L 型 （節(jié)距=9.525mm ）
| 規(guī)格 | 齒數(shù) | 節(jié)徑 d | 外徑 do | 檔邊直徑 df | 檔邊內徑 db | 檔邊厚度 h |
| 12L | 12 | 36.38 | 35.62 | 40 | 27 | 1 |
| 13L | 13 | 39.41 | 38.65 | 44 | 32 | 1 |
| 14L | 14 | 42.45 | 41.68 | 49 | 29 | 1 |
| 15L | 15 | 45.48 | 44.72 | 51 | 36 | 1.2 |
| 16L | 16 | 48.51 | 47.75 | 54 | 39 | 1.2 |
| 17L | 17 | 51.54 | 50.78 | 61 | 45 | 1.2 |
| 18L | 18 | 54.57 | 53.81 | 61 | 45 | 1.2 |
| 19L | 19 | 57.61 | 56.84 | 61 | 45 | 1.2 |
| 20L | 20 | 60.64 | 59.88 | 64 | 48 | 1.2 |
| 21L | 21 | 63.67 | 62.91 | 69 | 54 | 1.2 |
| 22L | 22 | 66.70 | 65.94 | 73 | 55 | 1.2 |
| 23L | 23 | 69.73 | 68.97 | 73 | 55 | 1.2 |
| 24L | 24 | 72.77 | 72.00 | 80 | 60 | 1.2 |
| 25L | 25 | 75.80 | 75.04 | 84 | 64 | 1.2 |
| 26L | 26 | 78.83 | 78.07 | 86 | 70 | 1.2 |
| 27L | 27 | 81.86 | 81.10 | 90 | 70 | 1.2 |
| 28L | 28 | 84.89 | 84.13 | 90 | 70 | 1.2 |
| 30L | 30 | 90.96 | 90.20 | 98 | 78 | 1.2 |
| 32L | 32 | 97.02 | 96.26 | 102 | 83 | 1.2 |
| 34L | 34 | 103.08 | 102.32 | 109 | 90 | 1.2 |
| 36L | 36 | 109.15 | 108.39 | 115 | 95 | 1.2 |
| 38L | 38 | 115.21 | 114.45 | 123 | 103 | 1.2 |
| 40L | 40 | 121.28 | 120.51 | 131 | 111 | 1.5 |
| 42L | 42 | 127.34 | 126.58 | 138 | 118 | 1.5 |
| 44L | 44 | 133.40 | 132.64 | 139 | 110 | 1.5 |
| 46L | 46 | 139.47 | 138.71 | 153 | 133 | 1.5 |
| 48L | 48 | 145.53 | 144.77 | 153 | 133 | 1.5 |
