DIN weld neck flanges, PN 25
Every size in the table, in mm, with a 3D model drawn from the same figures. See weld neck flanges for materials, standards and the marking.
3D model
DN 350 PN 25 weld neck
Key dimensions in mm, DIN 2634
- D
- Flange diameter
- 555
- b1
- Flange thickness
- 38
- d1
- Weld end diameter, series 1
- 355.6
- d1
- Weld end diameter, series 2
- 368
- d3
- Hub diameter, series 1
- –
- d3
- Hub diameter, series 2
- 398
- s
- Wall thickness
- 8
- r1
- Radius
- 12
- h1
- Length through hub
- 100
- h3
- Length
- 20
- d4
- Raised face diameter
- 450
- f
- Raised face height
- 4
- k
- Bolt circle (PCD)
- 490
- d2
- Bolt hole diameter
- 33
- Thrd
- Bolt thread
- M 30
- n
- Number of holes
- 16
- kg
- Weight, approx.
- 47.2
Dimensions
Swipe the table sideways for every column. Choose a size to show it in the viewer.
| DNSize | DFlange diameter | b1Flange thickness | d1Weld end diameter (1) | d1Weld end diameter (2) | d3Hub diameter (1) | d3Hub diameter (2) | sWall thickness | r1Radius | h1Length through hub | h3Length | d4Raised face diameter | fRaised face height | kBolt circle (PCD) | d2Bolt hole diameter | ThrdBolt thread | nNumber of holes | kgWeight, approx. | Enquiry list |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 360 | 30 | 219.1 | not listed | not listed | 244 | 6.3 | 10 | 80 | 16 | 278 | 3 | 310 | 26 | M 24 | 12 | 17 | ||
| 425 | 32 | 273 | 267 | 298 | 292 | 7.1 | 12 | 88 | 18 | 335 | 3 | 370 | 30 | M 27 | 12 | 24.4 | ||
| 485 | 34 | 323.9 | not listed | not listed | 352 | 8 | 12 | 92 | 18 | 395 | 4 | 430 | 30 | M 27 | 16 | 31.2 | ||
| 555 | 38 | 355.6 | 368 | not listed | 398 | 8 | 12 | 100 | 20 | 450 | 4 | 490 | 33 | M 30 | 16 | 47.2 | In the viewer | |
| 620 | 40 | 406.4 | 419 | not listed | 452 | 8.8 | 12 | 110 | 20 | 505 | 4 | 550 | 36 | M 33 | 16 | 61.7 | ||
| 730 | 44 | 508 | not listed | not listed | 558 | 10 | 12 | 125 | 20 | 615 | 4 | 660 | 36 | M 33 | 20 | 89.6 |
Dimensions in mm, for reference. Tolerances and full requirements as per the applicable standard. Confirm against your specification before ordering.
Source: Shiv Shakti Machine Tools Flange Catalogue, edition 2026 (draft), page 13. “–” means the catalogue lists no value.
[CONFIRM: table checked and signed off by the owners (unverified)][CONFIRM: whether the flange thickness includes the raised face]