Schematic — drawn from the table, not to scale for inspection.
| Symbol | Item | Value |
|---|---|---|
| D | Outside diameter | 641.4mm |
| C | Flange thickness / blind thickness | 85.9mm |
| D2 | Raised face diameter | 412.8mm |
| f | Raised face height | 6.4mm |
| K | Bolt circle diameter | 558.8mm |
| n | Number of bolt holes | 20pcs |
| d | Bolt hole diameter | 41.3mm |
| A | Hub diameter | 450.9mm |
| H | Hub length / overall length | 212.9mm |
| B | Welding-end diameter | 355.6mm |
| — | Approximate weight | 181kg |
Source: Table 2-1.1 (printed p. 25) — pressure–temperature ratings for Group 1.1 materials, SI units; Group 1.1.
Base material: ASTM A105 (North America, Middle East, South-East Asia)
Rating: ASME classes are not fixed pressures. For ASTM A105 (material group 1.1) the ASME B16.5-2025 ambient rating is 285 psi (19.6 bar) at Class 150, 740 psi (51.0 bar) at Class 300, 985 psi (68.0 bar) at Class 400, 1,480 psi (102.0 bar) at Class 600, 2,2…
Tolerances / marking: Tolerances, facing finish, material and marking requirements: ASME B16.5-2025 Sections 6 and 7.