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What is Weld Neck Flange? Uses, Dimension and Types

Weld Neck Flange

Weld neck flanges, also known as welding neck flanges, are one of the most commonly used types of pipe flanges in the industrial and commercial sectors. They are designed for use with pipes to create a secure connection that is both reliable and leak-proof. In this blog post, we will discuss what weld neck flanges are, how they are used, and the different types available.

What is Weld Neck Flange?

Weld neck flanges are used to connect pipes together and provide an airtight seal. They consist of two parts—the pipe stub end that is welded onto the pipe itself and the slip-on welding collar that fits over the stub end on the outside. The collar is then secured onto the stub end using bolts or screws. This creates a secure connection between two pipes that can withstand high pressures without leaking or cracking. Additionally, weld neck flanges have a lip around their outer edge which helps to prevent leaks as well as improve their overall strength and durability.

Weld Neck Flanges Uses

Weld neck flange connections are often found in industrial applications where they are used to join pipes together in order to create larger structures such as boilers or tanks. They can also be used for connecting pumps, valves, and other pieces of equipment together. Additionally, they can be found in commercial applications such as plumbing systems, where they may be used for joining water lines together or creating drainage systems.

Weld Neck Flanges Types

There are several different types of weld neck flanges available depending on your needs and application requirements. These include full face (FF) weld neck flanges; raised face (RF) weld neck flanges; threaded (NPT) weld neck flanges; lap joint (LJ) weld neck flanges; socket (SW) weld neck flanges; blind (BL) weld neck flanges; and reducing (RX) weld neck flanges well as many others. Each type has its own specific uses, so it’s important to choose the right one for your application in order to ensure optimal performance and safety standards are met.

Weld Neck Flange Dimension

Weld Neck Flange Dimension

CLass 150 300 600 900 1500 2500
DIA A 30 38 38 38 38 43
DIA D 90 95 95 120 120 135
THK B 11.2 14.3 20.7 28.7 28.7 36.6
DIA G 35.1 35.1 35.1 35.1 35.1 35.1
DIA K 60.3 66.7 66.7 82.6 82.6 88.9
H 47.6 52.6 58.4 66.4 66.4 79.4
NO. L 4 4 4 4 4 4
DIA L 15.9 15.9 15.9 22.2 22.2 22.2


Welding Neck Flange connections provide a reliable seal between two pipes while still being able to withstand high-pressure levels without leaking or cracking under stress. There are several different types available depending on your application needs ranging from full face to threaded or lap joint styles. By choosing the right type for your application, you can ensure optimal performance as well as adhere to safety standards when building structures such as boilers or tanks with multiple connection points relying on this type of connection point. With proper installation and care, these connections can last for many years, providing you with reliable service throughout your lifetime!

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What is Weld Neck Flange? Uses, Dimension and Types

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