Carbon and Stainless Steel Welding Neck Flange Bores
Flange bores of welding neck flanges according ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings
Welding neck flange bores according ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings - can be found in the table below:
| Welding Neck Flange Bores |
Nominal Pipe Size
(inches) |
Outside Diameter
(inches) |
Inside Diameter (inches) |
| Light Wall 1) |
Schedule 20 |
Schedule 30 |
Standard Wall |
Schedule 40 |
Schedule 60 |
| 1/2 |
0.840 |
0.674 |
- |
- |
0.622 |
0.622 |
- |
| 3/4 |
1.050 |
0.884 |
- |
- |
0.824 |
0.824 |
- |
| 1 |
1.315 |
1.097 |
- |
- |
1.049 |
1.049 |
- |
| 1 1/4 |
1.660 |
1.442 |
- |
- |
1.380 |
1.380 |
- |
| 1 1/2 |
1.900 |
1.682 |
- |
- |
1.610 |
1.610 |
- |
| 2 |
2.375 |
2.157 |
- |
- |
2.067 |
2.067 |
- |
| 2 1/2 |
2.875 |
2.635 |
- |
- |
2.469 |
2.469 |
- |
| 3 |
3.500 |
3.260 |
- |
- |
3.068 |
3.068 |
- |
| 3 1/2 |
4.000 |
3.760 |
- |
- |
3.548 |
3.548 |
- |
| 4 |
4.500 |
4.260 |
- |
- |
4.026 |
4.026 |
- |
| 5 |
5.563 |
5.295 |
- |
- |
5.047 |
5.047 |
- |
| 6 |
6.625 |
6.357 |
- |
- |
6.065 |
6.065 |
- |
| 8 |
8.625 |
8.329 |
8.125 |
8.071 |
7.981 |
7.981 |
7.813 |
| 10 |
10.750 |
10.420 |
10.250 |
10.136 |
10.020 |
10.020 |
9.750 |
| 12 |
12.750 |
12.390 |
12.250 |
12.090 |
12.000 |
11.938 |
11.626 |
| 14 |
14.000 |
13.500 |
13.376 |
13.250 |
13.250 |
13.124 |
12.812 |
| 16 |
16.000 |
15.500 |
15.376 |
15.250 |
15.250 |
15.000 |
14.688 |
| 18 |
18.000 |
17.500 |
17.376 |
17.124 |
17.250 |
16.876 |
16.500 |
| 20 |
20.000 |
19.500 |
19.250 |
19.000 |
19.250 |
18.812 |
18.376 |
| 24 |
24.000 |
23.500 |
23.250 |
22.876 |
23.250 |
22.624 |
22.062 |
| 30 |
30.000 |
29.376 |
29.000 |
28.750 |
29.250 |
- |
- |
| 36 |
36.000 |
35.376 |
35.000 |
34.750 |
35.250 |
34.500 |
- |
| 42 |
42.000 |
- |
- |
- |
41.250 |
- |
- |
| 48 |
48.000 |
- |
- |
- |
47.250 |
- |
- |
| Welding Neck Flange Bores |
Nominal Pipe Size
(inches) |
Outside Diameter
(inches) |
Inside Diameter (inches) |
| Extra Strong |
Schedule 80 |
Schedule 100 |
Schedule 120 |
Schedule 140 |
Schedule 160 |
Double Extra Strong |
| 1/2 |
0.840 |
0.546 |
0.546 |
- |
- |
- |
0.464 |
0.252 |
| 3/4 |
1.050 |
0.742 |
0.742 |
- |
- |
- |
0.612 |
0.434 |
| 1 |
1.315 |
0.957 |
0.957 |
- |
- |
- |
0.815 |
0.599 |
| 1 1/4 |
1.660 |
1.278 |
1.278 |
- |
- |
- |
1.160 |
0.896 |
| 1 1/2 |
1.900 |
1.500 |
1.500 |
- |
- |
- |
1.338 |
1.100 |
| 2 |
2.375 |
1.939 |
1.939 |
- |
- |
- |
1.687 |
1.503 |
| 2 1/2 |
2.875 |
2.323 |
2.323 |
- |
- |
- |
2.125 |
1.771 |
| 3 |
3.500 |
2.900 |
2.900 |
- |
- |
- |
2.624 |
2.300 |
| 3 1/2 |
4.000 |
3.364 |
3.364 |
- |
- |
- |
- |
2.728 |
| 4 |
4.500 |
3.826 |
3.826 |
- |
3.624 |
- |
3.438 |
3.152 |
| 5 |
5.563 |
4.813 |
4.813 |
- |
4.563 |
- |
4.313 |
4.063 |
| 6 |
6.625 |
5.761 |
5.761 |
- |
5.501 |
- |
5.187 |
4.897 |
| 8 |
8.625 |
7.625 |
7.625 |
7.437 |
7.187 |
7.001 |
6.813 |
6.875 |
| 10 |
10.750 |
9.750 |
9.562 |
9.312 |
9.062 |
8.750 |
8.500 |
8.750 |
| 12 |
12.750 |
11.750 |
11.374 |
11.062 |
10.750 |
10.500 |
10.126 |
10.750 |
| 14 |
14.000 |
13.000 |
12.500 |
12.124 |
11.814 |
11.500 |
11.188 |
- |
| 16 |
16.000 |
15.000 |
14.312 |
13.938 |
13.564 |
13.124 |
12.812 |
- |
| 18 |
18.000 |
17.000 |
16.124 |
15.688 |
15.250 |
14.876 |
14.438 |
- |
| 20 |
20.000 |
19.000 |
17.938 |
17.438 |
17.000 |
16.500 |
16.062 |
- |
| 24 |
24.000 |
23.000 |
21.562 |
20.938 |
20.376 |
19.876 |
19.312 |
- |
| 30 |
30.000 |
29.000 |
- |
- |
- |
- |
- |
- |
| 36 |
36.000 |
35.000 |
- |
- |
- |
- |
- |
- |
| 42 |
42.000 |
41.000 |
- |
- |
- |
- |
- |
- |
| 48 |
48.000 |
47.000 |
- |
- |
- |
- |
- |
- |
1) Stainless steel Schedule 10S diameters are equal to Light Wall in sizes up to 12" and to Schedule 10 above.
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