公制键槽详解：尺寸、公差与关键应用
平键公制键槽尺寸与公差
键与键槽固定轮毂与轴，防止传动轴与连接部件相对移动。详见《键与键槽》了解工作原理与类型。
例如：齿轮、带轮、链轮通过键固定在传动轴上。
| 轴 | 键 | 键槽 | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 公称 直径 |
尺寸 | 宽度 (b) | 深度 (t) | 圆角 (r) |
|||||||||||||||
| 公称 | 自由 | 正常 | 紧/过盈 | 轴 (t1) | 轮毂 (t2) | ||||||||||||||
| d | 轴 (H9) | 轮毂 (D10) | 轴 (N9) | 轮毂 (Js9) | 轴/轮毂 (P9) | ||||||||||||||
| 超过 | 至 | b × h | 最小 | 最大 | 最小 | 最大 | 最小 | 最大 | 最小 | 最大 | 最小 | 最大 | 最小 | 最大 | 最小 | 最大 | 最小 | 最大 | |
| 6 | 8 | 2×2 | 2 | 0 | +0.025 | +0.02 | +0.06 | -0.029 | -0.004 | -0.012 | +0.012 | -0.031 | -0.006 | 1.2 | 1.3 | 1.0 | 1.1 | 0.08 | 0.16 |
| 8 | 10 | 3×3 | 3 | 0 | +0.025 | +0.02 | +0.06 | -0.029 | -0.004 | -0.012 | +0.012 | -0.031 | -0.006 | 1.8 | 1.9 | 1.4 | 1.5 | 0.08 | 0.16 |
| 10 | 12 | 4×4 | 4 | 0 | +0.03 | +0.030 | +0.078 | -0.030 | 0 | -0.015 | +0.015 | -0.042 | -0.012 | 2.5 | 2.6 | 1.8 | 1.9 | 0.08 | 0.16 |
| 12 | 17 | 5×5 | 5 | 0 | +0.03 | +0.030 | +0.078 | -0.030 | 0 | -0.015 | +0.015 | -0.042 | -0.012 | 3.0 | 3.1 | 2.3 | 2.4 | 0.16 | 0.25 |
| 17 | 22 | 6×6 | 6 | 0 | +0.03 | +0.030 | +0.078 | -0.030 | 0 | -0.015 | +0.015 | -0.042 | -0.012 | 3.5 | 3.6 | 2.8 | 2.9 | 0.16 | 0.25 |
| 22 | 30 | 8×7 | 8 | 0 | +0.036 | +0.040 | +0.098 | -0.036 | 0 | -0.018 | +0.018 | -0.051 | -0.015 | 4.0 | 4.2 | 3.3 | 3.5 | 0.16 | 0.25 |
| 30 | 38 | 10×8 | 10 | 0 | +0.036 | +0.040 | +0.098 | -0.036 | 0 | -0.018 | +0.018 | -0.051 | -0.015 | 5.0 | 5.2 | 3.3 | 3.5 | 0.25 | 0.40 |
| 38 | 44 | 12×8 | 12 | 0 | +0.043 | +0.050 | +0.12 | -0.043 | 0 | -0.021 | +0.021 | -0.061 | -0.018 | 5.0 | 5.2 | 3.3 | 3.5 | 0.25 | 0.40 |
| 44 | 50 | 14×9 | 14 | 0 | +0.043 | +0.050 | +0.12 | -0.043 | 0 | -0.021 | +0.021 | -0.061 | -0.018 | 5.5 | 5.7 | 3.8 | 4.0 | 0.25 | 0.40 |
| 50 | 58 | 16×10 | 16 | 0 | +0.043 | +0.050 | +0.12 | -0.043 | 0 | -0.021 | +0.021 | -0.061 | -0.018 | 6.0 | 6.2 | 4.3 | 4.5 | 0.25 | 0.40 |
| 58 | 65 | 18×11 | 18 | 0 | +0.043 | +0.050 | +0.12 | -0.043 | 0 | -0.021 | +0.021 | -0.061 | -0.018 | 7.0 | 7.2 | 4.4 | 4.6 | 0.25 | 0.40 |
| 65 | 75 | 20×12 | 20 | 0 | +0.052 | +0.065 | +0.149 | -0.052 | 0 | -0.026 | +0.026 | -0.074 | -0.022 | 7.5 | 7.7 | 4.9 | 5.1 | 0.40 | 0.60 |
| 75 | 85 | 22×14 | 22 | 0 | +0.052 | +0.065 | +0.149 | -0.052 | 0 | -0.026 | +0.026 | -0.074 | -0.022 | 9.0 | 9.2 | 5.4 | 5.6 | 0.40 | 0.60 |
| 85 | 95 | 25×14 | 25 | 0 | +0.052 | +0.065 | +0.149 | -0.052 | 0 | -0.026 | +0.026 | -0.074 | -0.022 | 9.0 | 9.2 | 5.4 | 5.6 | 0.40 | 0.60 |
| 95 | 110 | 28×16 | 28 | 0 | +0.052 | +0.065 | +0.149 | -0.052 | 0 | -0.026 | +0.026 | -0.074 | -0.022 | 10.0 | 10.2 | 6.4 | 6.6 | 0.40 | 0.60 |
| 110 | 130 | 32×18 | 32 | 0 | +0.062 | +0.080 | +0.18 | -0.062 | 0 | -0.031 | +0.031 | -0.088 | -0.026 | 11.0 | 11.2 | 7.4 | 7.6 | 0.4 | 0.6 |
| 130 | 150 | 36×20 | 36 | 0 | +0.062 | +0.080 | +0.18 | -0.062 | 0 | -0.031 | +0.031 | -0.088 | -0.026 | 12.0 | 12.3 | 8.4 | 8.7 | 0.7 | 1.0 |
| 150 | 170 | 40×22 | 40 | 0 | +0.062 | +0.080 | +0.18 | -0.062 | 0 | -0.031 | +0.031 | -0.088 | -0.026 | 13.0 | 13.3 | 9.4 | 9.7 | 0.7 | 1.0 |
| 170 | 200 | 45×25 | 45 | 0 | +0.062 | +0.080 | +0.18 | -0.062 | 0 | -0.031 | +0.031 | -0.088 | -0.026 | 15.0 | 15.3 | 10.4 | 10.7 | 0.7 | 1.0 |
| 200 | 230 | 50×28 | 50 | 0 | +0.062 | +0.080 | +0.18 | -0.062 | 0 | -0.031 | +0.031 | -0.088 | -0.026 | 17.0 | 17.3 | 11.4 | 11.7 | 0.7 | 1.0 |
| 230 | 260 | 56×32 | 56 | 0 | +0.074 | 0.100 | +0.220 | -0.074 | 0 | -0.037 | +0.037 | -0.106 | -0.032 | 20.0 | 20.3 | 12.4 | 12.7 | 1.2 | 1.6 |
| 260 | 290 | 63×32 | 63 | 0 | +0.074 | 0.100 | +0.220 | -0.074 | 0 | -0.037 | +0.037 | -0.106 | -0.032 | 20.0 | 20.3 | 12.4 | 12.7 | 1.2 | 1.6 |
| 290 | 330 | 70×36 | 70 | 0 | +0.074 | 0.100 | +0.220 | -0.074 | 0 | -0.037 | +0.037 | -0.106 | -0.032 | 22.0 | 22.3 | 14.4 | 14.7 | 1.2 | 1.6 |
| 330 | 380 | 80×40 | 80 | 0 | +0.074 | 0.100 | +0.220 | -0.074 | 0 | -0.037 | +0.037 | -0.106 | -0.032 | 25.0 | 25.3 | 15.4 | 15.7 | 2.0 | 2.5 |
| 380 | 440 | 90×45 | 90 | 0 | +0.087 | 0.120 | +0.260 | -0.087 | 0 | -0.043 | +0.043 | -0.124 | -0.037 | 28.0 | 28.3 | 17.4 | 17.7 | 2.0 | 2.5 |
| 440 | 500 | 100×50 | 100 | 0 | +0.087 | 0.120 | +0.260 | -0.087 | 0 | -0.043 | +0.043 | -0.124 | -0.037 | 31.0 | 31.3 | 19.5 | 19.8 | 2.0 | 2.5 |
平键公制键槽尺寸与公差
表 01. 平键键槽尺寸与公差（来源：BS 4235-1:1972）
半圆键规格
| 键 | 键槽 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 尺寸 | 宽度 (b) | 深度 (t) | 圆角 (r) |
||||||||||
| 公称 | 正常 | 紧/过盈 | 轴 (t1) | 轮毂 (t2) | |||||||||
| 轴 (N9) | 轮毂 (Js9) | 轴/轮毂 (P6) | |||||||||||
| b × h1 × D | 最小 | 最大 | 最小 | 最大 | 最小 | 最大 | 最小 | 最大 | 最小 | 最大 | 最小 | 最大 | |
| 1.0 × 1.4 × 4 | 1 | -0.029 | -0.004 | -0.012 | +0.012 | -0.0031 | -0.006 | 1.0 | 1.1 | 0.6 | 0.7 | 0.16 | 0.08 |
| 1.5 × 2.6 × 7 | 1.5 | -0.029 | -0.004 | -0.012 | +0.012 | -0.0031 | -0.006 | 2.0 | 2.1 | 0.8 | 0.9 | 0.16 | 0.08 |
| 2.0 × 2.6 × 7 | 2.0 | -0.029 | -0.004 | -0.012 | +0.012 | -0.0031 | -0.006 | 1.8 | 1.9 | 1.0 | 1.1 | 0.16 | 0.08 |
| 2.0 × 3.7 × 10 | 2.0 | -0.029 | -0.004 | -0.012 | +0.012 | -0.0031 | -0.006 | 2.9 | 3.0 | 1.0 | 1.1 | 0.16 | 0.08 |
| 2.5 × 3.7 × 10 | 2.5 | -0.029 | -0.004 | -0.012 | +0.012 | -0.0031 | -0.006 | 2.7 | 2.8 | 1.2 | 1.3 | 0.16 | 0.08 |
| 3.0 × 5.0 × 13 | 3.0 | -0.029 | -0.004 | -0.012 | +0.012 | -0.0031 | -0.006 | 3.8 | 4.0 | 1.4 | 1.5 | 0.16 | 0.08 |
| 3.0 × 6.5 × 16 | 3.0 | -0.029 | -0.004 | -0.012 | +0.012 | -0.0031 | -0.006 | 5.3 | 5.5 | 1.4 | 1.5 | 0.16 | 0.08 |
| 4.0 × 6.5 × 16 | 4.0 | -0.030 | 0 | -0.015 | +0.015 | -0.042 | -0.012 | 5.0 | 5.2 | 1.8 | 1.9 | 0.25 | 0.16 |
| 4.0 × 7.5 × 19 | 4.0 | -0.030 | 0 | -0.015 | +0.015 | -0.042 | -0.012 | 6.0 | 6.2 | 1.8 | 1.9 | 0.25 | 0.16 |
| 5.0 × 6.5 × 16 | 5.0 | -0.030 | 0 | -0.015 | +0.015 | -0.042 | -0.012 | 4.5 | 4.7 | 2.3 | 2.4 | 0.25 | 0.16 |
| 5.0 × 7.5 × 19 | 5.0 | -0.030 | 0 | -0.015 | +0.015 | -0.042 | -0.012 | 5.5 | 5.7 | 2.3 | 2.4 | 0.25 | 0.16 |
| 5.0 × 9.0 × 22 | 5.0 | -0.030 | 0 | -0.015 | +0.015 | -0.042 | -0.012 | 7.0 | 7.3 | 2.3 | 2.4 | 0.25 | 0.16 |
| 6.0 × 9.0 × 22 | 6.0 | -0.030 | 0 | -0.015 | +0.015 | -0.042 | -0.012 | 6.5 | 6.8 | 2.8 | 2.9 | 0.25 | 0.16 |
| 6.0 × 11.0 × 28 | 6.0 | -0.030 | 0 | -0.015 | +0.015 | -0.042 | -0.012 | 7.5 | 7.8 | 2.8 | 3.0 | 0.25 | 0.16 |
| 8.0 × 11.0 × 28 | 8.0 | -0.036 | 0 | -0.018 | +0.018 | -0.051 | +0.015 | 8.0 | 8.3 | 3.3 | 3.5 | 0.40 | 0.25 |
| 10.0 × 13.0 × 32 | 10.0 | -0.036 | 0 | -0.018 | +0.018 | -0.051 | +0.015 | 10.0 | 10.3 | 3.3 | 3.5 | 0.4 | 0.25 |
表 02. 半圆键公制键槽尺寸与公差
制造工艺