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Contact Supplier| NOMINAL SIZE (inches) | SPECIFIED DIMENSIONS & TOLERANCE (a) | OBSERVED DIMENSIONS (a) | SPECIFIED WALL THICKNESS & TOLERANCE | OBSERVED WALL THICKNESS |
| 1/4 | 27 ± 1.5 | 28.5 | 2.5 -0.5 | 3.0 |
| 3/8 | 30 ± 1.5 | 31.0 | 2.5 -0.5 | 3.0 |
| 1/2 | 36 ± 2.0 | 36.5 | 2.5 -0.5 | 3.8 |
| 3/4 | 39 ± 2.0 | 39.5 | 3.0 -0.7 | 3.9 |
| 1 | 45 ± 2.0 | 46.0 | 3.0 -0.7 | 3.9 |
| 1¼ | 50 ± 2.0 | 50.5 | 3.5 -0.7 | 4.2 |
| 1½ | 55 ± 2.5 | 56.0 | 3.5 -0.7 | 4.0 |
| 2 | 58 ± 2.5 | 59.0 | 4.0 -0.7 | 5.0 |
| 2½ | 71 ± 2.5 | 72.4 | 4.5 -1.0 | 4.5 |
| 3 | 78 ± 3.0 | 80.0 | 5.0 -1.0 | 6.5 |
| 4 | 94 ± 3.0 | 95.5 | 6.0 -1.0 | 6.0 |
| 5 | 109 ± 3.5 | 110.5 | 6.5 -1.0 | 8.0 |
| 6 | 120 ± 3.5 | 120.0 | 7.5 -1.0 | 8.0 |
| 8 | - - | 128.0 | - - | 10.0 |