Flange dimensions (EN 1092-1)
Dimension tables for flanges per EN 1092-1: outside diameter (D), bolt circle (K), number and size of bolts per nominal size and pressure rating – plus DN-inch and PN-Class conversion. Typical values for orientation.
Flange dimensions PN 6
| DN | Outside Ø D (mm) | Bolt circle K (mm) | Bolts (n × size) |
|---|---|---|---|
| DN 15 | 80 | 55 | 4 × M10 |
| DN 20 | 90 | 65 | 4 × M10 |
| DN 25 | 100 | 75 | 4 × M10 |
| DN 32 | 120 | 90 | 4 × M12 |
| DN 40 | 130 | 100 | 4 × M12 |
| DN 50 | 140 | 110 | 4 × M12 |
| DN 65 | 160 | 130 | 4 × M12 |
| DN 80 | 190 | 150 | 4 × M16 |
| DN 100 | 210 | 170 | 4 × M16 |
| DN 125 | 240 | 200 | 8 × M16 |
| DN 150 | 265 | 225 | 8 × M16 |
Flange dimensions PN 10 / PN 16
| DN | Outside Ø D (mm) | Bolt circle K (mm) | Bolts (n × size) |
|---|---|---|---|
| DN 15 | 95 | 65 | 4 × M12 |
| DN 20 | 105 | 75 | 4 × M12 |
| DN 25 | 115 | 85 | 4 × M12 |
| DN 32 | 140 | 100 | 4 × M16 |
| DN 40 | 150 | 110 | 4 × M16 |
| DN 50 | 165 | 125 | 4 × M16 |
| DN 65 | 185 | 145 | 4 × M16 |
| DN 80 | 200 | 160 | 8 × M16 |
| DN 100 | 220 | 180 | 8 × M16 |
| DN 125 | 250 | 210 | 8 × M16 |
| DN 150 | 285 | 240 | 8 × M20 |
DN – inch (NPS)
| DN | Inch (NPS) |
|---|---|
| DN 10 | 3/8" |
| DN 15 | 1/2" |
| DN 20 | 3/4" |
| DN 25 | 1" |
| DN 32 | 1¼" |
| DN 40 | 1½" |
| DN 50 | 2" |
| DN 65 | 2½" |
| DN 80 | 3" |
| DN 100 | 4" |
| DN 125 | 5" |
| DN 150 | 6" |
| DN 200 | 8" |
| DN 250 | 10" |
| DN 300 | 12" |
| DN 350 | 14" |
| DN 400 | 16" |
| DN 500 | 20" |
| DN 600 | 24" |
PN – Class (correspondence)
| PN (EN 1092-1) | Class (ASME) |
|---|---|
| PN 10 / PN 16 | ≈ Class 150 |
| PN 25 / PN 40 | ≈ Class 300 |
| PN 63 | ≈ Class 400 |
| PN 100 | ≈ Class 600 |
| PN 160 | ≈ Class 900 |
| PN 250 | ≈ Class 1500 |
| PN 420 | ≈ Class 2500 |
Frequently asked questions on flange dimensions
How many bolts does a DN 100 PN 16 flange have?
A DN 100 PN 16 flange (EN 1092-1) has 8 × M16 bolts, outside Ø 220 mm, bolt circle 180 mm.
Do PN 10 and PN 16 share the same drilling?
Yes, up to DN 150 PN 10 and PN 16 are dimensionally identical per EN 1092-1 – same outside Ø, bolt circle and bolt pattern.
Looking for the right flange?
Type, size, pressure rating, sealing face and material are enough – we supply the right flange, on request with an EN 10204 3.1 / 3.2 mill certificate.
All data are typical values per EN 1092-1 / DIN / ASME for first orientation – without warranty. Please ask for the availability of individual sizes and pressure ratings. The applicable standard and the order confirmation are decisive.