ASME B16.5 threaded flanges, Class 2500
Every size in the table, in mm, with a 3D model drawn from the same figures. See threaded flanges for materials, standards and the marking.
3D model
1¼" Class 2500 threaded
Key dimensions in mm, ASME B16.5
- O
- Flange diameter
- 185
- Tf
- Flange thickness
- 38.1
- X
- Hub diameter
- 73
- Y
- Length through hub
- 59
- T
- Thread length
- 39
- Q
- Counterbore
- 44.4
- R
- Raised face diameter
- 63.5
- Tr
- Raised face height
- 7
- W
- Bolt circle (PCD)
- 130.2
- d
- Bolt hole diameter
- 28.6
- n
- Number of holes
- 4
Dimensions
Units
Swipe the table sideways for every column. Choose a size to show it in the viewer.
| NPSSize | DNNominal size | OFlange diameter | TfFlange thickness | XHub diameter | YLength through hub | TThread length | QCounterbore | RRaised face diameter | TrRaised face height | WBolt circle (PCD) | dBolt hole diameter | nNumber of holes | Enquiry list |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 15 | 135 | 30.2 | 43 | 47 | 29 | 23.6 | 34.9 | 7 | 88.9 | 22.2 | 4 | ||
| 20 | 140 | 31.8 | 51 | 50 | 32 | 29 | 42.9 | 7 | 95.2 | 22.2 | 4 | ||
| 25 | 160 | 35 | 57 | 55 | 35 | 35.8 | 50.8 | 7 | 108 | 25.4 | 4 | ||
| 32 | 185 | 38.1 | 73 | 59 | 39 | 44.4 | 63.5 | 7 | 130.2 | 28.6 | 4 | In the viewer | |
| 40 | 205 | 44.5 | 79 | 67 | 45 | 50.6 | 73 | 7 | 146 | 31.7 | 4 | ||
| 50 | 235 | 50.9 | 95 | 77 | 51 | 63.5 | 92.1 | 7 | 171.4 | 28.6 | 8 | ||
| 65 | 265 | 57.2 | 114 | 86 | 58 | 76.2 | 104.8 | 7 | 196.8 | 31.7 | 8 |
Dimensions in mm, for reference. Tolerances and full requirements as per the applicable standard. Confirm against your specification before ordering.
Source: Shiv Shakti Machine Tools Flange Catalogue, edition 2026 (draft), page 11. “–” means the catalogue lists no value.
[CONFIRM: table checked and signed off by the owners (unverified)][CONFIRM: whether the flange thickness includes the raised face]