Metric Hydraulic Fittings Manufacturer in China

❖ Highly durable

❖ Corrosion-resistant

❖ Better sealability

❖ Made of steel, stainless steel, and brass

Product List

Topa offers a full line of metric hydraulic fittings. The type and material of fitting to be purchased depends on the material of the hydraulic hose used. Please refer to our list of metric fittings.

Products Video

In this video, we show you the wide range of metric hydraulic fittings manufactured by Topa, covering a wide range of sizes and functions. These fittings utilize international metric standards to ensure a perfect fit for your hydraulic system needs. Whether you need a standard fitting or a customized solution, our video will provide you with a comprehensive reference that will give you an insight into the features and benefits of each product.

From high-strength stainless steel to corrosion-resistant copper alloys, each fitting is rigorously tested to ensure safety and stability in high-pressure environments. In addition, we show a variety of connection options, including threaded fittings and clamp fittings, to help you choose the most suitable connection solution to ensure efficient hydraulic system operation.

Made of steel or carbon steel, these metric fittings are impact-resistant, wear-resistant, electrically conductive, and durable. To learn more details, click on the video below.

Application

Topa specializes in the production of high-quality metric hydraulic fittings. Our metric hydraulic fittings are of high quality, integrity, and safety. As a result, they can be used for hydraulic fittings in machine tools, fuel, industrial, and gas plants for manufacturing or maintenance. Many industries have widely welcomed the good working performance of the couplings, and it can be applied in the following industries: Chemical, marine industry, automotive industry, etc.

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Metric Fittings Types

Metric fittings can have either parallel or tapered threads, each offering specific advantages. Parallel threads typically require an O-ring seal or another sealing method, ensuring a leak-tight connection when compressed. The O-ring is reinforced with a back-up washer and a nut, maintaining correct orientation and creating a reliable seal when the male and female parts connect.

DIN 2353 and ISO 8434

These are standard tube compression fittings used across Europe and other regions. They feature a 24-degree cone connection, making them widely compatible in hydraulic systems. These fittings are available in several variations, including DIN 20078, which also incorporates the 24-degree cone.

DIN 7631

DIN 7631 fittings are designed with a 60-degree cone in hydraulic applications. This design allows for effective sealing and pressure retention, suitable for a wide range of hydraulic systems.

DIN 74234 and DIN 74233

These fittings use a 45-degree cone, providing a balance between sealing efficiency and installation ease. Their design is common in specific hydraulic applications requiring this angle for proper sealing.

Komatsu Fittings (JIS B2070)

The Komatsu hydraulic fittings, following the JIS B2070 specification, feature a 60-degree flare, typically used for hose adapters. These fittings are prevalent in Japanese-made machinery, offering excellent reliability in high-vibration environments.

French G GAZ Fittings

Common in French hydraulic systems, Kobelco French G GAZ fittings use a 24° sealing surface and metric straight threads. These fittings are similar to German DIN fittings but feature fine threads across all sizes, unlike the coarser threads used in larger German DIN fittings.

ISO 6149-1

ISO 6149-1 is one of the most recognizable metric thread forms for North American users, primarily employed for ports on pumps, valves, and actuators. These fittings are similar to SAE ORB ports but use a bonded rubber washer to create a seal inside a machined turndown at the face of the port.

Technical Specifications

Metric hydraulic fittings are most used in Europe. Topa has DKOL DKOS, metric npt, metric jic, metric banjo, metric brake fitting, standad pipe, compression fitting.

Topa metric compression fittings are highly resistant to vibration and create strong, reliable, leak-free fittings. They meet or exceed all SAE, ISO and DIN standards. Their ferrule design reduces the effects of vibration on hydraulic systems.

Pressure Ratings

The pressure rating of metric fittings varies based on the material, size, and specific design. Typical pressure ratings for these fittings are designed to handle pressures ranging from 3000 psi (pounds per square inch) to 5000 psi for standard hydraulic systems, depending on the fitting’s material strength and design specifications.

Material Specifications

Metric hydraulic fittings are typically made from steel, stainless steel, or brass, with each material offering different corrosion resistance and durability properties. Steel fittings are common for standard applications, while stainless steel fittings are favored for environments with corrosive elements or high temperatures. Brass fittings are often used in lower-pressure applications.

Thread Standards

Metric hydraulic fittings adhere to specific international standards, such as the DIN (Deutsches Institut für Normung) and JIS (Japanese Industrial Standards). These standards define the thread sizes and types, ensuring compatibility across different equipment. The most commonly used types include BSPP (British Standard Parallel Pipe), BSPT (British Standard Pipe Tapered), and Metric threads such as M22 x 1.5.

Sealing Methods

Metric fittings often use o-ring seals or cone seals to prevent leaks under high-pressure conditions. O-rings are typically installed in the fitting grooves to create a secure seal between the male and female parts. The JIS and DIN 2353 standards specify the dimensions for these sealing surfaces to ensure leak-free performance.

Connection Types

There are various connection types for metric fittings, including threaded, flanged, and push-to-connect fittings. The most common types of connections in hydraulic systems include male and female threads, unions, elbows, and tees. The exact connection type depends on the specific design and application requirements.

Size and Compatibility

Metric fittings come in various sizes, commonly ranging from M1 to M10 and beyond, with each fitting designed to work with specific hose and pipe sizes. DIN 2353 and ISO 8434 standards provide the guidelines for fitting size compatibility to ensure that fittings match the exact hose and pipe diameter, ensuring a secure and leak-free connection.

Advantages of Hydraulic Metric Fittings

Standardized Compatibility

Hydraulic Metric fittings are designed to conform to global standards like DIN and JIS, ensuring easy compatibility across various equipment and machinery, regardless of geographic location. This standardization reduces the need for custom adapters and allows for seamless integration with other hydraulic components worldwide.

Leak-Free Performance

These fittings use O-ring seals or cone seals, which provide excellent sealing performance. The precision of these sealing methods ensures minimal risk of leakage, even under high-pressure conditions, contributing to the longevity and efficiency of the hydraulic system.

High-Pressure Resistance

Made from robust materials like stainless steel or brass, metric hydraulic fittings are capable of handling high-pressure applications. With pressure ratings typically ranging from 3000 psi to 5000 psi, they are ideal for use in demanding industrial environments, offering both safety and durability.

Easy Installation

Metric fittings are designed for easy installation and quick assembly, thanks to their precision-engineered threads and well-defined sealing surfaces. This reduces the time and labor needed during the assembly process, leading to faster system setups and less risk of installation errors.

Simplified Measurement System

The metric system operates on a simple base-10 scale, making measurements straightforward to extrapolate. This system reduces complexity when calculating dimensions and helps engineers quickly determine compatibility between different components. Additionally, the standardization of common sizes allows manufacturers and engineers to streamline their bill of materials (BOM).

Superior Vibration Resistance

Metric threads provide superior vibration resistance compared to other thread types. This is particularly important in dynamic environments where constant movement and vibration are present, as it reduces the risk of loosening or failure. Additionally, metric threads offer a larger stress-bearing cross-sectional area, improving the overall strength and durability of the connection.

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How to Identify Metric Threads: A Step-by-Step Guide

Identifying metric threads is crucial for ensuring compatibility in hydraulic and mechanical systems. Here’s a practical guide to help you accurately identify metric threads, ensuring a secure and reliable connection.

Step 1: Examine the Thread Form

The first step is to determine the type of thread form. Metric threads typically have a straight, parallel design, unlike other thread types like BSP or NPT, which are either tapered or angled. Look closely at the angle of the thread. Most metric threads, especially those per ISO standards, have a 60-degree thread angle (such as DIN 7631), while some like DIN 2353 and ISO 8434 feature a 24-degree cone.

Step 2: Measure the Thread Pitch

Metric threads are specified by their pitch, which is the distance between adjacent thread crests. To measure the pitch:

Use a thread pitch gauge (also called a thread gauge tool), which has various blades designed to match thread pitches.

Place the gauge on the threads and find the one that fits perfectly, matching the distance between threads.

The pitch is commonly measured in millimeters (mm) for metric threads, with values ranging from 0.5mm to 4.0mm (or more) for common hydraulic fittings.

Step 3: Measure the Outer Diameter

Next, measure the outer diameter of the male thread using calipers. This will give you the nominal size of the fitting (e.g., M10, M16, M22). The “M” stands for metric and the number refers to the outer diameter in millimeters.

For example, an M10 fitting means the outer diameter of the male thread is 10mm.

Step 4: Check the Thread Type (Parallel or Tapered)

Metric threads can either be parallel (where the threads run straight) or tapered (where the threads gradually narrow). To identify the type:

Parallel threads are common in fittings like DIN 2353, where the diameter remains constant along the length of the thread.

Tapered threads (such as ISO 7 and ISO 6149-1) gradually become smaller as they move away from the base.

Step 5: Identify the Seal Type (if applicable)

Metric threads often feature sealing elements like O-rings, bonded rubber washers, or cone seals. Check if the fitting includes any seal type, which is especially important in high-pressure systems. These seals ensure that the fitting remains leak-free, contributing to system safety and efficiency.

Step 6: Confirm Thread Pitch and Size Using Standards

Once you’ve measured the pitch and outer diameter, refer to international metric thread standards, such as ISO 261 and DIN 13, to confirm the specifications. These standards provide a reference chart for different thread sizes and pitches, allowing you to cross-check your measurements and identify the correct fitting.

Identifying metric threads requires attention to detail, but by following the steps above, you can be confident that you are matching and selecting the correct fitting for your system.

Avoid Common Pitfalls

At Topa, we take great care to ensure that all our metric hydraulic fittings are sized accurately, made from high-quality materials, and undergo rigorous testing for compatibility and performance. Our custom packaging solutions guarantee that your fittings arrive in perfect condition, while our comprehensive catalog allows you to easily select the correct fitting type and material for your application. With flexible ordering options and an experienced team ready to assist with any queries, Topa helps you avoid the common pitfalls in procurement, ensuring a smooth and efficient purchasing experience.

Incorrect Sizing

One of the most common mistakes in purchasing metric hydraulic fittings is selecting the wrong size. Metric fittings come in various sizes, and getting the wrong dimensions can lead to poor sealing, leaks, or even system failure. Always verify the required outer diameter (OD) and thread size before ordering. For best results, cross-check the specifications with your hydraulic system’s requirements.

Unsuitable Material Selection

Choosing the wrong material can compromise the fitting's durability and resistance to corrosion, especially in harsh environments. Metric hydraulic fittings are available in materials like stainless steel, brass, and carbon steel, each with its own benefits and limitations. Make sure to select a material that aligns with your system’s pressure ratings, environmental conditions, and chemical exposure.

Inadequate Surface Treatment

Surface treatment is essential for enhancing corrosion resistance, improving wear resistance, and ensuring long-term durability. Be cautious of suppliers offering uncoated fittings that may not withstand corrosive environments. Always check the surface finish—whether it’s chrome-plated, zinc-coated, or other protective coatings—to ensure that it meets the requirements of your application.

Choosing the Wrong Fitting Type

Metric hydraulic fittings come in different types, such as compression fittings, flare fittings, and straight fittings. Selecting the wrong type of fitting for your system can lead to installation difficulties or system inefficiencies. Make sure you understand the specific needs of your application (e.g., sealing type, thread form, pressure rating) before making your purchase.

Inconsistent or Poor Packaging

Improper or inadequate packaging can lead to damaged fittings during shipping or storage. Ensure that the fittings are well-protected in sealed bags or boxes to prevent scratches, dents, or contamination. Check for any signs of damage before accepting deliveries, as damaged goods can compromise the integrity of the fittings.

Ordering the Wrong Quantity

Overordering or underordering is a common procurement pitfall. Overordering can tie up capital and increase storage costs, while underordering can delay production and repairs. Accurately forecast the quantity you need based on your system's requirements, expected usage, and potential future maintenance needs.

Our Team

Topa Services

Customized Solutions

We provide tailored hydraulic fittings to meet your specific size, material, and design requirements, ensuring perfect compatibility with your systems.

Fast Delivery

With our efficient production and logistics capabilities, we guarantee quick turnaround times and timely delivery to keep your projects on track.

High-Quality Standards

All our fittings are manufactured under strict quality control processes, ensuring that each product meets the highest industry standards for durability and performance.

Customer Support

Our dedicated customer service team is available to assist with technical queries, product recommendations, and after-sales support, ensuring a smooth experience from start to finish.

Compatible Metric Hydraulic Fitting Supplier in China

– Professional support

More than 20 years of hydraulic engineers with comprehensive knowledge and real-world experience

– Product selection advice

Provide you with the right hydraulic fittings, products, and solutions to suit your requirements.

– Large stock

Standard hydraulic fitting types have a huge stock

– Strict quality control

From hydraulic fitting material, produce, package, shipping, and after-sales service, quality control through all process

– Excellent after-sale service

24-hour service, warranty service, training, and market analysis

Your Reliable Metric Hydraulic Fitting Manufacturer

Topa hydraulic fitting has a nut and a sleeve or collar at one or more ends. The end of the hydraulic fitting is placed on one end of the hydraulic hose. The nut is tightened, and the hydraulic ferrule is compressed. The high quality of the hydraulic fitting allows for the following advantages.

Highly Resistant to Vibration:

Topa’s metric hydraulic fittings are designed to withstand high levels of vibration, ensuring stable and secure connections even in dynamic and challenging environments.

Simple to Operate and Easy to Use:

Our fittings are engineered for quick and hassle-free installation, allowing for efficient operation and minimal downtime in your hydraulic systems.

A Reliable, Strong, and Leak-Free Connection is Guaranteed:

Thanks to precision manufacturing and high-quality seals, Topa’s fittings provide a secure, leak-proof connection that ensures optimal performance and safety in your hydraulic applications.

Sturdy and Durable with High Corrosion Resistance:

Built from robust materials and treated with advanced coatings, Topa’s fittings offer exceptional corrosion resistance, ensuring a long service life even in harsh environments.

Metric Hydraulic Fitting Quality Control

We can quickly set up a container or custom workshop at your premises to provide service and inventory tailored to your needs for demanding conditions requiring qualified technicians on call at all times.

Topa is a professional hydraulic manufacturer with many years of experience, and our excellent workshop and staff can provide our customers with high-quality hydraulic fittings at competitive prices.

Metric hydraulic fitting China supplier process Pulse test

Metric hydraulic fitting china supplier testing

Metric hydraulic fitting China factory Size Inspection

Metric hydraulic fitting China manufacturer Pulse test

Metric hydraulic fittingChina supplier check

Metric hydraulic fitting China supplier quality check

FAQ

What is metric hydraulic fitting?

The metric hydraulic fitting is a compression fitting that consists of a body, o-ring, and nut. It has a good seal and can connect metric hydraulic hoses to hydraulic fittings.

Are there metric hydraulic fittings?

Topa can manufacture a complete line of hydraulic metric fittings. Our metric hydraulic fittings are vibration resistant, provide tight, reliable connections, and prevent leaks.

What are the different types of Metric hydraulic fitting?

Hydraulic fittings can be classified according to their thread type, size, and configuration. The commonly used distinctions are O-ring, bend angle, and thread.

What is Metric hydraulic fitting's material?

The metric hydraulic fitting can be selected from steel, stainless steel, and brass materials, the choice of material being related to the pipe to be connected, and the application scenario.

What to pay attention to when choosing Metric hydraulic fitting?

First, the diameter of the fitting and the hose should match. Secondly, the choice of material for Metric hydraulic fitting should consider the environment where it is located, such as pressure, humidity, temperature, etc. Finally, what kind of application, such as quick connect or welding form.

How to connect Metirc hydraulic fitting?

Firstly, the hose should be cut to the right size with a cutting machine. Secondly, choose the right Metric hydraulic fitting in terms of use scenario and demand. finally, tighten the nut to achieve the purpose of pressing the ferrule.

How are hydraulic metric fittings measured?

First, you measure the inner and outer diameters of the hydraulic fitting with a caliper, next you calculate the distance between adjacent threads.

How do identify the different Metric hydraulic fittings?

This can be identified by checking whether the Metric hydraulic fitting is available for reuse, what type of connection port it is, in what way it is sealed, and the relevant accessory

How to determine if Metric hydraulic fitting is reusable?

For reusable Metric hydraulic fitting, you can use a wrench and a vise to take it apart and put it back together. For the non-reusable Metric hydraulic fitting, you need to use a crimping tool to do it.

What are the sealing methods of Metric hydraulic fitting?

There are three most common types of seals. o-rings, mating angles, and tapered thread designs.