ASME B16.47 Series A — Series A weld neck flange — Class 600 (NPS 26–48)
ASME B16.47 Series A Series A weld neck flange — Class 600 (NPS 26–48) — 12 sizes.
| 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 | 1016 | 107.9 | 222.2 | 747.8 | 749.3 | 914.4 | 28 | 50.8 | 1-7/8 |
| 28 | 1073.1 | 111.3 | 234.9 | 803.1 | 800.1 | 965.2 | 28 | 53.8 | 2 |
| 30 | 1130.3 | 114.3 | 247.6 | 862.1 | 857.2 | 1022.3 | 28 | 53.8 | 2 |
| 32 | 1193.8 | 117.3 | 260.3 | 917.4 | 914.4 | 1079.5 | 28 | 60.5 | 2-1/4 |
| 34 | 1244.6 | 120.6 | 269.7 | 973.1 | 965.2 | 1130.3 | 28 | 60.5 | 2-1/4 |
| 36 | 1314.4 | 124 | 282.4 | 1031.7 | 1022.3 | 1193.8 | 28 | 66.5 | 2-1/2 |
| 38 | 1270 | 152.4 | 254 | 1022.3 | 1054.1 | 1162 | 28 | 60.5 | 2-1/4 |
| 40 | 1320.8 | 158.8 | 263.7 | 1073.1 | 1111.2 | 1212.8 | 32 | 60.5 | 2-1/4 |
| 42 | 1403.3 | 168.1 | 279.4 | 1127.3 | 1168.4 | 1282.7 | 28 | 66.5 | 2-1/2 |
| 44 | 1454.1 | 173 | 289.1 | 1181.1 | 1225.5 | 1333.5 | 32 | 66.5 | 2-1/2 |
| 46 | 1511.3 | 179.3 | 300 | 1234.9 | 1276.3 | 1390.6 | 32 | 66.5 | 2-1/2 |
| 48 | 1593.8 | 189 | 316 | 1289 | 1333.5 | 1460.5 | 32 | 73.2 | 2-3/4 |
- Source tables are in inches; converted to mm at 25.4 mm/in and rounded to 0.1 mm.
- Min. thickness is the weld-neck flange thickness (excludes raised face). Raised face height for Class 600 is 6.4 mm (0.25 in) per B16.47 convention, not re-verified here.
- Rows 26, 28, 32–42, 48: Ferrobend and Project Materials agree. Rows 30, 44, 46: flange dimensions from Ferrobend only (single-source).
- NPS 32 hub diameter: Ferrobend 36.12 in, Project Materials 36.15 in; Ferrobend value kept. NPS 32/42 thickness 4.62/6.62 (Ferrobend) vs 4.63/6.63 (Project Materials).
- Bolt sizes: Wermac B16.47A stud table (NPS 26–42) and a second listing for 44–48; consistent with hole dia = bolt + 1/8 in. NPS 44/46 bolt size single-source.
- Red Earth Steels and htpipe metric tables contain inconsistent rows and were not used.
Sources: ferrobend.com/dimensions/ansi-asme/flange/b16.47-series-a-cl · blog.projectmaterials.com/flanges/flange-dimensions/asme-b16 · wermac.org/bolts/dims_studs_b16-47a_150_900.html · wermac.org/flanges/dimensions_welding-neck_blind-flanges_cla · marcelforged.com/flange-dimensions-standards/ansi-asme-b16-4