T20 规格 齿距:20.0mm
| 规格 | 节线长(mm) | 宽度 |
| T20 1260 | 1260.0 | 63 |
| T20 1460 | 1460.0 | 73 |
| T20 1780 | 1780.0 | 89 |
| T20 1880 | 1880.0 | 94 |
| T20 2360 | 2360.0 | 118 |
| T20 2600 | 2600.0 | 130 |
| T20 3100 | 3100.0 | 155 |
| T20 3620 | 3620.0 | 181 |
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