ASME B16.47 Series B (API 605) — Series B weld neck flange — Class 900 (partial)
ASME B16.47 Series B (API 605) Series B weld neck flange — Class 900 (partial) — 7 sizes. Single-source reference — verify before use.
| NPS | Outside diameter (mm) | Min. thickness (mm) | Length through hub (mm) | Hub diameter (mm) | Raised face dia. (mm) | Bolt circle (mm) | No. of holes | Hole diameter (mm) | Bolt size (in) |
|---|---|---|---|---|---|---|---|---|---|
| 26 | 1022.3 | — | — | — | 762 | 901.7 | 20 | 66.7 | 2-1/2 |
| 28 | — | — | — | — | — | — | — | — | 2-3/4 |
| 30 | — | — | — | — | — | — | — | — | 3 |
| 32 | — | — | — | — | — | — | — | — | 3 |
| 34 | — | — | — | — | — | — | — | — | 3-1/4 |
| 36 | — | — | — | — | — | — | — | — | 3 |
| 48 | — | — | — | — | — | — | 24 | — | 4 |
- PARTIAL TABLE — only NPS 26 has a dimension row confirmed by two sources (inch table + metric table RF 762 / PCD 901.7 mm; Wermac 20 x 2-1/2 in studs).
- NPS 28–36 stud diameters from Boltport only; NPS 36 value (3 in) smaller than NPS 34 (3-1/4 in) as reported — confirm before use. NPS 48 count/stud from Wermac only.
- Per Wermac (citing B16.47): Series B Class 400/600/900 dimensions for NPS 38 and larger are the same as the Series A flanges of the same class — not used to fill this table; see asme-b16.47-series-a-600 / -900.
Sources: wermac.org/flanges/dimensions_welding-neck_blind-flanges_cla · marcelforged.com/flange-dimensions-standards/ansi-asme-b16-4 · pipingpipeline.com/asme-b16-47-sb-flg-cl900.html · boltport.com/standards/asme-b16.47/series-b-flange-studs-and