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What is Square Tube Flange? Dimensions, Uses, and Types

Square Tube Flanges

Square tube flanges are crucial in various industrial applications, serving as essential components for constructing structures and facilitating plumbing tasks. These flanges provide vital support and stability, especially in projects utilizing square tubing, such as frameworks and handrails. They come in various types, including flat, corner, and base flanges, each tailored to meet specific structural needs. Welding is a commonly employed method for securely attaching square tube flanges, ensuring durability and reliability in demanding industrial environments. This article will provide an overview of square tube flanges, their uses and types, and how they can be welded.

What is Square Tube Flange?

A square tube flange is a component used in construction and engineering projects, typically made of metal or other sturdy materials. It’s designed to securely attach and support square tubing, providing stability and reinforcement at connection points. These flanges are commonly used in structures like handrails, frames, and support systems, ensuring proper alignment and strength where square tubing meets other elements.

Square Tube Flange Uses

Square tube flanges have many uses in different industries. They are commonly used in constructing bridges, buildings, and other large structures due to their strength and ability to create secure connections between two pieces of tubing without risking any leakage. Additionally, they are often found in plumbing applications such as water tanks and sewers because they can provide a tight seal when connected correctly. Finally, they can also be used in automotive applications such as exhaust systems, which help reduce vibration and noise levels.

Square Tube Flange Welding

Welding square tube flanges requires special tools and techniques to ensure that the connection is secure and leak-proof. The most common method for welding these types of flanges is called TIG (Tungsten Inert Gas) welding, which involves using heat generated from an electric arc to melt the metal together at the joint area. This process requires specialized equipment such as a TIG welder, tungsten electrodes, flux-cored wire, shielding gas, protective gear and a variety of other items depending on the specific application being done. Additionally, welders need to have experience with TIG welding before attempting this type of work, as it can be dangerous if not done correctly.

Square Tube Flange Types

Square tube flanges come in various sizes and materials depending on their intended use. Common materials include stainless steel, carbon steel, aluminum alloy or brass, while common sizes range from 1/4 inch to 6 inches depending on the application requirements. Additionally, there are also different types, such as threaded square tube flanges, which offer additional strength compared to regular ones due to having threads cut into them for added support when connecting two pipes; slip-on square tube flanges which require no additional bolting or fastening; lap joint square tube flanges which provide more flexibility than regular ones when connecting multiple pieces; socket weld square tube flanges which allow for easier installation than traditional ones; and blind square tube flanges which allow for easy access when working on internal piping systems without having to remove any components first.

Square Tube Flange Dimension

1/ 2 15 88.9 11.2 0.4 0.5 0.4
3/ 4 20 98.6 12.7 0.6 0.7 0.6
1 25 108 14.2 0.8 1 0.9
1 1/ 4 32 117.3 15.7 1 1.3 1.2
1 1/ 2 40 127 17.5 1.3 1.7 1.5
2 50 152.4 19.1 2.1 2.6 2.4
2 1/ 2 65 177.8 22.4 3.3 4.1 3.9
3 80 190.5 23.9 3.9 4.9 4.9
3 1/ 2 90 215.9 23.9 4.8 6.1 6.2
4 100 228.6 23.9 5.3 6.8 7.0
5 125 254 23.9 6.1 8.6 8.6
6 150 279.4 25.4 7.5 10.6 11.3
8 200 342.9 28.4 12.1 17.6 19.6
10 250 406.4 30.2 16.5 24 28.6
12 300 482.6 31.8 26.2 36.5 43.2
14 350 533.4 35.1 34.6 48.4 58.1
16 400 596.9 36.6 44.8 60.6 76.1
18 450 635 39.6 48.9 68.3 93.7
20 500 698.5 42.9 61.9 84.5 122.0
24 600 812.8 47.8 86.9 115 185.0


Square tube flanges have become increasingly popular among builders due to their versatility and strength when connecting two pipes together at angles that would otherwise be difficult or impossible with traditional methods alone. They come in various sizes and materials depending on their intended use while also offering different types such as threaded, slip-on lap joint socket welded or blind varieties that allow for greater flexibility when connecting multiple pipes securely without risking any leakage or vibration issues occurring during operation later down the line. If you’re looking for an efficient way of securely connecting two pipes, consider investing in some quality square tube flange supplies today!

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