Weld Neck Flange Bore Chart
| Nom pipe Size |
OD | NOMINAL BORE | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sch10 | Sch20 | Sch30 | STD Wall | Sch40 | Sch60 | EXT Hvy | Sch80 | Sch100 | Sch120 | Sch140 | Sch160 | XX Hvy | ||
| 1/2 | 0.840 | 0.674 | ... | ... | 0.622 | 0.622 | ... | 0.546 | 0.546 | ... | ... | ... | 0.464 | 0.252 |
| 3/4 | 1.050 | 0.884 | ... | ... | 0.824 | 0.824 | ... | 0.742 | 0.742 | ... | ... | ... | 0.612 | 0.434 |
| 1 | 1.315 | 1.097 | ... | ... | 1.049 | 1.049 | ... | 0.957 | 0.957 | ... | ... | ... | 0.815 | 0.599 |
| 1 1/4 | 1.660 | 1.442 | ... | ... | 1.380 | 1.380 | ... | 1.278 | 1.278 | ... | ... | ... | 1.160 | 0.896 |
| 1 1/2 | 1.900 | 1.682 | ... | ... | 1.610 | 1.610 | ... | 1.500 | 1.500 | ... | ... | ... | 1.338 | 1.100 |
| 2 | 2.375 | 2.157 | ... | ... | 2.067 | 2.067 | ... | 1.939 | 1.939 | ... | ... | ... | 1.687 | 1.503 |
| 2 1/2 | 2.875 | 2.635 | ... | ... | 2.469 | 2.469 | ... | 2.323 | 2.323 | ... | ... | ... | 2.125 | 1.771 |
| 3 | 3.500 | 3.260 | ... | ... | 3.068 | 3.068 | ... | 2.900 | 2.900 | ... | ... | ... | 2.624 | 2.300 |
| 3 1/2 | 4.000 | 3.760 | ... | ... | 3.548 | 3.548 | ... | 3.364 | 3.364 | ... | ... | ... | ... | 2.728 |
| 4 | 4.500 | 4.260 | ... | ... | 4.026 | 4.026 | ... | 3.826 | 3.826 | ... | 3.624 | ... | 3.438 | 3.152 |
| 5 | 5.563 | 5.295 | ... | ... | 5.047 | 5.047 | ... | 4.813 | 4.813 | ... | 4.563 | ... | 4.313 | 4.063 |
| 6 | 6.625 | 6.357 | ... | ... | 6.065 | 6.065 | ... | 5.761 | 5.761 | ... | 5.501 | ... | 5.187 | 4.897 |
| 8 | 8.625 | 8.329 | 8.125 | 8.071 | 7.981 | 7.981 | 7.813 | 7.625 | 7.625 | 7.437 | 7.187 | 7.001 | 6.813 | 6.875 |
| 10 | 10.750 | 10.420 | 10.250 | 10.136 | 10.020 | 10.020 | 9.750 | 9.750 | 9.562 | 9.312 | 9.062 | 8.750 | 8.500 | 8.750 |
| 12 | 12.750 | 12.390 | 12.250 | 12.090 | 12.000 | 11.938 | 11.626 | 11.750 | 11.374 | 11.062 | 10.750 | 10.500 | 10.126 | 10.750 |
| 14 | 14.000 | 13.500 | 13.376 | 13.250 | 13.250 | 13.124 | 12.812 | 13.000 | 12.500 | 12.124 | 11.812 | 11.500 | 11.188 | ... |
| 16 | 16.000 | 15.500 | 15.376 | 15.250 | 15.250 | 15.000 | 14.688 | 15.000 | 14.312 | 13.938 | 13.562 | 13.124 | 12.812 | ... |
| 18 | 18.000 | 17.500 | 17.376 | 17.124 | 17.250 | 16.876 | 16.500 | 17.000 | 16.124 | 15.688 | 15.250 | 14.876 | 14.438 | ... |
| 20 | 20.000 | 19.500 | 19.250 | 19.000 | 19.250 | 18.812 | 18.376 | 19.000 | 17.938 | 17.438 | 17.000 | 16.500 | 16.062 | ... |
| 22 | 22.000 | 21.500 | ... | ... | 21.250 | ... | ... | 21.000 | ... | ... | ... | ... | ... | ... |
| 24 | 24.000 | 23.500 | 23.250 | 22.876 | 23.250 | 22.624 | 22.062 | 23.000 | 21.562 | 20.938 | 20.376 | 19.876 | 19.312 | ... |
| 26 | 26.000 | ... | ... | ... | 25.250 | ... | ... | 25.000 | ... | ... | ... | ... | ... | ... |
| 30 | 30.000 | 29.376 | 29.000 | 28.750 | 29.250 | ... | ... | 29.000 | ... | ... | ... | ... | ... | ... |
| 36 | 36.000 | 35.376 | 35.000 | 34.750 | 35.250 | 34.500 | ... | 35.000 | ... | ... | ... | ... | ... | ... |
| 40 | 40.000 | ... | ... | ... | 39.250 | ... | ... | 39.000 | ... | ... | ... | ... | ... | ... |
| 42 | 42.000 | ... | ... | ... | 41.250 | ... | ... | 41.000 | ... | ... | ... | ... | ... | ... |
| 48 | 48.000 | ... | ... | ... | 47.250 | ... | ... | 47.000 | ... | ... | ... | ... | ... | ... |
dimensions are in inches
(1) Source: ANSI B36.10
(2) These dimensions are the same for inside pipe diameter. ALWAYS specify bore when ordering
(3) Other type, sizes, and thicknesses of flanges can be provided to meet application
(4) Stocked and manufactured in carbon steel, stainless steel, adn a variety of other metals and alloys
(5) Flange Wall Thickness
