Table of content
Introduction
Galvanized steel pipe is a type of steel pipe with a zinc coating on the surface. This type of steel pipe is mostly used in pipelines, fences and some structural applications. This article mainly introduces the size, weight and some general data of 25mm galvanized pipe.
There are different ways to express the size: the difference between metric and imperial units, that is, millimeters and inches. This article will also introduce these two ways of expression and how to convert them to each other.
In 25mm galvanized pipe, 25mm usually refers to the nominal inner diameter. What is its corresponding weight? Its weight is mainly related to the wall thickness, and the wall thickness is generally divided into Class A, Class B, and Class C.
What Does “25mm GI Pipe” Mean?
In the conventional marking of pipes, 25mm usually refers to the nominal inner diameter or inner diameter. If converted to inches, it is about 1 inch. Usually, this mark also corresponds to the corresponding outer diameter, wall thickness and pressure level.
| Pipe Class | Nominal Bore | Outer Diameter | Wall Thickness |
|---|---|---|---|
| A (Light) | 25mm (1″) | ~33.4 mm | ~2.0 mm |
| B (Medium) | 25mm (1″) | ~33.4 mm | ~2.6 mm |
| C (Heavy) | 25mm (1″) | ~33.4 mm | ~3.2 mm |
The above size specifications are based on the IS1239 standard and similar GI specifications internationally.

Weight Chart for 25mm GI Pipe (Approximate Values)
| Pipe Class | Length (meters) | Weight per meter (kg/m) | Total Weight (kg) |
|---|---|---|---|
| A Class | 6 | 2.39 | 14.34 |
| B Class | 6 | 3.27 | 19.62 |
| C Class | 6 | 4.00 | 24.00 |
For example: Order 10 6-meter 25mm GI pipes (B-grade), the total weight is about 196.2 kg.
Why Pipe Weight Matters
1. Cost Calculation
GI pipes are usually priced per kg or per inch. Then knowing the corresponding weight can better calculate the price.
2. Structural Design
In the pipeline system, pressure bearing is also an important condition. The load bearing mainly depends on the wall thickness and weight of the pipe. Generally, C-grade standard pipes can be used more for high-pressure or outdoor pipeline systems.
3. Logistics and Handling
Correctly calculating the weight can make installation and transportation safer.

How to Convert Between mm and Inches
| Metric (mm) | Imperial (inch) |
|---|---|
| 15 mm | 1/2 inch |
| 20 mm | 3/4 inch |
| 25 mm | 1 inch |
| 32 mm | 1 1/4 inch |
| 40 mm | 1 1/2 inch |
| 50 mm | 2 inch |
25 mm is widely considered to be equivalent to 1 inch, so it can be converted in this way in pipeline systems around the world.
Where Is 25mm GI Pipe Commonly Used?
Household water supply system
Garden and greenhouse irrigation system
Structural frame
Fence
Air compressor pipeline
Among the pipe specifications, Class B is the most widely used.
Summary
The above mainly introduces the weight and size specifications of 25mm galvanized farmers and herdsmen. After understanding these contents, you can:
Choose a more suitable grade (A, B, C) according to your needs
Better calculation of steel pipes
Can convert between millimeters and inches
Ensure compatibility in the pipeline system
Therefore, when you make a specific choice, you can mainly refer to the above items to choose the right galvanized pipe. But when purchasing, you should also communicate with the supplier in time about the size specification table.



