Pipex Ai is the B2B portal trusted by industrial professionals for sourcing top-quality flanges and pipe fittings built for strength, precision, and reliability. One of our core offerings is the weld neck flange, a highly durable flange designed for high-pressure, high-temperature applications.
Weld neck flanges are distinguished by their long tapered hub and butt-welded connection, which transfers stress to the pipe and reduces the risk of failure. This design provides superior strength, making it ideal for systems under extreme mechanical or thermal strain. These flanges are widely used in industries such as oil & gas, petrochemical, power generation, and shipbuilding.
The tapered neck also allows for easy radiographic inspection and enhances the structural integrity of the connection, which is especially important in critical systems. Weld neck flanges are compatible with a range of pipe sizes and materials, including stainless steel, carbon steel, and alloy steel, and are available in pressure classes from 150 to 2500 as per ASME B16.5 and other international standards. Understanding the weld neck flange Weight Chart in kg before procurement or installation is crucial, as these flanges are typically heavier and bulkier than other types.
Importance of the Weight Chart in Weld Neck Flange Selection
A weld neck flange Weight Chart in kg pdf provides standardized, pre-calculated weight values based on size and pressure class, helping engineers and procurement teams plan more efficiently. These charts are especially useful when space or weight limits are critical, reducing the chances of mismatch, delays, or safety issues during installation. At Pipex.ai, we offer accurate, up-to-date weight chart data for every flange product, helping clients manage procurement, logistics, and assembly with confidence and ease.
Standard Weight Chart for Weld Neck Flanges – Class 150 (Stainless Steel)
NPS (inches) | Outside Diameter (mm) | Thickness (mm) | Approx. Weight (kg) |
1" | 108 | 12.7 | 1.90 |
2" | 152 | 15.9 | 4.50 |
3" | 190 | 19.1 | 8.20 |
4" | 229 | 23.9 | 13.40 |
6" | 279 | 25.4 | 21.80 |
8" | 343 | 28.4 | 37.00 |
10" | 406 | 30.2 | 58.20 |
12" | 483 | 31.8 | 83.40 |
Weight Chart for Weld Neck Flanges – Class 300 (Carbon Steel)
NPS (inches) | Outside Diameter (mm) | Thickness (mm) | Approx. Weight (kg) |
2" | 165 | 22.4 | 6.30 |
4" | 229 | 28.4 | 15.80 |
6" | 279 | 33.3 | 29.50 |
8" | 343 | 38.1 | 51.10 |
10" | 406 | 46.0 | 80.30 |
12" | 483 | 50.8 | 115.60 |
Note: All values are approximate and may vary slightly based on material and finish.
In today’s competitive B2BMarketplace, technical accuracy is just as important as product availability. That’s why Pipex Ai supports B2B buyers not only with high-quality flanges but also with the data they need to make smart, fast, and confident decisions.
Weld neck flanges are built for performance under pressure, and their design makes them one of the most reliable options for high-demand pipelines. But selecting the right flange goes beyond dimensions—it also requires knowing the weight. With the right weight chart, buyers avoid guesswork and ensure proper planning from start to finish.
Pipex Ai makes this process easier by combining product expertise with verified data—supporting every B2B buyer through smart sourcing.