18 inch ASME B16.5 Class 300 Flange Dimensions
18 inch (DN 450) to ASME B16.5: OD 710 mm; thickness 58.8 mm; raised face 533.4 mm; hub 533 mm; pipe OD 457.0 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
18 inch ASME B16.5 Class 300 Flange Dimensions — all dimensions
Class 300 flange dimensions (mm)
| Dimension | Value | Equivalent |
|---|---|---|
| DN | 450 | |
| Outside dia — O | 710 mm | 27.95 in |
| Min thickness — tf | 58.8 mm | 2.31 in |
| Raised face dia — R | 533.4 mm | 21.00 in |
| Hub dia — X | 533 mm | 20.98 in |
| Hub at weld — A | 457.0 mm | 17.99 in |
| Weld neck — Y | 157 mm | 6.18 in |
| Slip-on / Thr / SW — Y | 87 mm | 3.43 in |
| Lap joint — Y | 130 mm | 5.12 in |
| Bolt circle — W | 628.6 mm | 24.75 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 | 195 mm | 7.68 in |
| Stud length — Ring joint | 210 mm | 8.27 in |
| Weld neck — kg, approx. | 138 kg | 304.2 lb |
| Slip-on — kg, approx. | 109 kg | 240.3 lb |
| Blind — kg, approx. | 177 kg | 390.2 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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18 inch ASME B16.5 Class 300 Flange Dimensions: common questions
What are the 18 inch ASME B16.5 Class 300 Flange Dimensions?
18 inch (DN 450) to ASME B16.5: OD 710 mm; thickness 58.8 mm; raised face 533.4 mm; hub 533 mm; pipe OD 457.0 mm.
Does Teshi Group manufacture 18 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 18 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 18 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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