10 inch class 300 flange: dimensions, bolt circle and drilling (ASME B16.5)
The 10 inch class 300 flange to ASME B16.5 is 17.5 in (444.5 mm) across, with 16 holes of 1.12 in (28.6 mm) on a 15.25 in (387.4 mm) bolt circle, for 1 in bolts; the pipe is 10.75 in (273 mm) outside. The holes straddle the centre lines, the first one 11.25° off, and the chord between neighbouring holes, which is the divider setting for stepping the drilling out, is 2.98 in (75.6 mm).
Dimensions
| Outside diameter | 17.5 in (444.5 mm) |
|---|---|
| Bolt circle (PCD) | 15.25 in (387.4 mm) |
| Number of holes | 16 |
| Hole diameter | 1.12 in (28.6 mm) |
| Bolts | 1 in |
| Pipe outside diameter | 10.75 in (273 mm) |
| Angle between holes | 22.5° |
| First hole from the centre line | 11.25° |
| Chord between neighbouring holes | 2.98 in (75.6 mm) |
Draw this flange: 1:1 template and DXF
Hole coordinates
From the centre of the flange, in mm, with the first hole 11.25° off the horizontal axis and the others counter-clockwise, as the standards lay the drilling out.
| Hole | Angle | x (mm) | y (mm) |
|---|---|---|---|
| 1 | 11.25° | 190.0 | 37.8 |
| 2 | 33.75° | 161.0 | 107.6 |
| 3 | 56.25° | 107.6 | 161.0 |
| 4 | 78.75° | 37.8 | 190.0 |
| 5 | 101.25° | -37.8 | 190.0 |
| 6 | 123.75° | -107.6 | 161.0 |
| 7 | 146.25° | -161.0 | 107.6 |
| 8 | 168.75° | -190.0 | 37.8 |
| 9 | 191.25° | -190.0 | -37.8 |
| 10 | 213.75° | -161.0 | -107.6 |
| 11 | 236.25° | -107.6 | -161.0 |
| 12 | 258.75° | -37.8 | -190.0 |
| 13 | 281.25° | 37.8 | -190.0 |
| 14 | 303.75° | 107.6 | -161.0 |
| 15 | 326.25° | 161.0 | -107.6 |
| 16 | 348.75° | 190.0 | -37.8 |
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.