Hydraulic SAE Flanges

SAE Flanges are designed to provide an alternative method of connecting a pipe, hose, tube or equipment. The leak free connection is suitable for high pressures, larger sizes and assembly in tight quarters. It has achieved worldwide standard acceptance.

It is made from normalized forging and the basic raw material is steel with carbon content lower than 0.30%. Alternatively, stainless steel SS316 or galvanized flange material is available. The complete set flange combine of flat face, oring face, oring groove, 4 washers and cap screws.

Size	3/8” to 5”
Material	Carbon Steel ST52.3/S355 Stainless Steel SS316L
Series	3000 6000
Connection Type	Threaded NPT Threaded BSPP Socket Weld (Weld in) Butt Weld (Weld on)
Configuration	SAE Flange Split Flange Flange Adaptor SAE Blind Flange

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Hydraulic SAE Flanges

SAE Split Flanges

SAE Blind Flanges

What are Hydraulic SAE Flanges

1. What are hydraulic SAE flanges use for?

The 4-bolt hydraulic sae flange connection conforms to SAE J518 and ISO 6162 standards. The flange has through holes for the mounting bolts and it has UNC or metric thread. The mounting holes of flat face are tapped while oring face doesn’t include.

There are various bolt grades that are paired to install in equipment:

Bolt grade 8.8: Yellow zinc as standard material supplied with carbon steel flange.
Bolt grade 10.9: FIZn 240h L suitable for high temperature application, available upon request.
Bolt grade SS304: Standard material supplied with stainless steel flange.
Bolt grade SS316: Higher corrosion resistance, available upon request.

Manufactured with two kinds of material, Steel (ST52.3) and Stainless Steel AISI SS316L, these are the two commonly used materials for SAE Flanges in hydraulic systems.

Steel ST52.3 is a low alloy, high strength structural steel, known for its excellent weldability and machinability. It is often used in the construction of hydraulic components due to its excellent mechanical properties and durability. ST52.3 are preferred in hydraulic systems which require components capable of withstanding high pressure and mechanical stress.
Stainless Steel SS316L is a low carbon variation of SS316, a molybdenum-bearing austenitic stainless steel. SS316L offers excellent corrosion resistance, making it ideal for use in harsh environments and applications where corrosion resistance is a concern. Its material resistance to corrosion ensures longevity and reliability in challenging conditions.

Steel 52.3

Made from low alloy, high tensile strength structural steel.
Good weldability and machinability.
Suitable for applications where high pressure and mechanical stress are required.

AISI SS316L

Made from austenitic stainless steel SS316L.
Excels in harsh environments or high moisture exposure.
Ideal for applications where corrosion resistance is critical.

2. What type of O-rings are used for hydraulic flanges?

It is a static face seal which uses a high durometer O-ring for the flange sealing. Metal-to-metal contacts at the outer face of the flange will cause leakage. Therefore, the O-ring sealing is compressed between the flat face and O-ring face providing a reliable soft sealing. Flanges use an O-ring to seal a joint and contain pressurized fluid.

O-Ring Side SAE Flange

The seals of flanges are available in the following materials:

Description	NBR 70/90	Viton 90
Equivalent	BUNA-N	FKM
Temperature Range (°C)	-34°C to 121°C	-26°C to 205°C
Recommended Application	Petroleum pols and fluids Cold Water Diesel fuel and fuel oils Mineral oil and grease Vegetable oil Silicone oil and grease	Petroleum pols and fluids Cold Water Silicone greases and oils Aromatic hydrocarbons Aliphatic hydrocarbons Fuels with methanol content
Non Recommended Application	Aromatic hydrocarbons Phosphate ester fluids Strong acids Automotive brake fluid	Ammonia gas, amines, alkalis Low molecular organism acids Superheated steam Glycol based brake fluids

3. What is the difference between code 61 and 62 flanges?

The ISO 6162 standard defines two primary types of flanges for hydraulic systems: the standard pressure series (Code 61) and the high-pressure series (Code 62). While both codes serve similar purposes, these flanges have distinct differences in terms of design, pressure ratings and applications.

SAE Flange code 61 features a flat face with four bolt holes and an O-ring groove, designed for lower pressure applications. The flat face design allows for easy assembly and disassembly of components. Commonly used in applications which require moderate pressure ratings are sufficient, such as in agricultural machinery, construction equipment, and industrial hydraulics.

Same as SAE Flange code 62, features a flat face with four bolt holes and an O-ring groove, designed for higher pressure applications. Cone seat design provides a metal-to-metal seal, suitable for demanding hydraulic systems. SAE Flange code 62 is commonly found in applications requiring high pressure ratings, such as in aerospace, marine and heavy machinery industries.

SAE Flange is designed in two difference code design and it is code 61 and 62. The summary table as per below:

Description	Code 61	Code 62
Series	3000	6000
Size	3/8” to 5”	3/8” to 3”
Working Pressure (bar)	34 to 345	414

Difference Between Code 61 & Code 62

Pressure Ratings

Code 61 SAE Flanges are designed for use in lower to moderate pressure hydraulic systems, where pressure ratings range from 35 to 350 bar (500 to 5000 PSI). While SAE Flange Code 62 pressure rating ranges exceed 350 bar (5000 PSI) and can go up to 420 bar (6000 PSI).

Seal Type

Both SAE Flange Code 61 and Code 62 include an O-ring groove and utilize an O-ring seal for sealing. The bolts or screws used to attach the SAE flange are tightened to a specified torque, which compresses the O-ring and ensures that it forms a complete seal around the connection. This compression also enhances the sealing capability of the flat face by ensuring even contact and minimizing the risk of leakage

Construction and Dimensions

SAE Flange code 62 typically has a more robust construction and slightly larger dimensions compared to code 61, reflecting its higher pressure capabilities.

4. How are SAE flanges attached to pipe?

Hydraulic SAE flange provides a zero-clearance assembly that enables easy connection, disconnect and maintenance of tube to hose, tube to tube or manifold connection. Infinite positioning is a built-in feature to enable flange to put in different position angle. There are several types of connection: threaded end (NPT or BSPP) and welding end (socket weld or butt weld).

The connection of welding and threaded is able to maximize reliability. However, it is inevitable that connections must be removed to allow replacing or servicing on system components. To improve flanges productivity, flanges have advanced considerably before installation to improve performance, installation convenience but still remain overall function effectiveness and efficiency.

5. What is the purpose of a SAE flange?

A simple SAE flange installation design provides several advantages:

Ability to connect pipe size up to 5 inch.
Single seal point between pipe or system assembly.
Much lower tightening torque required from the four bolts compared to other types of flange with equivalent size
Ease of disassembly through use of split flange.

6. How do you install a SAE flange?

There are 4 simple steps to install SAE flange?

Step 1: Check components surface and ensure there are no damage or contamination.

Step 2: Align the flange connection before inserting the O-ring seal on the female flange groove. Place the washer with cap screws and bolt through the bolt holes.

Step 3: Hand tighten cap screws to seat O-ring on flange groove.

Step 4: Ensure the tighten process meets the torque value below:

Flange Size	Screw Thread	Screw Torque (NM)*
1/2"	M8	32
3/4"	M10	70
1"	M10	70
1 1/4"	M10	70
1 1/2"	M12	130
2"	M12	130
2 1/2"	M12	130
3"	M16	295
3 1/2"	M16	295
4"	M16	295
5"	M16	295

Flange recommended Torque Value Table Series 3000 Code 61

Flange Size	Screw Thread	Screw Torque (NM)*
1/2"	M8	32
3/4"	M10	70
1"	M12	130
1 1/4"	M12	130
1 1/2"	M16	295
2"	M20	550
2 1/2"	M24	550
3"	M30	650

Flange recommended Torque Value Table Series 6000 Code 62

To watch how to install sae flange video, please click this link.

FAQs

What is a hydraulic SAE Flange?

A hydraulic SAE Flange is a specialized flange designed to connect hydraulic components such as hoses, pipes, valves, and pumps in hydraulic systems.

What are the main components of a hydraulic SAE Flange?

The main components of a hydraulic SAE Flange includes the flange itself, bolts and washers, and a sealing mechanism such as an O-Ring or Gasket.

What are hydraulic SAE Flanges used for?

Hydraulic SAE Flanges are used to create a secure and leak-free connection between hydraulic components, ensuring efficient and reliable operation of hydraulic systems.

How do hydraulics SAE Flanges differ from other types of flanges?

Hydraulic SAE Flanges are specifically designed for hydraulic applications and adhere to SAE standards for dimensions and performance, ensuring compatibility and interchangeability between components.

What are the different types of hydraulic SAE Flanges available?

There are various types of hydraulic SAE Flanges, including code 61 and code 62 flanges, which are SAE 3000 PSI flanges, and SAE 6000 PSI flanges, each with different pressure rating, suitable for different pressure requirements. Also it comes with four types of difference connections, socket weld, butt weld, NPT, and BSPP.

How do I select the right hydraulic SAE Flange for my application?

The selection of a hydraulic SAE Flange depends on factors such as the pressure rating, size, and compatibility with other components in the hydraulic system. Consulting manufacturer specifications and guidelines is recommended.

What are the benefits of using hydraulic SAE Flanges?

The benefits of using hydraulic SAE Flanges include secure connections, leak prevention, ease of installation, and compatibility with standardized components.

Can hydraulic SAE Flanges be reused?

Yes, hydraulic SAE Flanges can typically be reused if they are undamaged and properly inspected during reassembly.

Are hydraulic SAE Flanges compatible with different hydraulic fluids?

Yes, hydraulic SAE Flanges are compatible with a wide range of hydraulic fluids, including mineral oil, synthetic fluids, and water based fluids.

What maintenance is required for hydraulic SAE Flanges?

Regular inspection for leaks, proper torquing of bolts, and replacement of seals or gaskets as needed are important maintenance tasks for hydraulic SAE Flanges.

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