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What is the difference between Slip On (SO) Flanges and Socket Weld (SW) Flanges?

What is the difference between Slip On (SO) Flanges and Socket Weld (SW) Flanges?

Slip-On flanges (SO flanges) and socket weld flanges (SW flanges) are both important components in piping systems, each with its own set of characteristics and uses. Let’s delve into the specifics of these two types of flanges to understand their differences and applications better.

Slip-On Flange (SO Flange):

Design and Structure: Slip-on flanges feature a slightly larger bore than the outer diameter of the pipe. These flanges slide over the pipe and are then welded in place. They have a low hub and connect by slipping over the pipe and are then welded both inside and outside to provide sufficient strength and prevent leakage.

Installation: One of the key advantages of slip-on flanges is their ease of installation. They are relatively simple to align and weld onto the pipe. However, they are not suitable for high-pressure applications.


1. Easy to align and weld.

2. Cost-effective.

3. Ideal for low-pressure systems.

4. Requires less space than other types of flanges.


Slip-on flanges are commonly used in applications where easy assembly and lower pressure containment are primary requirements. These include industries such as petrochemical, plumbing, and low-pressure hydraulic systems.

Socket Weld Flange (SW Flange):

Design and Structure: Socket weld flanges have a recessed area or socket into which the pipe is inserted. Once the pipe is inserted, fillet welds are applied from the outside to join the pipe to the flange.

Installation: SW flanges require more welding than slip-on flanges. However, they provide better fatigue resistance and strength due to the welding at the joint.


1. Offers better structural strength compared to slip-on flanges.

2. Suitable for higher pressure and temperature applications.

3. Resistant to deformation and leakage under high pressure.


Socket weld flanges are favored in high-pressure systems, particularly those that deal with high temperatures and corrosive substances. Industries such as oil and gas, chemical processing, and power generation often use socket weld flanges for their higher pressure containment capabilities.

Key Differences:

1. Installation Method: Slip-on flanges are easier to install compared to socket weld flanges, requiring less welding. Socket weld flanges demand more welding due to the socket joint.

2. Pressure Handling: Socket weld flanges are more suitable for high-pressure systems compared to slip-on flanges, which are ideal for lower pressure applications.

3. Strength and Resistance: Socket weld flanges typically offer better strength and resistance against deformation and leakage under high pressure compared to slip-on flanges.


In summary, the choice between Slip-On Flanges and Socket Weld Flanges depends on the specific requirements of the piping system—considerations such as pressure, temperature, ease of installation, and structural strength all play a significant role in determining the appropriate flange type to be used.

Bhansali Metalloys Inc is one of the leading Manufacturer, Exporters, and Suppliers of High Quality Slip-On Flanges all over in India. We are Manufacturer, Supplier and Dealer of various types of Flanges such as Slip-On Flanges, Blind Flanges, Weld Neck Flanges, Lap Joint Flanges, Socket Weld Flanges, Orifice Flanges, Threaded Flanges and many more. We are Slip-On Flanges Manufacturer in India. These Flanges are available in different grades and materials. We are Slip-On Flanges Manufacturer, Supplier, Dealer, and Exporter in India. We are Slip-On Flanges Supplier in India. Contact Us +919152160158 or email to for Slip-On Flanges price list.

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Each Stainless Steel Slip-On Flanges is otherwise designed based on the characteristics of the applying and additionally the pressure. Consequently, different industries use different Square Pipes. We also produce customized Slip-On Flanges Products at our factory as per our client’s requirements. For any types of Slip-On Flanges Price List Call on +91 9152160158 or drop an Email to |

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