Flange Dimensions
Chart
Flange dimensions, bolt circle and pressure class information per ASME B16.5 and EN 1092-1 standards.
Flange Dimension Lookup
Selected Size: NPS 2" (DN50) | Standard: ASME B16.5
| Pressure Class | OD mm | Thickness mm | PCD mm | Bolt Qty | Bolt Size |
|---|---|---|---|---|---|
| Class 150 | 152 | 19 | 120.7 | 4 | M16 |
| Class 300 | 165 | 22 | 127 | 8 | M16 |
| Class 600 | 165 | 26 | 127 | 8 | M16 |
| Class 900 | 216 | 35 | 165.1 | 8 | M22 |
| Class 1500 | 216 | 38 | 165.1 | 8 | M22 |
| Class 2500 | 235 | 51 | 177.8 | 8 | M26 |
* Values are given for Weld Neck (WN) flange type. For other types (Slip-On, Blind, etc.) please contact us.
Pressure Classes & Flange Types
Pressure Classes (ASME)
* Actual working pressure varies based on material and temperature.
PN Ratings (EN 1092-1)
* PN: Nominal Pressure - maximum working pressure at 20C reference temperature (bar).
Common Flange Types
Weld Neck (WN)
Butt-welded to pipe. Ideal for high pressure and temperature.
Slip-On (SO)
Slides over the pipe and is welded. Easy installation, for low pressure.
Blind (BL)
Used to close pipe ends. Has no bore opening.
Socket Weld (SW)
For small-bore pipes. Pipe is inserted into the socket and welded.
Threaded (TH)
Threaded connection. Ideal for environments where welding is not possible.
Lap Joint (LJ)
Used with stub end. Preferred in frequently disassembled lines.
Need Flanges?
Contact us for flange supply in all pressure classes per ASME B16.5 and EN 1092-1 standards.
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