| Dimensions of Class Flanges:- Class 300 & Class 150 |
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This diagram illustrated the arrangement but not necessarily the correct number of bolt holes.
Refer to the column 'Bolting number' in the table for the actual number.
For raised face diameter and different types of flange faces see: Dimensions of Steel Flange Faces |
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| Dimensions of Class 300 Flanges |
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Nominal
Size
DN in |
Mating
Dimensions |
|
Outside
Diameter
D [mm] |
Diameter of
Bolt Circle
K [mm] |
Diameter of
Bolt Hole
L in (mm) |
Bolting
Number |
Bolting
Size
[in] |
Flange
Thickness
C [mm] |
15 |
1/2 |
89 |
60.3 |
5/8 (15.9) |
4 |
1/2 |
11.1 |
| 20 |
3/4 |
98 |
69.8 |
5/8 (15.9) |
4 |
1/2 |
11.1 |
| 25 |
1 |
108 |
79.4 |
5/8 (15.9) |
4 |
1/2 |
11.1 |
| 40 |
1 1/2 |
127 |
98.4 |
5/8 (15.9) |
4 |
1/2 |
14.3 |
| 50 |
2 |
152 |
120.6 |
3/4 (19.0) |
4 |
5/8 |
15.9 |
| 65 |
2 1/2 |
178 |
139.7 |
3/4 (19.0) |
4 |
5/8 |
17.5 |
| 80 |
3 |
190 |
152.4 |
3/4 (19.0) |
4 |
5/8 |
19.0 |
| 100 |
4 |
229 |
190.5 |
3/4 (19.0) |
8 |
5/8 |
23.8 |
| 125 |
5 |
254 |
215.9 |
7/8 (22.2) |
8 |
3/4 |
23.8 |
| 150 |
6 |
279 |
241.3 |
7/8 (22.2) |
8 |
3/4 |
25.4 |
| 200 |
8 |
343 |
298.4 |
7/8 (22.2) |
8 |
3/4 |
28.6 |
| 250 |
10 |
406 |
362.0 |
1 (25.4) |
12 |
7/8 |
30.2 |
| 300 |
12 |
483 |
431.0 |
1 (25.4) |
12 |
7/8 |
31.8 |
| 350 |
14 |
533 |
476.2 |
1 1/8 (28.6) |
12 |
1 |
34.9 |
| 400 |
16 |
597 |
539.8 |
1 1/8 (28.6) |
16 |
1 |
36.5 |
| 450 |
18 |
635 |
577.8 |
1 1/4 (31.8) |
16 |
1 1/8 |
39.7 |
| 500 |
20 |
698 |
635.0 |
1 1/4 (31.8) |
20 |
1 1/8 |
42.9 |
| 600 |
24 |
813 |
749.3 |
1 3/8 (34.9) |
20 |
1 1/4 |
47.6 |
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