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Carbon and Stainless Steel Flanges
- ASME/ANSI Class 400
ASME/ANSI B16.5-1996 Pipe Flanges
and Flanged Fittings - Class 400 Flanges - outside and inside
diameters, bolt circles, numbers and diameters of bolts for
Weld neck, Threaded, Slip-on, Lap joint, Socket weld and Blind
flanges.
Carbon and stainless steel qualities according ASME
B16.5 Table 1A.
Pipe
Size
(inches) |
Outside Diameter
(inches) |
Inside Diameter
(inches) |
Number of Bolt Holes |
Bolt
Hole Diameter
(inches) 1) |
Bolt
Circle
(inches) |
| 1/2 |
3-3/4 |
0.88 |
4 |
5/8 |
2-5/8 |
| 3/4 |
4-5/8 |
1.09 |
4 |
3/4 |
3-1/4 |
| 1 |
4-7/8 |
1.36 |
4 |
3/4 |
3-1/2 |
| 1-1/4 |
5-1/4 |
1.70 |
4 |
3/4 |
3-7/8 |
| 1-1/2 |
6-1/8 |
1.95 |
4 |
7/8 |
4-1/2 |
| 2 |
6-1/2 |
2.44 |
8 |
3/4 |
5 |
| 2-1/2 |
7-1/2 |
2.94 |
8 |
7/8 |
5-7/8 |
| 3 |
8-1/4 |
3.57 |
8 |
7/8 |
6-5/8 |
| 3-1/2 |
9 |
4.07 |
8 |
1 |
7-1/4 |
| 4 |
10 |
4.57 |
8 |
1 |
8-7/8 |
| 5 |
11 |
5.66 |
8 |
1 |
9-1/4 |
| 6 |
12-1/2 |
6.72 |
12 |
1 |
10-5/8 |
| 8 |
15 |
8.72 |
12 |
1-1/8 |
13 |
| 10 |
17-1/2 |
10.88 |
16 |
1-1/4 |
15-1/4 |
| 12 |
20-1/2 |
12.88 |
16 |
1-3/8 |
17-3/4 |
| 14 |
23 |
14.14 |
20 |
1-3/8 |
20-1/4 |
| 16 |
25-1/2 |
16.16 |
20 |
1-1/2 |
22-1/2 |
| 18 |
28 |
18.18 |
24 |
1-1/2 |
24-3/4 |
| 20 |
30-1/2 |
20.20 |
24 |
1-5/8 |
27 |
| 24 |
36 |
24.25 |
24 |
1-7/8 |
32 |
1) Recommended bolts are 1/8 smaller
than the nominal bolt hole diameters shown.
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