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   矩形结构管材的尺寸与特性(1) 
| 尺  寸 | 特  性** |  
| 公称*尺寸 | 壁厚 | 每英尺重量 | 截面积 | X-X轴 | Y-Y轴 |  
| Ix | Sx | rx | Iy | Sy | ry |  
| ln. | ln. | Lb. | ln.2 | ln.4 | ln.3 | ln. | ln.4 | ln.3 | ln. |  
| 20×12 | .5000 | 1/2 | 103.30 | 30.4 | 1650 | 165 | 7.37 | 750 | 125.0 | 4.97 |  
| .3750 | 3/8 | 78.52 | 23.1 | 1280 | 128 | 7.44 | 583 | 97.2 | 5.03 |  
| .3125 | 5/16 | 65.87 | 19.4 | 1080 | 108 | 7.47 | 495 | 82.5 | 5.06 |  
| 20×8 | .5000 | 1/2 | 89.68 | 26.4 | 1270 | 127 | 6.94 | 300 | 75.1 | 3.38 |  
| .3750 | 3/8 | 68.31 | 20.1 | 988 | 98.8 | 7.02 | 236 | 59.1 | 3.43 |  
| .3125 | 5/16 | 57.36 | 16.9 | 838 | 83.8 | 7.05 | 202 | 50.4 | 3.46 |  
| 20×4 | .5000 | 1/2 | 76.07 | 22.4 | 889 | 88.9 | 6.31 | 61.6 | 30.8 | 1.66 |  
| .3750 | 3/8 | 58.10 | 17.1 | 699 | 69.9 | 6.40 | 50.3 | 25.1 | 1.72 |  
| .3125 | 5/16 | 48.86 | 14.4 | 596 | 59.6 | 6.44 | 43.7 | 21.8 | 1.74 |  
| 18×6 | .5000 | 1/2 | 76.07 | 22.4 | 818 | 90.9 | 6.05 | 141 | 47.2 | 2.52 |  
| .3750 | 3/8 | 58.10 | 17.1 | 641 | 71.3 | 6.13 | 113 | 37.6 | 2.57 |  
| .3125 | 5/16 | 48.86 | 14.4 | 546 | 60.7 | 6.17 | 97.0 | 32.3 | 2.60 |  
| 16×12 | .5000 | 1/2 | 89.68 | 26.4 | 962 | 120 | 6.04 | 618 | 103.0 | 4.84 |  
| .3750 | 3/8 | 68.31 | 20.1 | 748 | 93.5 | 6.11 | 482 | 80.3 | 4.90 |  
| .3125 | 5/16 | 57.36 | 16.9 | 635 | 79.4 | 6.14 | 409 | 68.2 | 4.93 |  
| 16×8 | .5000 | 1/2 | 76.07 | 22.4 | 722 | 90.2 | 5.68 | 244 | 61.0 | 3.30 |  
| .3750 | 3/8 | 58.10 | 17.1 | 565 | 70.6 | 5.75 | 193 | 48.2 | 3.36 |  
| .3125 | 5/16 | 48.86 | 14.4 | 481 | 60.1 | 5.79 | 165 | 41.2 | 3.39 |  
| 16×4 | .5000 | 1/2 | 62.46 | 18.4 | 481 | 60.2 | 5.12 | 49.3 | 24.6 | 1.64 |  
| .3750 | 3/8 | 47.90 | 14.1 | 382 | 47.8 | 5.21 | 40.4 | 20.2 | 1.69 |  
| .3125 | 5/16 | 40.35 | 11.9 | 327 | 40.9 | 5.25 | 35.1 | 17.6 | 1.72 |  
| 14×10 | .5000 | 1/2 | 76.07 | 22.4 | 608 | 86.9 | 5.22 | 361 | 72.3 | 4.02 |  
| .3750 | 3/8 | 58.10 | 17.1 | 476 | 68.0 | 5.28 | 284 | 56.8 | 4.08 |  
| .3125 | 5/16 | 48.86 | 14.4 | 405 | 57.9 | 5.31 | 242 | 48.4 | 4.11 |  *指平直边的外部尺寸 **特性是根据外圆角公称半径等于壁厚的两倍计算的。 
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