ANSI B16. 47 series B flanges are much thicker, heavier, and stronger. They are of the same size and render a similar pressure rating. They can withstand more external loading than any other series B flange. It uses smaller fasteners, so you might have to use more bolts and nuts while installing them than the series A flanges, which have a smaller bolt circle diameter.
The smaller the bold circle diameter, the less flange movement after installation. Both series A and B are defined into weld neck flanges and blind flanges in raised face type. Only series A defines the ring type joint, flanges from Class 300 to class 900. From a commercial point of view ANSI B16. 47 flanges are more experience, but they are robust and serve as an efficient solution for more pressure handling.
| Nom. Pipe Size | O | T | Tj | R | X | # Dia of Holes | Bolt Circle Dia | B | B2 | B3 | H | L | L2 | L3 | r | D | Thr |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ½ | 3.50 | 0.38 | 0.44 | 1.38 | 1.19 | 4-Ø.62 | 2.38 | 0.88 | 0.62 | 0.94 | 0.56 | 1.81 | 0.62 | 0.12 | 0.38 | 0.62 | |
| ¾ | 3.88 | 0.44 | 0.50 | 1.69 | 1.50 | 4-Ø.62 | 2.75 | 1.09 | 0.82 | 1.11 | 1.05 | 2.06 | 0.62 | 0.12 | 0.44 | 0.62 | |
| 1 | 4.25 | 0.50 | 0.56 | 2.00 | 1.94 | 4-Ø.62 | 3.12 | 1.36 | 1.05 | 1.38 | 1.32 | 2.12 | 0.69 | 0.12 | 0.50 | 0.69 | |
| 1½ | 4.62 | 0.56 | 0.62 | 2.38 | 2.06 | 4-Ø.62 | 3.88 | 1.70 | 1.38 | 1.62 | 1.62 | 2.19 | 0.81 | 0.19 | 0.56 | 0.81 | |
| 1¼ | 5.00 | 0.62 | 0.69 | 2.88 | 2.56 | 4-Ø.62 | 4.25 | 1.95 | 1.61 | 1.91 | 1.91 | 2.38 | 0.88 | 0.25 | 0.62 | 0.88 | |
| 2 | 6.00 | 0.69 | 0.75 | 3.62 | 3.06 | 4-Ø.75 | 4.75 | 2.44 | 2.07 | 2.46 | 2.38 | 2.44 | 1.00 | 0.31 | 0.69 | 1.00 | |
| 2½ | 7.00 | 0.81 | 0.88 | 5.00 | 4.25 | 4-Ø.75 | 5.50 | 2.94 | 2.47 | 2.97 | 2.88 | 2.69 | 1.12 | 0.31 | 0.75 | 1.12 | |
| 3 | 7.50 | 0.88 | 0.94 | 5.50 | 4.25 | 4-Ø.75 | 6.00 | 3.57 | 3.07 | 3.60 | 3.12 | 2.69 | 1.19 | 0.38 | 0.81 | 1.19 | |
| 3½ | 8.50 | 0.88 | 0.94 | 6.00 | 4.75 | 4-Ø.75 | 6.50 | 3.87 | 3.35 | 4.10 | 3.69 | 2.75 | 1.25 | 0.38 | 0.88 | 1.25 | |
| 4 | 9.00 | 0.88 | 0.94 | 7.31 | 6.44 | 8-Ø.75 | 7.00 | 4.57 | 4.08 | 4.60 | 4.13 | 2.94 | 1.31 | 0.44 | 0.94 | 1.31 | |
| 5 | 10.00 | 0.88 | 0.94 | 7.56 | 6.88 | 8-Ø.88 | 8.50 | 5.66 | 5.05 | 5.99 | 5.25 | 3.18 | 1.44 | 0.44 | 0.94 | 1.44 | |
| 6 | 11.00 | 0.94 | 1.00 | 8.25 | 7.56 | 8-Ø.88 | 9.50 | 6.25 | 5.62 | 6.72 | 5.88 | 3.44 | 1.56 | 0.50 | 1.06 | 1.56 | |
| 8 | 13.50 | 1.06 | 1.12 | 10.62 | 9.06 | 8-Ø.88 | 11.75 | 8.72 | 7.98 | 9.25 | 8.25 | 3.94 | 1.75 | 0.50 | 1.25 | 1.75 | |
| 10 | 16.00 | 1.12 | 1.19 | 12.75 | 10.62 | 12-Ø.88 | 14.25 | 10.88 | 10.02 | 10.75 | 10.25 | 3.94 | 1.94 | 0.50 | 1.31 | 1.94 | |
| 12 | 19.00 | 1.19 | 1.25 | 15.00 | 13.38 | 12-Ø.1 | 17.00 | 12.88 | 12.03 | 12.88 | 12.00 | 4.44 | 2.19 | 0.50 | 1.56 | 2.19 | |
| 14 | 21.00 | 1.31 | 1.38 | 16.25 | 15.75 | 12-Ø.1 | 18.75 | 14.13 | 13.15 | 14.25 | 14.00 | 4.94 | 3.12 | 0.50 | 1.63 | 2.25 | |
| 16 | 23.50 | 1.38 | 1.44 | 18.00 | 16.88 | 16-Ø.1 | 21.25 | 16.16 | 15.28 | 16.44 | 16.00 | 4.94 | 3.44 | 0.50 | 1.75 | 2.50 | |
| 18 | 25.00 | 1.50 | 1.56 | 19.25 | 18.75 | 16-Ø.1 | 22.75 | 18.18 | 17.28 | 18.40 | 18.00 | 5.44 | 3.81 | 0.50 | 1.94 | 2.69 | |
| 20 | 27.50 | 1.62 | 1.69 | 21.00 | 20.25 | 20-Ø.1 | 25.00 | 20.20 | 19.25 | 20.56 | 20.00 | 5.62 | 4.06 | 0.50 | 2.13 | 2.88 | |
| 22 | 29.50 | 1.75 | 1.81 | 23.25 | 22.38 | 20-Ø.1 | 27.25 | 22.25 | 21.25 | 22.63 | 22.00 | 5.82 | 4.25 | 0.50 | 2.38 | 3.13 | |
| 24 | 32.00 | 1.81 | 1.88 | 25.25 | 26.12 | 20-Ø.1 | 29.50 | 24.25 | 23.25 | 24.25 | 24.00 | 5.94 | 4.38 | 0.50 | 2.50 | 3.25 |