A figure-8 blank (also called a Spectacle Blind Flange) is a pressure-retaining plate with one solid end and one open end connected with a web or tie bar.
| NPS | Inside Diameter, B | Outside Diameter, O | Centerline Dimension, A | Thick-ness, t | Web Width, W | Approximate Weight kgs | |
| 1/2 | 16 | 60 | 80 | 6.4 | 38 | 7 | 0.97 |
| 3/4 | 21 | 67 | 90 | 6.4 | 41 | 7 | 1.21 |
| 1 | 27 | 76 | 100 | 6.4 | 57 | 7 | 1.56 |
| 1 1/4 | 37 | 86 | 110 | 9.7 | 57 | 7 | 2.17 |
| 1 1/2 | 43 | 95 | 125 | 9.7 | 67 | 7 | 2.74 |
| 2 | 55 | 140 | 165 | 12.7 | 57 | 7 | 6.18 |
| 2 1/2 | 67 | 162 | 190 | 12.7 | 67 | 7 | 8.23 |
| 3 | 83 | 165 | 190 | 15.7 | 67 | 7 | 8.97 |
| 4 | 108 | 203 | 235 | 19.1 | 76 | 7 | 14.93 |
| 5 | 135 | 244 | 280 | 22.4 | 86 | 7 | 23.34 |
| 6 | 162 | 286 | 320 | 25.4 | 86 | 7 | 34.00 |
| 8 | 212 | 356 | 395 | 35.1 | 95 | 7 | 64.06 |
| 10 | 265 | 432 | 470 | 41.1 | 105 | 7 | 103.95 |
| 12 | 315 | 495 | 535 | 47.8 | 105 | 7 | 150.06 |
| 14 | 346 | 518 | 560 | 53.8 | 114 | 7 | 175.65 |
| 16 | 397 | 572 | 615 | 60.5 | 124 | 7 | 229.76 |
| 18 | 448 | 635 | 685 | 66.5 | 133 | 7 | 302.92 |
| 20 | 497 | 696 | 750 | 73.2 | 133 | 7 | 390.75 |
| 24 | 597 | 835 | 900 | 88.9 | 152 | 7 | 663.01 |
