Piping
Flange dimensions
In short
For a pipe and a pressure rating, the calculation reads the flange connecting dimensions from the EN 1092-1 (PN 10 to 40) or ASME B16.5 (class 150 and 300) tables: outside diameter D, bolt circle K, number and size of holes, bolts and nut wrench size. Hole pitch: p = K × sin(180° / n).
Calculation
Example calculated with the tool’s default values.
Inputs
- Standard
- EN 1092-1 (PN)
- Nominal pressure
- PN 16
- Pipe
- DN100 · 114.3 × 3.6 mm
- Number of joints
- 1
Results
- Bolting per flange
- 8 × M16 · 24 mm
Worked example
Every value in this section belongs to the example, calculated with the tool’s default values.
Other results of the example
- Flange OD
- 220.0 mm
- Bolt circle diameter
- 180.0 mm
- Number of holes
- 8
- Hole diameter
- 18.0 mm
- Bolt thread
- M16 × 2
- Wrench (across flats)
- 24.0 mm
- Raised face diameter
- 158.0 mm
- Studs or bolts for 1 joint(s)
- 8
- Nuts for 1 joint(s)
- 16
- ISO 4032 wrench size: old DIN 934 or EN 14399 nuts differ (e.g. M12: 19, M20 HV: 32). Check the supplied nut.
- No tightening torque: it depends on gasket, lubrication and stud grade (EN 1591-1, ASME PCC-1, gasket datasheet).
Step-by-step calculation
Table lookup
EN 1092-1 PN 16 DN 100
D 220.0 ; K 180.0 ; 8 × Ø 18.0 ; M16
Hole pitch (chord)
p = K × sin(180° / n)
180.0 × sin(22.50°) = 68.9 mm
EN 1092-1 PN 16: full series
| Size | Pipe OD (mm) | Flange OD (mm) | Bolt circle (mm) | Holes | Bolt | Wrench |
|---|---|---|---|---|---|---|
| DN 10 | 17.2 | 90.0 | 60.0 | 4 × Ø 14.0 | M12 | 18 mm |
| DN 15 | 21.3 | 95.0 | 65.0 | 4 × Ø 14.0 | M12 | 18 mm |
| DN 20 | 26.9 | 105.0 | 75.0 | 4 × Ø 14.0 | M12 | 18 mm |
| DN 25 | 33.7 | 115.0 | 85.0 | 4 × Ø 14.0 | M12 | 18 mm |
| DN 32 | 42.4 | 140.0 | 100.0 | 4 × Ø 18.0 | M16 | 24 mm |
| DN 40 | 48.3 | 150.0 | 110.0 | 4 × Ø 18.0 | M16 | 24 mm |
| DN 50 | 60.3 | 165.0 | 125.0 | 4 × Ø 18.0 | M16 | 24 mm |
| DN 65 | 76.1 | 185.0 | 145.0 | 8 × Ø 18.0 | M16 | 24 mm |
| DN 80 | 88.9 | 200.0 | 160.0 | 8 × Ø 18.0 | M16 | 24 mm |
| DN 100 | 114.3 | 220.0 | 180.0 | 8 × Ø 18.0 | M16 | 24 mm |
| DN 125 | 139.7 | 250.0 | 210.0 | 8 × Ø 18.0 | M16 | 24 mm |
| DN 150 | 168.3 | 285.0 | 240.0 | 8 × Ø 22.0 | M20 | 30 mm |
| DN 200 | 219.1 | 340.0 | 295.0 | 12 × Ø 22.0 | M20 | 30 mm |
| DN 250 | 273.0 | 405.0 | 355.0 | 12 × Ø 26.0 | M24 | 36 mm |
| DN 300 | 323.9 | 460.0 | 410.0 | 12 × Ø 26.0 | M24 | 36 mm |
| DN 350 | 355.6 | 520.0 | 470.0 | 16 × Ø 26.0 | M24 | 36 mm |
| DN 400 | 406.4 | 580.0 | 525.0 | 16 × Ø 30.0 | M27 | 41 mm |
| DN 450 | 457.0 | 640.0 | 585.0 | 20 × Ø 30.0 | M27 | 41 mm |
| DN 500 | 508.0 | 715.0 | 650.0 | 20 × Ø 33.0 | M30 | 46 mm |
| DN 600 | 610.0 | 840.0 | 770.0 | 20 × Ø 36.0 | M33 | 50 mm |
| DN 700 | 711.0 | 910.0 | 840.0 | 24 × Ø 36.0 | M33 | 50 mm |
| DN 800 | 813.0 | 1025.0 | 950.0 | 24 × Ø 39.0 | M36 | 55 mm |
How to use it
- Pick the standard: EN 1092-1 (PN) or ASME B16.5 (class).
- Pick the nominal pressure (PN 10, 16, 25 or 40) or the class (150 or 300).
- Pick the pipe: its outside diameter selects the flange.
- Enter the number of joints, for the bolting list.
- Read the bolting per flange: number of bolts, size and wrench.
Frequently asked questions
What are the flange dimensions in mm for DN 100 PN 16?
EN 1092-1 PN 16 DN 100 (pipe OD 114.3): flange OD D = 220 mm, bolt circle K = 180 mm, 8 holes of 18 mm, M16 × 2 bolts, 24 mm wrench, raised face 158 mm. Hole pitch: 180.0 × sin(22.50°) = 68.9 mm. One joint needs 8 studs or bolts and 16 nuts.
What are the flange dimensions for class 150?
ASME B16.5 class 150, NPS 4 (pipe OD 114.3): D = 228.6 mm, K = 190.5 mm, 8 holes of 19.1 mm, 5/8" studs (5/8"-11 UNC), raised face 157.2 mm, 3 1/2" stud length for a raised face, 1 1/16" wrench (ASME B18.2.2 heavy hex nut).
What are the flange dimensions for class 300?
ASME B16.5 class 300, NPS 4 (pipe OD 114.3): D = 254 mm, K = 200.1 mm, 8 holes of 22.3 mm, 3/4" studs, raised face 157.2 mm, 4 1/2" stud length for a raised face.
Is there a flange dimensions chart in mm for other sizes?
The PN 16 series runs from DN 10 to DN 800. A few rows: DN 50 (OD 60.3): D 165, K 125, 4 × 18, M16; DN 150 (OD 168.3): D 285, K 240, 8 × 22, M20, 30 mm wrench; DN 200 (OD 219.1): D 340, K 295, 12 × 22, M20. Values are in mm, read from Zickwolff and checked against RoyMech.
Does a PN 25 flange have its own drilling?
Not below DN 65: the standard then refers to the PN 40 dimensions, and the calculation takes the PN 40 row and says so. From DN 65 up, the PN 25 series has its own dimensions.
Limits
Indicative results. No tightening torque: it depends on gasket, lubrication and stud grade (EN 1591-1, ASME PCC-1, gasket datasheet). ISO 4032 wrench size for EN flanges: old DIN 934 or EN 14399 nuts differ, check the supplied nut. Stud length given for ASME only; EN 1092-1 publishes none.