Carbon and Stainless Steel Welding Neck Flange Bores
Welding neck flange bores according ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings:
For full table - rotate the screen!
| 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 | - | - |
- 1 inch = 25.4 mm
For full table - rotate the screen!
| 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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