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Hydraulic Flange Supplier in China

  • SAE Code 61 & Code 62 Options
  • Threaded, Split & Weld-On Designs
  • Drawing-Based Custom Production
  • Multi-SKU & Repeat-Order Support

Product List

TOPA supplies hydraulic flange components in SAE Code 61, Code 62, split, threaded, weld-on, counter, blind, elbow, adapter, and selected custom configurations. Product selection should be based on the flange standard, nominal size, bolt pattern, port connection, sealing structure, material, pressure requirement, and mating component.

Code 61 SAE hydraulic flanges

Code 61 SAE Hydraulic Flange

Code 61 goes to 3,000 psi with an o-ring side has a flat side, or a complete set,s commonly used in fluid power systems.

Code 62 SAE hydraulic flanges factory

Code 62 SAE Hydraulic Flange

Code 62 is available up to 6000 psi and has an O-ring with a flat side, or a complete set, typically used in hydrodynamic systems.

9000PSI SAE hydraulic flanges factory

9000PSI SAE Hydraulic Flange

It can withstand pressures up to 9000 psi and is available in both union and split models

ORFS hydraulic flange factory

Hydraulic ORFS Flange

O-Ring Face Seal ORFS Male x Code 61 Flange Adapter

JIC hydraulic Flange adapter manufacturer

JIC Hydraulic Flange

JIC fittings are hydraulic fittings with parallel threads and a 37-degree flared seating surface. Designed by SAE J518 and ISO 6162.

Uncut SAE SPLIT FLANGE wholesale

Uncut SAE Split Flange

Uncut SAE hydraulic flange clamp with drilled or threaded bolt holes for high strength and durability.

Hydraulic sae cut split flanges

CUT SAE Split Flange

Cut Split SAE Flanges are hydraulic flanges made in accordance to SAE J518 / ISO6162 standards. They are meant for high pressure applications in 2 series, series 3000 and series 6000.

SAE Split Flange Halves manufacturer

Split SAE Hydraulic Flange

Split SAE hydraulic flange clamp is flexible and can be disassembled by bolts and clips.

BSP SAE Flange manufacturer

BSP SAE Flange

SAE Female Threaded Flange with BSP-Thread SAE-TF_G according to SAE J518 Code 61, ISO 6162-1 (3.000 psi) or SAE J518 Code 62, ISO 6162-2 (6.000 psi)

BSPP SAE 90D FLANGE supplier

BSPP SAE Elbow 90° Flange

SAE 90° Female Threaded Flange with BSPP-Thread SAE-TF90_G according to SAE J518 Code 61, ISO 6162-1 (3.000 psi) or SAE J518 Code 62, ISO 6162-2 (6.000 psi)

BSPP SAE COUNTER FLANGE wholesale

BSPP SAE Counter Flange

BSPP SAE Counter Flanges are hydraulic flanges available in accordance to SAE J518 or ISO6162 standards. They can suit for high pressure applications.

BSPP SAE DOUBLE FLANGE factory

BSPP SAE Double Flange

BSPP SAE Double Flanges are hydraulic flanges made in accordance to SAE J518 / ISO6162 standards. They are suit for high pressure applications ,and made of stainless steel and steel.

NPT SAE counter Flange fitting wholesaler

NPT SAE Counter Flange

Cut Split SAE Flanges are hydraulic flanges made in accordance to SAE J518 / ISO6162 standards. They are meant for high pressure applications in 2 series, series 3000 and series 6000.

NPT SAE 90Degree FLANGE supplier

NPT SAE Elbow 90° Flange

NPT SAE 90D Flanges are hydraulic flanges made in accordance to SAE J518 / ISO6162 standards. They are meant for high pressure applications in series 3000 and series 6000.

NPT SAE DOUBLR FLANGE wholesale

NPT SAE Double Flange

NPT SAE Double Flanges are hydraulic flanges made in accordance to SAE J518 / ISO6162 standards. They are meant for high pressure applications in 2 series, series 3000 and series 6000.

NPT SAE Flange factory

NPT SAE Flange

NPT SAE Flanges are hydraulic flanges made in accordance to SAE J518 / ISO6162 standards. They are meant for high pressure applications in 2 series, series 3000 and series 6000.

SAE double flange factory

SAE Double Flange

SAE Double Flanges are hydraulic flanges made in accordance to SAE J518 / ISO6162 standards. They are meant for high pressure applications in 2 series, series 3000 and series 6000.

SAE 90D FLANGE manufacturer

SAE Elbow 90° flange

SAE 90° Weld On Flange SAE-WOF90 according to SAE J518 Code 61, ISO 6162-1 (3.000 psi) or SAE J518 Code 62, ISO 6162-2 (6.000 psi).

SAE FLANGE manufacturer

SAE Flange

SAE flanges different straight and 90° elbow versions in the standard-pressure series for butt welding, socket welding, with female thread and with male thread. Available in steel or stainless steel.

SAE Counter Flange fitting factory

SAE Counter Flange

SAE flanges are used as a reliable alternative to common pipe and tube connectors. There are two pressure series for SAE Counter flanges: 3000 psi and 6000 psi.

SAE Blind Flange supplier

SAE Blind Flange

SAE-BF according to SAE J518 Code 61, ISO 6162-1 (3.000 psi) or SAE J518 Code 62, ISO 6162-2 (6.000 psi).

SAE Distance Flange with Test Point 90° wholrsale

Hydraulic SAE Test Point 90° Distance Flange

SAE Distance Flange with Test Point 90° SAE-FTP according to SAE J518 Code 61, ISO 6162-1 (3.000 psi) or SAE J518 Code 62, ISO 6162-2 (6.000 psi).

SAE Socket Weld Flange wholesale

SAE Socket Weld Flange

SAE Weld On Flange SAE-WOF according to SAE J518 Code 61, ISO 6162-1 (3.000 psi) or SAE J518 Code 62, ISO 6162-2 (6.000 psi)

SAE Socket Weld Flange flat factory

SAE Socket Weld Flange Flat

SAE Socket Weld Flange flat 500 PSI SAE-SWFF according to SAE J518 Code 61, ISO 6162-1 (3.000 psi)

SAE adapter flange factory

SAE Adapter Flange

SAE flange adaptors and counter flanges, different versions in the high-pressure series for butt welding, socket welding and with male thread.

SAE L-Block Flange Connectors supplier

SAE L-Block Flange Connector

SAE L-Block Flange Connectors SAE-LBC according to SAE J518 Code 61, ISO 6162-1 (3.000 psi) or SAE J518 Code 62, ISO 6162-2 (6.000 psi).

Straight Gear Pump Flanges factory

Straight Gear Pump Flange

For maximum operating pressures up to 250 bar. Available in steel. As a complete set with bolts, lock washers and O-ring.

90° Elbow Gear Pump Flanges factory

90° Elbow Gear Pump Flange

90° elbow pump flanges hole diameter from 26 to 56 mm. For maximum operating pressures up to 315 bar. Available in steel. As a complete set with bolts, lock washers and O-ring.

SQUARE ORING SIDE BLIND FLANGES factory

Square O-ring Side Blind Flange

Square O-ring side blind flanges are hydraulic flanges made in accordance to JIS B2291 standards. They are used to build connection between pipes or pipes-to-components.

SQUARE FLANGES COMPLETE SET supplier

Square Flanges Complete Set

Square Flanges are hydraulic flanges made in accordance to JIS B2291 standards. They are used to build connection between pipes or pipes-to-components. The Pressure Range: 210Bar or 21 Mpa .

SQUARE FLAT SIDE BLIND FLANGES wholesale

Square Flat Side Blind Flange

Square flat blind flanges are hydraulic flanges made in accordance to JIS B2291 standards. They are used to build connection between pipes or pipes-to-components.Available in 210 bar pressure.

Stainless steel SAE hydraulic flanges factory

Stainless Steel SAE Hydraulic Flange

The hydraulic SAE flanges are high-pressure flanges made of stainless steel and can be connected by socket weld, butt weld, NPT, and BSPP.

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Products Video

In this video, we showcase a wide range of hydraulic flange fittings designed for various industrial applications. Our flanges are engineered to meet rigorous standards of performance, durability, and ease of use. Whether you’re working in construction, agriculture, or manufacturing, you’ll find the perfect solution for your hydraulic systems.

The video highlights our most popular flange types, including standard and custom configurations, that are ideal for both low and high-pressure environments. We emphasize the flexibility of our products in terms of material selection, size, and design, ensuring they fit seamlessly into your existing systems.

Watch the video to see the full range of hydraulic flange fittings in action. If you have any questions or need assistance with a custom order, don’t hesitate to contact us. Let Topa be your trusted partner in hydraulic solutions!

Application

Hydraulic flanges are commonly used to connect high-flow hydraulic lines with pumps, valves, cylinders, manifolds, motors, and rigid pipes in mobile and industrial equipment. Flange selection should be based on the required standard, Code 61 or Code 62 series, nominal size, bolt pattern, pressure requirement, port connection, material, and operating environment.

Hydraulic flangemanufacturer application

Material Handling Equipment

Hydraulic flanges are used in truck-mounted cranes, mobile cranes, aerial work platforms, forklifts, reach stackers, container handlers, and heavy transport equipment. They connect pumps, control valves, hydraulic cylinders, motors, and large-bore pressure or return lines where compact routing and secure bolted connections are required.

Hydraulic flange supplier application

Earthmoving Machinery

Hydraulic flange connections are used in excavators, wheel loaders, bulldozers, motor graders, drilling rigs, concrete pumps, and mining haul equipment. Typical connection points include main pumps, valve blocks, travel motors, swing motors, hydraulic cylinders, and high-flow hose or tube assemblies.

Hydraulic flange factory application

Oil & Gas Offshore Equipment

Hydraulic flanges are used in drilling rigs, offshore cranes, pipe-handling systems, winches, tensioners, hydraulic power units, valve actuators, and well-service equipment. Material, sealing, corrosion protection, pressure series, and inspection requirements should be confirmed for each offshore or oilfield application.

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Hydraulic Flange Adapters Features

Hydraulic flange adapters are essential components in modern hydraulic systems, providing a reliable and efficient means of connecting various hydraulic parts. Designed to withstand high pressures and extreme environments, these adapters ensure secure, leak-free connections between hoses, fittings, and machinery. With their customizable features, durable materials, and advanced sealing mechanisms, hydraulic flange adapters play a critical role in maintaining the integrity and safety of hydraulic systems across various industries.

Hydraulic flange adapters design

Basic Design

Hydraulic flange adapters are designed to provide a reliable and leak-free connection between hydraulic components. They typically feature one end with a flat face that includes a groove to house an O-ring for a secure seal. The other end may have threads (such as 37° flare or ORFS thread) or be designed to connect to hydraulic hoses or flanges. The design ensures compatibility with a wide range of hydraulic systems and is customizable to accommodate various system specifications.

The adapters are designed with precision to ensure a tight fit, preventing fluid leakage even under high-pressure conditions. The flat face with an O-ring groove enhances the sealing performance, especially when used with flange clamps, ensuring optimal connection integrity.

Sealing Design

The sealing system of hydraulic flange adapters is one of its most critical features. They commonly use O-rings made from materials like rubber, fluororubber, or PTFE to provide a tight, reliable seal. The O-ring is placed in a groove on the flat face of the adapter, effectively preventing fluid leakage in the connection.

In some cases, the sealing system may also include PTFE seals or metal sealing rings for high-pressure and high-temperature applications. These materials ensure that the adapter performs well in extreme conditions and can withstand exposure to chemicals, heat, and high pressures without degradation.

Hydraulic flange adapters seal
install Pipe Flanges Topa

Pressure

Hydraulic flange adapters are designed to withstand high pressures, ensuring they can handle the demanding environments typically found in hydraulic systems. The pressure rating depends on the material used, the size of the adapter, and the type of sealing system. Most hydraulic flange adapters are engineered to handle pressures ranging from 3,000 psi to over 9,000 psi, depending on the application.

The robust design of the adapter ensures that it can maintain a secure connection even under fluctuating or high-pressure conditions, which are common in hydraulic circuits. Their ability to perform under these pressures makes them essential for industries such as construction, manufacturing, and chemical processing, where hydraulic systems operate under intense stress.

Material

Hydraulic flange adapters are made from materials selected for their strength, corrosion resistance, and ability to withstand harsh environments. Common materials include carbon steel, which offers excellent strength and durability for general applications, and stainless steel, which provides superior corrosion resistance for use in more demanding environments like marine and chemical industries.

Other materials like aluminum alloy are used in lighter applications where weight is a concern, and brass may be used in low-pressure systems for its good corrosion resistance and moderate strength. The choice of material ensures that the adapter can meet the specific requirements of different hydraulic systems and environments, ensuring long-lasting performance.

 

Hydraulic flange adapters
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Hydraulic Flange Basics

Hydraulic flanges play an essential role in ensuring efficient and reliable performance in hydraulic systems. With their ability to provide leak-free, secure connections, they contribute to maintaining the integrity of the entire hydraulic circuit, helping to prevent system failures due to leakage or pressure loss. Their design and working principles make them a critical component in both industrial and commercial hydraulic applications.

Hydraulic Flange Features

Appearance

A hydraulic flange is a critical component used in hydraulic systems to connect hoses, pipes, or tubes to various equipment such as pumps, valves, and cylinders. It typically consists of a flat, circular disc with holes for bolts or screws to fasten the flange to another mating part. The flange may come in different sizes and materials, such as steel, stainless steel, or carbon steel, depending on the specific application and pressure requirements. Hydraulic flanges are often designed to have a smooth, flat surface to ensure a tight seal and prevent leaks.

Flanges are commonly available in several styles, including:

Fixed Flanges: Bolted directly to a system without rotation.

Rotatable Flanges: Allow rotation for easier alignment or flexibility in assembly.

Fixed/Rotatable Flange Connections: Designed for specific system requirements.

Working Principle

The hydraulic flange is primarily used to create a secure and leak-proof connection between hydraulic components. Its working principle is based on the use of high pressure to generate a tight seal, allowing fluid to flow without leakage in the hydraulic system.

Connection: The hydraulic flange is installed on the end of a hydraulic pipe or hose. The flange is positioned against another flange on a mating part, such as a pump or valve, and is secured with bolts or nuts to ensure a firm connection.

Sealing: A gasket or O-ring is typically placed between the two flange faces to provide a tight seal. The high pressure within the hydraulic system presses against the flange, ensuring that the seal is maintained and preventing leakage.

Pressure Transfer: When the hydraulic fluid flows through the system, the flange helps transfer the fluid under high pressure to other components, such as actuators or cylinders. The robust design of the flange ensures that it can withstand the stress and pressure associated with high-performance hydraulic systems.

Hydraulic Flange working principle

Reach Out to Topa for Expert Support

Have questions or need advice on the right hydraulic flange for your project? Let us help you find the perfect solution tailored to your needs. Get in touch with us today!
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Types of Hydraulic Hose Adapter

Hydraulic flanges come in various types, each designed to fulfill specific requirements for hydraulic systems. Here are the main classifications of hydraulic flanges:

Hydraulic Adapter Flanges
Hydraulic Flange Adapter

The hydraulic flange adapter is a special fitting assembly used to connect hydraulic lines to a system. It is an intermediate piece between different flange types or between flanges and other components such as valves, pumps, or cylinders.

uncut hydralic flange Topa
Uncut Hydraulic Flange

Uncut hydraulic flanges are typically used in applications where the flange needs to be modified or adjusted after installation. They are supplied without pre-cut holes, allowing the installer to drill or cut holes as needed for bolt placement.

cut split hydralic flange Topa
Split Hydraulic Flange

Split flanges consist of two parts that can be assembled around the pipe or hose. They are used in cases where easy assembly and disassembly are required, or when the pipe cannot be removed for flange installation. The split design makes it easier to service or modify the hydraulic system.

90° Elbow hydralic flange Topa
Elbow 90° Flange

An elbow 90° hydraulic flange is designed to change the direction of fluid flow by 90 degrees. It combines a flange connection with a 90° elbow to redirect hydraulic fluid within a system.

thread hydralic flange Topa
Threaded Hydraulic Flange

A threaded hydraulic flange is equipped with internal or external threads that allow it to be screwed into place, creating a secure, threaded connection between hydraulic components. This type of flange is used in systems where welding or bolting is not practical.

raised Face hydralic flange Topa
Raised-Face Flanges

A raised-face hydraulic flange has a raised portion around the bolt holes where the flange meets the sealing surface of the mating component. This design helps to concentrate pressure at the sealing point, creating a more reliable seal and preventing leakage under high-pressure conditions.

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Advantages of Hydraulic Flanges

Hydraulic flange connections are widely used in demanding mobile equipment applications due to their numerous advantages. Here’s an overview of the key benefits:

High Pressure, Shock, and Vibration Resistance

Hydraulic flange connections are well-suited for high-pressure applications, making them ideal for mobile equipment that experiences extreme pressures and operating conditions. The robust design can withstand shock and vibration, especially in larger sizes, ensuring a reliable connection under demanding conditions.

Flexible and Adapter-Free Connections

Flange connections allow easy integration between hoses and tubes/pipes without the need for additional adapters. This flexibility makes it easier to design and assemble hydraulic systems where varying sizes and configurations are needed, simplifying installation and reducing component complexity.

Easy Connection Between Rigid Lines

Flanges provide a simple and reliable method for connecting rigid lines, such as tube-to-tube or pipe-to-pipe connections. This feature aids in both installation and maintenance, making the system easier to assemble and disassemble when repairs or upgrades are needed.

High Resistance to Loosening

In severe hydraulic service conditions, flange connections offer exceptional resistance to loosening, even in environments subject to high vibration, shock, or pressure fluctuations. This helps to maintain the integrity of the hydraulic system over time, reducing the risk of leaks and system failures.

Ease of Assembly with Reasonable Torque

Flange connections can be assembled with moderate assembly torques, even in larger sizes. This makes the installation process more straightforward and less labor-intensive, reducing the risk of over-tightening or damaging the components.

Assembly in Tight Spaces

One of the most significant advantages of hydraulic flanges is their ability to be assembled in confined or hard-to-reach spaces. Unlike traditional threaded connections, flanges can be installed where wrench swing clearance is limited, making them ideal for compact systems or mobile equipment where space is a premium.

Quality, Reliability, and Innovation

Don’t settle for less when it comes to hydraulic flanges. With Topa, you’re choosing one of the best manufacturers in China.
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Hydraulic Flange Cross-Reference & Specification Checking

Existing part numbers, supplier catalogs, drawings, physical samples, and flange photos can be used as starting points for hydraulic flange identification. However, matching a reference number or finding a visually similar flange does not confirm that the two products are interchangeable.

Before quotation or production, the flange series, nominal size, bolt pattern, sealing groove, port connection, key dimensions, material, pressure requirements, and mating component should be checked against the available technical information.

1 inch crimp flange
Reference Part Number

Provide the existing supplier part number, internal SKU, equipment reference, or catalog number used in your current purchasing system.

JIS Flange seat Fittings
Flange Interface

Confirm whether the flange follows SAE J518, ISO 6162, JIS, a gear-pump pattern, a square-flange system, or another specified interface.

split Hydraulic Flange Installation
Size & Mounting Pattern

Confirm the nominal flange size and the required internal flow passage. Nominal size should not be determined only from the outside diameter.

Hydraulic flange adapters
Port Connection

Specify whether the opposite connection is BSPP, BSPT, NPT, JIC, ORFS, Metric, socket-weld, butt-weld, or another connection type.

hydraulic flange seal
Sealing Groove

Confirm the O-ring groove diameter, groove depth, flange-face design, sealing position, and required seal material when applicable.

hydraulic flange various types
Material

Specify carbon steel, stainless steel, or another required material, together with any applicable surface treatment or corrosion-resistance requirement.

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More Than Just a Hydraulic Fittings Manufacturer

At Topa, we are committed to delivering high-quality hydraulic solutions tailored to the specific needs of our clients. With over a decade of expertise in manufacturing hydraulic fittings, hoses, and accessories, we pride ourselves on providing customizable products that ensure optimal performance and durability. Our dedication to innovation, exceptional customer service, and eco-friendly practices have earned us the trust of clients worldwide. Whether you’re looking for custom hydraulic solutions or reliable, efficient components, Topa is your partner in ensuring the success of your hydraulic systems.

Customizable Hydraulic Solutions

We offer tailored hydraulic fittings and hoses to meet specific client needs.

High-Quality Manufacturing

Our products are made using advanced production lines and materials.

Flexible Design Options

We provide customizable sizes, materials, and logos for all our products.

Commercial Quotation

Quotations are prepared according to flange type, quantity per SKU

International Shipment

Export packaging, shipment method, destination, documentation.

Experienced Support Team

Our skilled team provides professional technical support for product selection and installation.

Confirmed Production Schedule

Production schedules are reviewed according to flange series, product specifications, SKU quantity

Comprehensive Testing

All products undergo rigorous quality control to ensure reliability and durability.

Eco-Friendly Materials

We use lead-free, environmentally friendly materials for all our products.

Top After-Sales Service

We offer ongoing support and assistance with installation, maintenance, and troubleshooting.

Submit Reference Part Numbers

Why Choose Us

As one of China’s leading manufacturers of hydraulic flanges, Topa stands out for its commitment to quality, precision, and innovation. With years of experience in the hydraulic industry, we specialize in producing high-performance hydraulic flanges that meet international standards and exceed customer expectations.

Our hydraulic flanges are designed to withstand the most demanding applications, offering superior resistance to pressure, shock, and vibration. Whether it’s for mobile equipment or industrial machinery, Topa’s flanges are engineered for reliability and durability, ensuring long-lasting performance even in the harshest environments.

At Topa, we take pride in our advanced manufacturing capabilities, which include state-of-the-art CNC machines and a dedicated team of skilled engineers. Our flanges come in a variety of materials, sizes, and configurations, and are fully customizable to meet the unique requirements of each client. From standard designs to specialized solutions, we deliver hydraulic flanges that provide a perfect fit and optimal functionality.

By choosing Topa, you partner with one of the best hydraulic flange manufacturers in China—reliable, cost-effective, and committed to delivering excellence in every product we supply.

hydraulic flange manufacturer Workshop

FAQ

What is a hydraulic flange?

Hydraulic flange connections are used for the most demanding applications, as they are often suitable for high pressures, shocks and vibrations and in demanding environments such as larger sizes.

What is an SAE flange?

They are a range of high-pressure hydraulic flanges produced to SAE J518 standards.

What are the types of flanges?

In general, flanges are threaded or welded. The two flanges are joined together by gaskets and bolts to stop leaking. There are a number of flanges, such as socket welding flanges, socket flanges, blind flanges and butt welding flanges. In addition, there are some special flanges, such as rotating flanges, reducer flanges, etc.

What information is required to identify a hydraulic flange?

Please provide the flange standard, pressure series, nominal size, bolt pattern, port connection, sealing groove, key dimensions, material, pressure requirement, and available drawing or photo.

How do I distinguish Code 61 from Code 62?

Code 61 and Code 62 should be identified by the applicable standard, dimensions, bolt pattern, flange thickness, sealing groove, and nominal size. Pressure-series identification should not be based on appearance alone.

Can you produce hydraulic flanges according to drawings?

Drawing-based production can be reviewed according to dimensions, tolerances, material, sealing geometry, bolt pattern, pressure requirements, quantity, marking, and inspection requirements.

Why do we use flange?

Hydraulic flanges can be used to connect pipes, fittings and other systems. Flanges are bolted together and sealed by gaskets for ease of use.

How do the flanges form a seal?

Metal-to-metal flanges are sealed by the clamping force provided by the clamp tightening the bolts. The flange with an O-ring is sealed by tightly compressing the O-ring and the metal plane on the other side together.

Can you cross-reference an existing hydraulic flange?

Existing part numbers, drawings, catalogs, samples, and photos can be used as identification references. All critical interface and application requirements should be verified before volume purchasing.

Can you quote multiple flange types and sizes in one RFQ?

Yes. You can submit a product list containing different flange series, nominal sizes, port connections, configurations, materials, and quantities. Please include the quantity required for each SKU.

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