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Cast Iron Flanges - ASME/ANSI Class
250
ASME/ANSI B16.1 - 1998 - Cast Iron
Pipe Flanges and Flanged Fittings - Class 250 Flanges - outside
and inside diameters, bolt circles, numbers and diameters of bolts
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Cast Iron Flanges - ASME/ANSI
250 lb
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Pipe
Size
(inches) |
Outside Diameter
(inches) |
Number of Bolt Holes |
Bolt
Hole Diameter
(inches) |
Bolt
Circle
(inches) |
| 1 |
4-7/8 |
4 |
3/4 |
3-1/2 |
| 1-1/4 |
5-1/4 |
4 |
3/4 |
3-7/8 |
| 1-1/2 |
6-1/8 |
4 |
7/8 |
4-1/2 |
| 2 |
6-1/2 |
8 |
3/4 |
5 |
| 2-1/2 |
7-1/2 |
8 |
7/8 |
5-7/8 |
| 3 |
8-1/4 |
8 |
7/8 |
6-5/8 |
| 3-1/2 |
9 |
8 |
7/8 |
7-1/4 |
| 4 |
10 |
8 |
7/8 |
7-7/8 |
| 5 |
11 |
8 |
7/8 |
9-1/4 |
| 6 |
12-1/2 |
12 |
7/8 |
10-5/8 |
| 8 |
15 |
12 |
1 |
13 |
| 10 |
17-1/2 |
16 |
1-1/8 |
15-1/4 |
| 12 |
20-1/2 |
16 |
1-1/4 |
17-3/4 |
| 14 |
23 |
20 |
1-1/4 |
20-1/4 |
| 16 |
25-1/2 |
20 |
1-3/8 |
22-1/2 |
| 18 |
28 |
24 |
1-3/8 |
24-3/4 |
| 20 |
30-1/2 |
24 |
1-3/8 |
27 |
| 24 |
36 |
24 |
1-5/8 |
32 |
| 30 |
43 |
28 |
2 |
39-1/4 |
| 36 |
50 |
32 |
2-1/4 |
46 |
| 42 |
57 |
36 |
2-1/4 |
52-3/4 |
| 48 |
65 |
40 |
2-1/4 |
60-3/4 |
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