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单位：英寸（inch）
| (inch) | P | c max | b1 min | b1 max | ds max | ds min |
|---|---|---|---|---|---|---|
| 1/4 | 28 | 0.071 | 0.35 | 0.4 | 0.243 | 0.223 |
| 5/16 | 24 | 0.083 | 0.44 | 0.498 | 0.304 | 0.281 |
| 3/8 | 24 | 0.083 | 0.532 | 0.594 | 0.367 | 0.343 |
| 7/16 | 20 | 0.1 | 0.62 | 0.692 | 0.428 | 0.4 |
| 1/2 | 20 | 0.1 | 0.708 | 0.792 | 0.491 | 0.462 |
| 9/16 | 18 | 0.111 | 0.802 | 0.896 | 0.552 | 0.521 |
| 5/8 | 18 | 0.111 | 0.892 | 0.983 | 0.615 | 0.583 |
| 3/4 | 16 | 0.125 | 1.075 | 1.175 | 0.739 | 0.703 |
| 7/8 | 14 | 0.143 | 1.258 | 1.368 | 0.863 | 0.822 |
| 1 | 12 | 0.167 | 1.438 | 1.562 | 0.987 | 0.938 |
| 1-1/8 | 12 | 0.167 | 1.625 | 1.75 | 1.112 | 1.063 |
| 1-1/4 | 12 | 0.167 | 1.813 | 1.938 | 1.237 | 1.188 |
| 1-3/8 | 12 | 0.167 | 2 | 2.125 | 1.362 | 1.313 |
| 1-1/2 | 12 | 0.167 | 2.188 | 2.313 | 1.487 | 1.438 |
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