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How to identify American ORFS and ORB threads?


American ORFS and ORB threads are two commonly used thread types in mechanical engineering. Although they look almost identical, there are some differences in usage scenarios, features, and specifications. In this article, we will introduce what American ORFS and ORB threads are to help you better understand the differences between them.

American ORFS (O-Ring Face Seal) thread

American ORFS threads are a common thread connection method widely used in hydraulic systems. ORFS, also known as O-Ring Face Seal, is a hydraulic thread standard established by the National Standard Joint Committee (NSJC) in the United States.

ORFS connectors can be used to connect both imperial and metric hard pipes. In addition,there are two installation methods for the liner,one is welding type and the other is sleeve type (Parker Parflange)®。There are two types of hexagonal faces for the joint body and nut: English and metric; There are multiple forms of oil port ends to choose from. ORFS connectors can also be connected to hose connectors.

American ORFS threads have many advantages. Firstly, it can withstand pressures up to 6000 psi and is suitable for high-pressure and high flow hydraulic systems, ensuring the safety and reliability of the system. Secondly, its structure is relatively simple, easy to install, and does not require too many tools and skills, thus saving time and cost. Secondly, it has strong shock absorption performance and can maintain tight connections in high vibration environments. In addition, it is easy to maintain, allowing for disassembly and reassembly, reducing the difficulty and cost of system maintenance.

American ORFS threads are widely used in practical applications and involve numerous industries. In industrial machinery and equipment, the hydraulic system is a crucial component, and the high-pressure, high flow, and high load characteristics of American ORFS threads ensure the normal operation of the hydraulic system. At the same time, it is also widely used in modern equipment such as engineering machinery, agricultural machinery, and construction machinery. Especially in some hazardous environments, the application of American ORFS threads can enhance the safety of the system and improve the work safety of hydraulic system operators.

How to identify American ORFS and ORB threads? 1

American ORB (O-Ring Boss) thread

American ORB (O-Ring Boss) threads are a common method of connecting hydraulic and pneumatic joints. It is defined by the US Federal Standard BBSI B16.5, also known as the SAE J1453 standard.

ORB threads have multiple advantages, one of which is their widespread use. ORB threaded connectors are common pipe and fitting joints in hydraulic and pneumatic systems, and have also been widely used in the manufacturing of automobiles, ships, industrial machinery, aviation, and medical equipment.

Another advantage is its sealing performance. ORB threaded connector is a pipeline connection method that is airtight, compressed, waterproof, corrosion-resistant, and vibration resistant. This is because the ORB threaded connector is based on a rotating flange, which is composed of a fastening screw and a sealing ring. When this fastening screw rotates and presses tightly against the sealing ring, it can effectively prevent liquid or gas leakage.

In the practical application of ORB threaded connectors, it is necessary to pay attention to some important details. Firstly, the correct type of sealing ring should be selected. The most commonly used sealing ring in ORB connectors is the BUNA-N sealing ring. Do not use non elastic sealing rings such as hard plastic funnel plugs, as they will not produce a good sealing effect. In addition, the correct tightening force is important. If the tightening force is too strong, it may damage the joint. If the tightening force is too small, it may cause oil leakage.

Due to the widespread use of ORB threaded connectors, there are also a wide variety of related ORB thread specifications and sizes. In practical operation, it is important to choose the correct specifications and sizes. If used improperly, it may cause pain or damage to the connector.

How to identify American ORFS and ORB threads? 2

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1.With 20 years of experience in the research and development, production, and sales of American, British, and metric hydraulic connectors, you are a trustworthy old enterprise.

2. There are 25000+series and sizes of hydraulic connectors in the huge warehouse, and you will definitely be able to find the products you want.

3.200 fully automatic CNC equipment, efficient production, fast delivery, retaining every customer with quality and service.


Firstly, from the perspective of usage scenarios, American ORFS threads are mainly suitable for high-pressure hydraulic systems and precision equipment. In these systems, ORFS threads can withstand extremely high pressure to ensure stable operation of the system. At the same time, ORFS threads also have excellent high-temperature resistance, vibration resistance, and corrosion resistance, allowing them to maintain stable performance in harsh environments.

In contrast, ORB threads are more suitable for low pressure hydraulic systems. Although it bears low pressure, ORB threads also perform well in terms of vibration resistance and corrosion resistance. This makes ORB threads highly reliable and stable in low pressure hydraulic systems.

Secondly, there are certain differences in characteristics and specifications between American ORFS threads and ORB threads. The thread spacing of ORFS threads is small, and the thread angle is large, which makes ORFS threads have higher strength when subjected to high pressure. The ORB thread has a larger thread spacing and a smaller thread angle, making it more adaptable in low pressure environments.

In summary, American ORFS and ORB threads each have advantages in terms of applicable scenarios, characteristics, and specifications. When selecting threads, mechanical engineers should fully consider the specific needs of the equipment, including working pressure, environmental conditions, and other factors, to ensure the selection of appropriate thread types. On this basis, reasonable selection of thread specifications and materials can further improve the performance and reliability of the equipment, reduce failure rates, and extend the service life of the equipment.

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