ENGINEERING TOOL
Flange Weight Chart (DN15–DN300) — GB/T 9124.1-2019, Weld Neck & Plate
Family index of the flange weight charts: for every DN from DN15–DN300 the table gives the pipe outside diameter, the flange outside diameter, the bolt circle and the bolt holes on the weld neck flange PN16 basis, plus the unit weight of the carbon steel flange — the same table values as the per-size pages, where each size opens with PN10/PN16 toggle, plate flange and gasket weights.
Full PDF
Download the full PDF (DN15–DN300, all sizes)
Printable chart covering every size in this family — enter your email to get it.
Size Index (DN15–DN300, weld neck {pn})
Click a size for its dedicated chart (PN10/PN16 toggle, weld neck + plate flange dimensions, four-family weight matrix and 304/316L density conversion). Pipe OD / D / K in mm; holes = number × hole diameter.
| Size | Pipe OD (mm) | Flange OD D (mm) | Bolt circle K (mm) | Holes n × L (mm) | Unit weight, carbon steel (kg) |
|---|---|---|---|---|---|
| DN15 | 21.3 | 95 | 65 | 4 × 14 | 0.768 |
| DN20 | 26.9 | 105 | 75 | 4 × 14 | 1.09 |
| DN25 | 33.7 | 115 | 85 | 4 × 14 | 1.3 |
| DN40 | 48.3 | 150 | 110 | 4 × 18 | 2.15 |
| DN50 | 60.3 | 165 | 125 | 4 × 18 | 2.53 |
| DN80 | 88.9 | 200 | 160 | 8 × 18 | 3.92 |
| DN100 | 114.3 | 220 | 180 | 8 × 18 | 4.62 |
| DN150 | 168.3 | 285 | 240 | 8 × 22 | 7.4 |
| DN200 | 219.1 | 340 | 295 | 12 × 22 | 11.5 |
| DN300 | 323.9 | 460 | 410 | 12 × 26 | 22.1 |
Basis & Disclosed Assumptions
Where the numbers come from
- Dimensions and weights are the table values of GB/T 9124.1-2019 for the weld neck flange at PN16, for carbon steel — the same single source as the per-size pages and the product catalog, so the values can be cross-checked.
- Stainless grades are converted by density ratio rather than re-tabulated: 304 and 316L scale from the carbon steel value, so a size that is fine in carbon steel may be quoted differently in stainless.
- The index shows one family member and one pressure class so that a single row is comparable across sizes. Plate flanges, gaskets and the other pressure class are on the size pages.
Scope & limits
- Flange weights are catalogue table values, not estimates; they still exclude welding-neck build-up, coating and machining allowance.
- PN10 and PN16 differ mainly from DN200 upward; at the small sizes the two classes share the same dimensions and weight, which is why a row here can match the same value on both class pages.
- Use these values for quotation, freight and packing budgets. For lifting, rigging or structural attachment, work from the ordered drawing and its material certificate.
References
- GB/T 9124.1-2019 — Steel pipe flanges: PN-designated flanges (CN national standard)
- Dimensions cross-checked against industry flange data libraries; densities are common industry values
Other DN, PN, material or a whole order?
The weight calculator covers flanges and gaskets with DN, pressure class and material inputs, plus plate flanges and the gasket families, and returns unit, batch and pieces-per-tonne weights in one pass.
Open the weight calculatorCite this chart
YAXIIO. Flange Weight Chart (DN15–DN300) — GB/T 9124.1-2019, Weld Neck & Plate. https://www.yaxiio.com/en/tools/flange-weight-chart (accessed 2026-10-28).
Free to cite and embed — attribution required: “YAXIIO” + a link to this page.
FAQ
What are the PN16 weld neck flange dimensions for DN100?
DN100 on the PN16 weld neck basis: pipe outside diameter 114.3 mm, flange outside diameter 220 mm, bolt circle 180 mm, 8 bolt holes of 18 mm — unit weight about 4.62 kg in carbon steel. Turning on the PN10 toggle on the size page shows the other class side by side.
How much lighter is a flange in 304 or 316L than in carbon steel?
Geometry is unchanged, so only the density ratio applies: a 304 flange weighs slightly less than the carbon steel value in this table, and 316L slightly more, in proportion to their densities against 7.85 g/cm³. The size page shows the converted numbers in the weight matrix, so you do not have to do the arithmetic.
Next: work out your order, or pick the size by standard
Related References
Bolt Weight Calculator
Flange and gasket unit weights by DN, pressure class and material — piece, batch and pieces-per-tonne in one pass.
Gasket Size Chart
The mating side: DN × PN reverse lookup, PN ↔ Class conversion and gasket unit weight on the same DN axis.
U-Bolt Size Chart
Pipe-clamping U-bolts indexed by the same DN pipe sizes — inside width, leg, height and thread.
Weld Neck Flange Product Catalog
GB/T 9124.1-2019 / DIN 2633 / EN 1092-1 weld neck flanges — request a quote by DN, PN and material.
Disclaimer: this chart provides catalogue reference values for selection, quotation and freight budgeting only; it is not a design basis or an acceptance standard.