#400 Flange Bolt Chart
Warning: For reference only
Bolt lengths are sourced from the ASME standard listed at bottom. Exact bolt lengths will vary based on inputs. For more detailed calculations we recommend using the app.
400 Class Flanges
| Nominal Pipe Size | Wrench Size (inches) | Number of Studs | Diameter of Studs (inches) | Length of Stud - RF (inches) | Length of Stud - RTJ (inches) |
|---|---|---|---|---|---|
| 1/2 | 0.875 | 4 | 0.5 | 3 | 3 |
| 3/4 | 1.063 | 4 | 0.625 | 3.5 | 3.5 |
| 1 | 1.063 | 4 | 0.625 | 3.5 | 3.5 |
| 1-1/4 | 1.063 | 4 | 0.625 | 3.75 | 3.75 |
| 1-1/2 | 1.25 | 4 | 0.75 | 4.25 | 4.25 |
| 2 | 1.063 | 8 | 0.625 | 4.25 | 4.25 |
| 2-1/2 | 1.25 | 8 | 0.75 | 4.75 | 4.75 |
| 3 | 1.25 | 8 | 0.75 | 5 | 5 |
| 3-1/2 | 1.438 | 8 | 0.875 | 5.5 | 5.5 |
| 4 | 1.438 | 8 | 0.875 | 5.5 | 5.5 |
| 5 | 1.438 | 8 | 0.875 | 5.75 | 5.75 |
| 6 | 1.438 | 12 | 0.875 | 6 | 6 |
| 8 | 1.625 | 12 | 1 | 6.75 | 6.75 |
| 10 | 1.813 | 16 | 1.125 | 7.5 | 7.5 |
| 12 | 2 | 16 | 1.25 | 8 | 8 |
| 14 | 2 | 20 | 1.25 | 8.25 | 8.25 |
| 16 | 2.188 | 20 | 1.375 | 8.75 | 8.75 |
| 18 | 2.188 | 24 | 1.375 | 9 | 9 |
| 20 | 2.375 | 24 | 1.5 | 9.5 | 9.75 |
| 22 | 2.563 | 24 | 1.625 | 10 | 10.25 |
| 24 | 2.75 | 24 | 1.75 | 10.5 | 11 |
Source: "ASME B16.5-2020 Table 13C Templates for Drilling Class 400 Pipe Flanges"
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