engage the matching ferrule or ring system with the tube and fitting body.

Ferrule or Cutting Ring
Provides tube retention and sealing according to the fitting design. Single-ferrule, double-ferrule, and cutting-ring systems use different component geometries and assembly procedures.

Tube Support, Where Required
Supports specified plastic or thin-wall tubing during assembly. Its use depends on the tubing and fitting series.

Additional Seals, Where Specified
Some designs include elastomeric seals at designated interfaces. These seals are separate from any tube support and must match the operating conditions.

Material

Carbon Steel
Used in selected hydraulic tube fitting series. Specify the required material grade, protective finish, and compatible tubing.

Stainless Steel
Selected where fluid compatibility and environmental corrosion resistance are important. Confirm the grade of the body, nut, ferrules, and tubing.

Brass
Used in selected industrial tube connection systems. Suitability depends on the fitting design, tubing specification, fluid, pressure, and temperature.

Surface Finish and Seals
Specify plating, passivation, or other finish requirements where applicable. For designs containing elastomeric seals, confirm the seal material against the fluid and operating temperature.

Working Principle

The working principle of compression fittings is based on the tight seal created between the ferrule and the tubing when the compression nut is tightened. Here’s how it works:

Initial Insertion: The tubing is inserted into the fitting body, with the ferrule placed over the tube.

Compression Process: As the compression nut is tightened, it pushes the ferrule against the tube. This compression causes the ferrule to grip the tube tightly, forming a reliable seal.

Leak Prevention: The compression action ensures that no fluid can escape around the connection. The tightness of the ferrule against the tube prevents leaks, even under high-pressure conditions.

Advantages of Hydraulic Adapter

Leak-Free Sealing Performance

Precision ferrule design ensures tight sealing between tube and fitting, reducing leakage risk even under pressure.

No Welding or Crimping Required

Compression fittings can be installed directly without welding, making assembly faster and easier.

Strong Resistance to Vibration

Secure mechanical grip prevents loosening in high-vibration environments such as machinery and vehicles.

Multiple Material Options

Available in brass, carbon steel, and stainless steel to match different fluids and environments.

Precise Thread and Size Matching

Support for NPT, BSP, Metric, and JIC threads ensures correct fitting with your system.

Stable Batch Consistency

Controlled machining process ensures consistent dimensions across bulk orders.

Confirm the Tube and Fitting Combination

Share the tube OD, wall thickness, material, fitting series, and operating conditions to identify the specifications that need confirmation before ordering.

Hydraulic Compression Fitting Installation Tips

Proper installation of hydraulic compression fittings is crucial to ensure reliable, leak-free connections in hydraulic systems. Here are some key tips for a successful installation:

Prepare the Tubing Properly

Tip: Before installing the compression fitting, ensure that the tubing is cut cleanly and squarely. Use a tubing cutter for a smooth, straight cut. Avoid using a hacksaw, as it can cause burrs or rough edges that may compromise the seal.

Why: A clean, square cut allows for a better seal between the tubing and the fitting, preventing leaks.

Deburr the Tubing Edges

Tip: After cutting the tube, always deburr the edges using a deburring tool or a reamer.

Why: Burrs or sharp edges can damage the ferrule or cause improper sealing, leading to leaks or poor connection quality.

Select the Right Compression Fitting

Tip: Choose the correct fitting type and size based on the tubing diameter and application requirements. Ensure the fitting material is compatible with the medium being transported (e.g., oil, gas, or water).

Why: Using the right size fitting ensures a secure connection and prevents leaks or fitting failures. Incorrectly sized fittings can result in improper compression and performance issues.

Ensure Proper Alignment of the Tubing

Tip: When inserting the tubing into the fitting, make sure the tube is fully inserted, with no gaps between the tube and the fitting body.

Why: Proper alignment ensures that the ferrule is evenly compressed, creating a leak-proof seal. Misalignment can lead to uneven compression and weak connections.

Tighten the Compression Nut Correctly

Tip: Tighten the compression nut by hand first, and then use a wrench to tighten it further. Avoid overtightening, as this can damage the fitting or tubing.

Why: Proper torque is essential for creating a secure seal. Overtightening can crush the tubing or compress the ferrule too much, while under-tightening may result in leaks.

Inspect the Fitting After Installation

Tip: After installation, inspect the fitting to ensure it’s properly tightened and the tubing is securely held in place. Look for any signs of leakage or misalignment.

Why: An initial check helps to identify potential issues before the system is pressurized, preventing costly repairs and downtime.

Avoid Using Worn or Damaged Fittings

Tip: Always use new compression fittings, especially when the components are made of softer materials like brass. Reusing worn or damaged fittings can result in poor sealing and potential system failure.

Why: Worn fittings may not provide a proper seal, leading to leaks and reduced system efficiency.

Use Anti-Seize Lubricant (if applicable)

Tip: In some cases, apply a small amount of anti-seize lubricant or thread sealant on the threads of the compression nut to prevent galling or seizing over time.

Why: Lubrication helps prevent friction, making it easier to tighten the nut and ensuring smooth installation, especially in high-temperature or high-pressure applications.

Avoid Common Pitfalls

At Topa, we understand the challenges our customers face when selecting and installing hydraulic fittings. Many of our customers have encountered common pitfalls that can lead to system inefficiencies, leaks, or costly maintenance issues. We’ve identified key areas where mistakes are often made and want to highlight them so you can make informed decisions when selecting hydraulic fittings.

Single or Double Ferrules

Many customers will forget to select the number of ferrules at the time of purchase, resulting in a faulty product. A single ferrule will provide a slightly less tight fitting than a double ferrule.

Fitting Thread Compatibility

Incorrect matching of fitting threads such as BSP, NPT or JIC is a common problem. The use of incompatible threads can result in a poor seal, leading to leaks or system inefficiencies.

Branch Tee or Straight Tee

Confusion between branch tees and straight tees can lead to improper installation, especially when connecting multiple pipes. A branch tee is used to branch off a main line, while a straight through tee is used to extend a main line.

Material Selection Issues

Choosing the wrong material for hydraulic fittings is another common pitfall. Some customers choose materials that are not suitable for the operating conditions of the system, such as brass for high temperature environments or stainless steel for corrosive environments.

Limited-Time Offer: Free Consultation

For a limited time, we are offering a free consultation with our technical team. Let us help you optimize your hydraulic systems for maximum performance!

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Topa Services

At Topa, we pride ourselves on delivering tailored, high-quality hydraulic solutions designed to meet your specific needs. With over a decade of experience in hydraulic fittings and a dedication to customer satisfaction, we provide services that ensure your operations run efficiently and smoothly.

Specification Review

Review tube dimensions, fitting connections, materials, and operating requirements before quotation.

Quick Production Time

Our efficient production process ensures fast turnaround times, even for large orders.

Global Shipping

We provide reliable international shipping, ensuring your products reach you on time, wherever you are.

Technical Support

Our expert team offers in-depth technical support to guide you in selecting the right solutions for your systems.

Quality Assurance

Every product undergoes rigorous quality control to guarantee high performance and durability.

Flexible Payment Options

We offer a range of flexible payment terms and options to suit your business needs.

Ongoing Maintenance

We provide after-sales support and maintenance services to ensure the long-term reliability of your hydraulic systems.

Custom Packaging

Our packaging services are tailored to protect your products and meet your specific shipping requirements.

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Manufacturing Process

From raw material to final inspection, every hose fitting goes through controlled machining steps to help you get stable quality and reliable batch consistency.

Quality Check

Each hydraulic fitting is checked through a series of inspection and testing procedures to ensure consistent performance, reliable sealing, and long service life in hydraulic systems.

Hardness Testing

Material hardness is tested to ensure the fitting has the required strength and durability. Proper hardness helps prevent deformation, cracking, or failure under high-pressure working conditions.

Surface Roughness Testing

Surface roughness is inspected to ensure proper sealing performance. A controlled surface finish helps reduce leakage risks and improves connection reliability.

Profile Inspection

Profile testing is used to verify the shape and angle of threads and sealing surfaces. This ensures that each fitting matches standard specifications such as JIC, BSP, or ORFS connections.

Salt Spray Testing

Salt spray testing evaluates corrosion resistance of the plated surface. This helps ensure the fittings can perform reliably in humid, outdoor, or harsh operating environments.

FAQ

What is a compression hydraulic fitting?

A compression hydraulic fitting connects hydraulic tubes or pipes by using a nut and ferrule to create a tight seal. It is commonly used where a secure, removable tube connection is needed.

How does a compression hydraulic fitting seal?

It seals when the nut tightens the ferrule onto the tube surface. The ferrule grips the tube and forms a metal-to-metal sealing area.

What causes compression hydraulic fittings to leak?

Common causes include wrong ferrule size, mismatched thread type, damaged tube surface, over-tightening, under-tightening, or reusing old ferrules.

Can compression hydraulic fittings be used in high-pressure systems?

Yes, but the fitting material, ferrule type, tube size, and pressure rating must match the hydraulic system. For high-pressure or vibration systems, double ferrule fittings are often preferred.

What is the difference between single ferrule and double ferrule fittings?

Single ferrule fittings use one ferrule for gripping and sealing. Double ferrule fittings use one ferrule for sealing and another for gripping, giving better vibration resistance and sealing stability.

How do I choose the right compression hydraulic fitting size?

Check the tube outer diameter, thread type, thread size, pressure rating, and material. If you are replacing an old fitting, send a drawing, sample, or clear photos for matching.

Can I reuse a compression fitting ferrule?

It is not recommended. Once compressed, the ferrule is already deformed. Reusing it may cause poor sealing, tube damage, or leakage.

What materials are available for compression hydraulic fittings?

Common materials include carbon steel, stainless steel, and brass. Carbon steel is used for general hydraulic systems, stainless steel for corrosive environments, and brass for lower-pressure applications.

Are compression hydraulic fittings suitable for vibration?

Yes, but the correct type must be selected. For equipment with vibration or pressure fluctuation, double ferrule compression fittings provide stronger tube grip and more reliable sealing.

Can Topa provide custom compression hydraulic fittings?

Yes. Topa can support custom sizes, thread types, materials, surface treatment, logo, and packaging. Drawings, samples, or photos can be used for accurate matching.