20 inch ASME B16.5 Class 300 Flange Dimensions
20 inch (DN 500) to ASME B16.5: OD 775 mm; thickness 62.0 mm; raised face 584.2 mm; hub 587 mm; pipe OD 508.0 mm.
Key to dimensions
- O
- Outside diameter of flange
- tf
- Minimum flange thickness (also the blind flange thickness), excluding the raised face
- R
- Diameter of raised face
- X
- Hub diameter at base
- A
- Hub diameter at the welding end of a weld neck flange (pipe outside diameter)
- Y
- Length through hub — given separately for weld neck, slip-on / threaded / socket weld and lap joint flanges
- W
- Bolt circle diameter
- Holes
- Number and diameter of bolt holes
- Bolt
- Nominal bolt diameter in inches
20 inch ASME B16.5 Class 300 Flange Dimensions — all dimensions
Class 300 flange dimensions (mm)
| Dimension | Value | Equivalent |
|---|---|---|
| DN | 500 | |
| Outside dia — O | 775 mm | 30.51 in |
| Min thickness — tf | 62.0 mm | 2.44 in |
| Raised face dia — R | 584.2 mm | 23.00 in |
| Hub dia — X | 587 mm | 23.11 in |
| Hub at weld — A | 508.0 mm | 20.00 in |
| Weld neck — Y | 160 mm | 6.30 in |
| Slip-on / Thr / SW — Y | 94 mm | 3.70 in |
| Lap joint — Y | 140 mm | 5.51 in |
| Bolt circle — W | 685.8 mm | 27.00 in |
| Number of holes | 24 | |
| Hole dia | 34.9 mm | 1.37 in |
| Bolt size | 1¼" |
Class 300 bolting and approximate weights
| Dimension | Value | Equivalent |
|---|---|---|
| Number of studs | 24 | |
| Stud dia | 1¼" | |
| Stud length — Raised face | 205 mm | 8.07 in |
| Stud length — Ring joint | 220 mm | 8.66 in |
| Weld neck — kg, approx. | 167 kg | 368.2 lb |
| Slip-on — kg, approx. | 136 kg | 299.8 lb |
| Blind — kg, approx. | 223 kg | 491.6 lb |
Values are nominal, from ASME B16.5 Class 300 Flange Dimensions. Verify critical dimensions against the current edition of the standard before design, purchase or fabrication.
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20 inch ASME B16.5 Class 300 Flange Dimensions: common questions
What are the 20 inch ASME B16.5 Class 300 Flange Dimensions?
20 inch (DN 500) to ASME B16.5: OD 775 mm; thickness 62.0 mm; raised face 584.2 mm; hub 587 mm; pipe OD 508.0 mm.
Does Teshi Group manufacture 20 inch flanges?
Yes. Teshi Group is an OEM manufacturer in India of flanges to ASME B16.5, in carbon, alloy, stainless, duplex, super duplex, nickel alloys, titanium and Cu-Ni, with EN 10204 3.1 certificates.
Can I download the 20 inch dimensions as a PDF?
Yes. Use “Download PDF for this size” on this page to get a single-size, print-ready PDF with the drawing and every tabulated dimension, or download the full ASME B16.5 Class 300 Flange Dimensions chart.
Need 20 inch flanges?
Teshi Group manufactures them in India — send your size, rating and material and get a quote in 24–48 hours.
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