直径d
(或边长a)
| ／mm | 精度组别 | 截面面积／cm² | 理论质量(kg／m) | |||||
| 1组 | 2组 | 3组 | ||||||
| 圆 钢 | 方 钢 | 圆 钢 | 方 钢 | |||||
| 允许偏差／mm | ||||||||
| 5.5 | ±0.20 | ±0.30 | ±0.40 | ..2375 | 0.30 | 0.186 | 0.237 | |
| 6 | 0.2827 | 0.36 | 0.222 | 0.283 | ||||
| 6.5 | 0.3318 | 0.42 | 0.260 | 0.332 | ||||
| 7 | 0.3848 | 0.49 | 0.302 | 0.385 | ||||
| 8 | ±0.25 | ±0.35 | ±0.40 | 0.5077 | 0. | 0.395 | 0.502 | |
| 9 | 0.6362 | 0.81 | 0.499 | 0.636 | ||||
| 10 | 0.7854 | 1.0 | 0.617 | 0.785 | ||||
| *11 | 0.9503 | 1.21 | 0.746 | 0.95 | ||||
| 12 | 1.131 | 1.44 | 0.888 | 1.13 | ||||
| 13 | 1.327 | 1.69 | 1.04 | 1.33 | ||||
| 14 | 1.539 | 1.96 | 1.21 | 1.54 | ||||
| 15 | 1.767 | 2.25 | 1.39 | 1.77 | ||||
| 16 | 2.011 | 2.56 | 1.58 | 2.01 | ||||
| 17 | 2.270 | 2. | 1.78 | 2.27 | ||||
| 18 | 2.545 | 3.24 | 2.00 | 2.54 | ||||
| 19 | 2.835 | 3.61 | 2.23 | 2.83 | ||||
| 20 | 3.142 | 4.00 | 2.47 | 3.14 | ||||
| 21 | ±. 30 | ±. 40 | ±. 50 | 3.4 | 4.41 | 2.72 | 3.46 | |
| 22 | 3.801 | 4.84 | 2.98 | 3.80 | ||||
| *23 | 4.155 | 5.29 | 3.26 | 4.15 | ||||
| 24 | 4.524 | 5.76 | 3.55 | 4.52 | ||||
| 25 | 4.909 | 6.25 | 3.85 | 4.91 | ||||
| 26 | 5.309 | 6.76 | 4.17 | 5.31 | ||||
| *27 | 5.726 | 7.29 | 4.49 | 5.72 | ||||
| 28 | 6.158 | 7.84 | 4.83 | 6.15 | ||||
| *29 | 6.605 | 8.41 | 5.18 | 6.60 | ||||
| 30 | 7.069 | 9.00 | 5.55 | 7.06 | ||||
| *31 | ±0.40 | ±0.50 | ±0.60 | 7.548 | 9.61 | 5.93 | 7.54 | |
| 32 | 8.042 | 10.24 | 6.31 | 8.04 | ||||
| *33 | 8.553 | 10. | 6.71 | 8.55 | ||||
| 34 | 9.097 | 11.56 | 7.13 | 9.07 | ||||
| *35 | 9.621 | 12.25 | 7.55 | 9.62 | ||||
| 36 | 10.18 | 12.96 | 7.99 | 10.2 | ||||
| 38 | 11.34 | 14.44 | 8.90 | 11.3 | ||||
| 40 | 12.57 | 16.00 | 9.86 | 12.6 | ||||
| 42 | 13.85 | 17. | 10.9 | 13.8 | ||||
| 45 | 15.90 | 20.25 | 12.5 | 15.9 | ||||
| 48 | 18.10 | 23.04 | 14.2 | 18.1 | ||||
| 50 | 19. | 25.00 | 15.4 | 19.6 | ||||
| 53 | ±0.60 | ±. 70 | ±0.80 | 22.06 | 28.09 | 17.3 | 22.. | |
| *55 | 23.76 | 30.25 | 18.6 | 23.7 | ||||
| 56 | 24.63 | 31.36 | 19.3 | 24.6 | ||||
| *58 | 26.42 | 33. | 20.7 | 26.4 | ||||
| 60 | ±. 60 | ±. 70 | ±0.80 | 28.27 | 36.00 | 22.2 | 28.3 | |
| 63 | 31.17 | 39.69 | 24.5 | 31.2 | ||||
| *65 | 33.18 | 42.25 | 26.. | 33.2 | ||||
| *68 | 36.32 | 46.24 | 28.5 | 36.3 | ||||
| 70 | 38.48 | 49.00 | 30.2 | 38.5 | ||||
| 75 | 44.18 | 56.25 | 34.7 | 44.2 | ||||
| 80 | 50.27 | .00 | 39.5 | 50.2 | ||||
| 85 | ±. 9 | ±1.0 | ±1.1 | 56.75 | 72.25 | 44.5 | 56.7 | |
| 90 | 63.62 | 81.00 | 49.9 | 63.6 | ||||
| 95 | 70.88 | 90.25 | 55.6 | 70.8 | ||||
| 100 | 78.54 | 100.00 | 61.7 | 78.5 | ||||
| 105 | 86.59 | 110.25 | 68.0 | 86.5 | ||||
| 110 | 95.03 | 121.00 | 74.6 | 95.0 | ||||
| 115 | ±1.2 | ±1.3 | ±1.4 | 103.82 | 132.26 | 81.5 | 104 | |
| 120 | 113.10 | 144.00 | 88.8 | 113 | ||||
| 125 | 122.72 | 156.25 | 96.3 | 123 | ||||
| 130 | 132.73 | 169.00 | 104 | 133 | ||||
| 140 | 153.94 | 196.00 | 121 | 154 | ||||
| 150 | 176.72 | 225.00 | 139 | 177 | ||||
| 160 | - | - | ±2.0 | 201.06 | 256.00 | 158 | 201 | |
| 170 | 226.98 | 2.00 | 178 | 227 | ||||
| 180 | 254.47 | 324.00 | 200 | 254 | ||||
| 190 | 283.53 | 361.00 | 223 | 283 | ||||
| 200 | - | - | ±2.5 | 314.16 | 400.00 | 247 | 314 | |
| 220 | 380.13 | - | 298 | - | ||||
| 250 | 490.88 | - | 385 | - | ||||
