AT20 规格 齿距:20mm
| 规格 | 节线长(mm) | 宽度 |
| AT20 1000 | 1000.0 | 50 |
| AT20 1100 | 1100.0 | 55 |
| AT20 1200 | 1200.0 | 60 |
| AT20 1260 | 1260.0 | 63 |
| AT20 1500 | 1500.0 | 75 |
| AT20 1600 | 1600.0 | 80 |
| AT20 1700 | 1700.0 | 85 |
| AT20 1760 | 1760.0 | 88 |
| AT20 1800 | 1800.0 | 93 |
| AT20 1900 | 1900.0 | 95 |
| AT20 1960 | 1960.0 | 98 |
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