24 inch class 300 flange: dimensions, bolt circle and drilling (ASME B16.5)
The 24 inch class 300 flange to ASME B16.5 is 36 in (914.4 mm) across, with 24 holes of 1.62 in (41.3 mm) on a 32 in (812.8 mm) bolt circle, for 1-1/2 in bolts; the pipe is 24 in (609.6 mm) outside. The holes straddle the centre lines, the first one 7.5° off, and the chord between neighbouring holes, which is the divider setting for stepping the drilling out, is 4.18 in (106.1 mm).
Dimensions
| Outside diameter | 36 in (914.4 mm) |
|---|---|
| Bolt circle (PCD) | 32 in (812.8 mm) |
| Number of holes | 24 |
| Hole diameter | 1.62 in (41.3 mm) |
| Bolts | 1-1/2 in |
| Pipe outside diameter | 24 in (609.6 mm) |
| Angle between holes | 15° |
| First hole from the centre line | 7.5° |
| Chord between neighbouring holes | 4.18 in (106.1 mm) |
Draw this flange: 1:1 template and DXF
Hole coordinates
From the centre of the flange, in mm, with the first hole 7.5° off the horizontal axis and the others counter-clockwise, as the standards lay the drilling out.
| Hole | Angle | x (mm) | y (mm) |
|---|---|---|---|
| 1 | 7.5° | 402.9 | 53.0 |
| 2 | 22.5° | 375.5 | 155.5 |
| 3 | 37.5° | 322.4 | 247.4 |
| 4 | 52.5° | 247.4 | 322.4 |
| 5 | 67.5° | 155.5 | 375.5 |
| 6 | 82.5° | 53.0 | 402.9 |
| 7 | 97.5° | -53.0 | 402.9 |
| 8 | 112.5° | -155.5 | 375.5 |
| 9 | 127.5° | -247.4 | 322.4 |
| 10 | 142.5° | -322.4 | 247.4 |
| 11 | 157.5° | -375.5 | 155.5 |
| 12 | 172.5° | -402.9 | 53.0 |
| 13 | 187.5° | -402.9 | -53.0 |
| 14 | 202.5° | -375.5 | -155.5 |
| 15 | 217.5° | -322.4 | -247.4 |
| 16 | 232.5° | -247.4 | -322.4 |
| 17 | 247.5° | -155.5 | -375.5 |
| 18 | 262.5° | -53.0 | -402.9 |
| 19 | 277.5° | 53.0 | -402.9 |
| 20 | 292.5° | 155.5 | -375.5 |
| 21 | 307.5° | 247.4 | -322.4 |
| 22 | 322.5° | 322.4 | -247.4 |
| 23 | 337.5° | 375.5 | -155.5 |
| 24 | 352.5° | 402.9 | -53.0 |
Questions
- How many bolts does a %{size} %{class} flange have?
- %{holes}, of %{bolt}, through holes of %{hole} on a %{circle} bolt circle.
- What is the bolt circle of a %{size} %{class} flange?
- %{circle}. The holes are %{angle}° apart, and the first one sits %{half}° off the centre line, so that two flanges mate in any symmetric position. The chord between neighbouring holes is %{chord}.
- Can a %{size} %{class} flange be cut from plate?
- As a plate flange, for low pressure: ducts, tanks, water lines. The outline and the drilling above are what the flange calculator draws, with the 1:1 template and the DXF for plasma or laser. A pressure flange to %{standard} is forged, with a hub and a raised face, and its thickness and facing come from the standard.