What are the Pressure Ratings for different SAE Flanges?

Sae flange, Code 61 flange, Code_62_flange Younglee manufacturer

SAE Flanges are usually forged flanges designed to standard SAE J518C and ISO 6162. They are mostly used in hydraulic systems and high pressure applications. So what are the working pressures for different sizes of SAE hydraulic flanges?

There are two different series divided by the pressure ratings, which are:

  • Pressure 3000 psi series

SAE Flanges of 3000 psi series usually are known as code 61 flanges, and sometimes they are called SAE 3000 flanges or SAE flange class 3000.

3000 psi SAE flanges are designed according to standard ISO 6162-1.

Here below is the chart shows the specific working pressure of the different sizes of SAE 3000 flanges:

Working Pressure of SAE Flanges CODE 61 SAE J518-1 / ISO 6162-1
Inch SizeMax Working PressureGrade 8 and Equivalent Fastener Torque Value
PSIMPaSocket Head UNC (lb-ft)Hex Head UNC (lb-ft)
1 1/4”4000286852
1 1/2”30002111180
2 1/2”250017.511180
3 1/2”5003.5218160

  • Pressure 6000 psi series

Hydraulic SAE Flanges of 6000 psi series usually are known as code 62 flanges, and sometimes they are called SAE 6000 flanges or SAE flange class 6000.

6000 psi SAE flanges are designed according to standard ISO 6162-2.

Here below is the chart shows the specific working pressure of the different sizes of hydraulic flanges SAE class 6000:

Working Pressure of Hydraulic flanges CODE 62 SAE J518-2 / ISO 6162-2
Inch SizeMax Working PressureGrade 8 and Equivalent Fastener Torque Value
PSIMPaSocket Head UNC (lb-ft)Hex Head UNC (lb-ft)
1 1/4”60004011180
1 1/2”600040218160

High Purity Stainless Steel Tubing | High Purity Gas Tube

High Purity Stainless Steel Tubing | High Purity Gas Tube | High Purity Pipe Fittings

High purity stainless steel tubing is widely used in various industries where high purity, high cleanliness, and high performance are critical required, such as semiconductor industry, sports, pharmaceuticals, laboratory engineering, high purity gas industry, and more. As mostly this kind of tubing is mostly used to deliver various kinds of high purity gas for different applications, it is also known as high purity gas tubing as well.

As one of the top quality China precision stainless steel tube manufacturers, Younglee produces and supplies high purity tubes in a wide range of metric sizes and imperial sizes. Our customers include many respected companies in China & oversea countries.

Details of high purity stainless steel tubing

Ultra High purity stainless steel tubing


We produce and supply high purity tubing in stainless steel of EN DIN steel grades and AISI /UNS steel grades.

AISI / UNS steel grades: 316 / 316L, 304 / 304 L, 316Ti, 2205, S31803

EN DIN steel grades: 1. 4401 / 1.4404 /1.4435, 1.4301 /1.4307, 1.4462

316L high purity tubing is the most popular, also we produce other materials of high purity tubes on customer’s requests.

Size Range:

Tubing metric size: O.D 6 mm to O.D 120 mm, W.T 0.5 mm to 10 mm

Imperial size tubes: O.D 1/4″ to 6″

The most popular size range of the high purity stainless steel tubing is between O.D 6 mm (1/4″) to O.D 50 mm (2″), and we can supply the high purity tubes with random length or fixed length 1 meter to 8 meters.

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How to choose, process and install hydraulic tubes properly?

Need hydraulic tubes? please contact: 

Hydraulic tubing manufacturer

How to choose, process, and install hydraulic tubes properly, in order to make the hydraulic line system work more energy-efficient, reliable, and have a longer life? This has become an important issue for hydraulic technologies. As one of the leading China hydraulic tube manufacturer and supplier, our company Younglee Metal specializes in manufacturing stainless steel hydraulic tubing and carbon steel hydraulic tubing for many years, and has many years experience of hydraulic tube related technology and research, we solved the hydraulic tube related technical issues for many customers, and provided production and technical services to them.

This article will briefly describe the hydraulic pipe selection, processing, installation, etc., with hope to help the customers in the hydraulic system industry who are in need.

Choose the right material and size of hydraulic tubes

The hydraulic tubes should be selected according to the system pressure, flow and application environment. Must pay attention to the strength of the tubing whether is enough, whether the pipe diameter and the wall thickness meet the system requirements, and the inner wall of the selected steel pipe must be smooth, non-corrosive, non-oxidized skin, no clips and other defects. If any of the following problems is found on the hydraulic tube, it cannot be used:

  1. the inner and outer walls of the hydraulic pipe have been heavily rusted;
  2. the scratch depth of the pipe body is more than 10% of the wall thickness;
  3. the surface of the pipe body is recessed to more than 20% of the pipe diameter;
  4. the wall thickness of the pipe section is uneven and the ellipticity is obvious.

In applications of medium and high pressure hydraulic systems, the seamless steel tubes are generally used, because they have the advantages as high strength, low price, and easy leak-free connection, it is widely used in hydraulic systems.


Stainless steel hydraulic tubes and hydraulic pipes

Ordinary hydraulic systems often use cold drawn low carbon steel tubes, because carbon steel hydraulic tubing can be reliably welded to various standard pipe fittings. And for applications where there is corrosion resistance is required, such as Hydraulic servo system, often use ordinary stainless steel seamless pipe, stainless hydraulic tubes are with corrosion resistance, smooth inner and outer surfaces, accurate size.

Regarding how to choose the right outside diameter and the wall thickness of the hydraulic tubes, we will talk in another blog article later.

Hydraulic Tubes processing, like Cutting, bending, welding


The processing of pipes mainly includes cutting, bending, welding and so on. The quality of the pipe processing has a great influence on the parameters of the pipeline system, and it is related to the reliable operation of the hydraulic system. Therefore, scientific and reasonable processing methods must be used to ensure the quality of processing.

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What is hydraulic ball valve?

Hydraulic ball valves are usually a kind of special stainless steel ball valves or carbon steel ball valves which are used in hydraulic industry, to control the fluid in the hydraulic systems.

Ball-valves, hydraulic-ball-valve, instrument-ball-valves-Younglee

As hydraulic ball valve is one sub category of the ball valves, so to explain what is hydraulic ball valve, we need to explain what is ball valve first.

What is ball valve?

Ball valves, as its name suggests, are stop valves that use a ball to stop or begin a stream of fluid. The ball (see in the below drawing) performs the exact same function as the disc in other types of valves. Since the valve handle is turned to open the valve, then the ball rotates into some stage where a part or all the hole through the ball is in line with the valve body enter port and export, permitting fluid to flow through the valve. After the ball has been rotated so the hole is perpendicular to the flow openings of the valve body, the flow of fluid ceases.

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What is Butt Weld Flange and its applications?

Butt weld flanges are widely used in different industries, this is one of the popular type of industrial flanges.Butt weld flanges-factory-manufacturer

The range of butt weld flange use is determined according to different characteristics. They are mostly used in the case of moderate medium conditions, such as low pressure non-purifying compressed air and low pressure circulating water. Its advantage is that the price is cheaper. Butt weld flanges are suitable for connection of steel pipes whose nominal pressure does not exceed 2.5MPa. The sealing surface of butt weld flanges can be made into three types of smooth, concave and convex. Smooth butt weld flange application of the largest amount, the other two methods of butt weld flange is also common in use.

Butt Weld flange is not easily deformed, with well sealed, so they are widely used. They have the corresponding rigid and elastic requirements and a reasonable butt welding thin transition, welding seam from the joint surface distance, so the joint will not be affected by the welding temperature deformation. They have a more complex body structure, so they are suitable for pressure or temperature fluctuations in the pipeline or high temperature, high pressure and low temperature pipe, generally used for PN greater than 2.5MPa pipe and valve connections; also used to transport prices Expensive, flammable, explosive medium on the pipeline.

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What is the reason of flange seal failure? How to prevent flange leakage?

Analysis of leakage of flange seal  and its Prevention 

Abstract: By analyzing the causes of leakage of flange seal, find out the prevention and solution.

Key words: flange  seal  leakage

Flange connection is widely used in the pipeline connection, such as  in gas, oil, water supply and drainage pipes. There many different types of flanges such as SAE flanges (code 61/62 flanges), Slip on flanges, Lapped flanges, Weld neck flanges, and so on.

As the leakage of flange seal can cause the transmission of materials, gas leakage, pollution, and even cause a major fire or personal injury accidents, it must pay attention to the flange seal. This paper analyzes the factors that cause leakage of flange  and puts forward the solution to the solution.

First, the flange

1,  Sealing surface of flange exists in several forms

(1) Flat sealing surface is a smooth plane, usually in the plane with 2-3 concentric groove, tighten the bolt, the gasket material is easy to both inside and outside the squeeze, not easy to compact, only for the pressure is not high , Non-toxic media, non-flammable and explosive occasions.

(2) The concave-convex sealing surface consists of a concave surface and a convex surface, this sealing surface gasket is easy to center, when compress it ,the gasket will not squeeze out.So it can be used for slightly higher pressure occasions.

(3) The tongue and groove sealing surface consists of a tenon and a groove surface, the gasket placed in the tank, will not be squeezed and moved, because the gasket is narrow, the gasket clamping force correspondingly smaller, its shortcomings is the complex of structure and manufacturing , replace the gasket is also more trouble. Generally used for flammable, explosive, toxic media and high pressure occasions.

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Inspection Instructions Of Sae Flange

This instruction is made by Younglee Metal Products Co.,Ltd, complied and implemented by quality department of its SAE Flange factory.


This instruction is intended to strengthen the quality management of flanges, making the quality inspection be processize, standardization, and improve the quality control level. Flanges should meet our factory inspection and testing standards, in addition to the implementation of the contract technical requirements. If there is a conflict between the requirements of the contract and this requirement, it shall perform the higher standard as required.

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Easily distinguishing tips between 304,304H and 304L

304,304H and 304L, What is the difference?

In fact, according to the content of chromium and nickel ,they are all 304 stainless steel, the composition is containing 18% chromium (Cr), 8% nickel (Ni), but the main difference is the percentage of carbon between them.

Stainless steel products you may be interested in:

304, 304L, 304H chemical composition (%) table

304L is ultra-low carbon stainless steel, the carbon content is down to 0.03% or less, to avoid intergranular corrosion, and the effect of stress corrosion resistance is better than 304 in theory, but in practice the effect is not obvious. Reducing the carbon and adding titanium can achieve the same effect, but adding titanium which is 321 stainless has higher smelting costs, the price is more expensive.

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Think you know stainless steel? Not enough

Stainless steel is widely used in various industries and our life. But do you think you know enough about stainless steel? Even if you are some engineer in the steel industry. Here I’d like to write an article of detailed introduction of stainless steel.

This article focuses on the types and characteristics of common stainless steels, as well as the main purpose.

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Highly recommended page to collect: Practical Guide for Duplex Stainless Steel Manufacturing (1)

The use of duplex stainless steel is becoming increasingly widespread, and users are becoming more familiar with this type of stainless steel. This article introduces the characteristics of duplex stainless steel, and gives the basic principles and practical information of processing and welding duplex stainless steel, which is one of the difficulties in the application of duplex stainless steel.

The contents include: the history of duplex stainless steel, metallurgical, corrosion resistance, mechanical properties, physical properties, technical conditions, quality control, cutting, forming, welding, application and so on.

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