What's the diameter tolerance and thickness tolerance of ASTM A554 standard
Standard for the Round tube
| 圆管尺寸公差 SIZE TOLERANCE OF ROUND TUBES | |||||
| 标准 Standard | 外径（mm) Outside Diameter | 厚度（mm) Thickness | 外径公差（mm) Outer Diameter Tolerance | 厚度公差（mm) Thickness Tolerance | 长度公差（mm) Length Tolerance |
| ASTM A554 | ≦12.7 | 0.51-1.24 | +/-0.10 | +/-10% | +4.8-0 |
| >12.7-25.4 | 0.51-1.65 | +/-0.13 | |||
| >1.65-3.40 | +/-0.25 | ||||
| >25.4-38.1 | 0.64-1.65 | +/-0.20 | |||
| >1.65-3.40 | +/-0.25 | ||||
| >38.1-50.8 | 0.64-1.24 | +/-0.25 | |||
| >1.24-2.11 | +/-0.28 | ||||
| >2.11-3.78 | +/-0.30 | ||||
| >50.8-63.5 | 0.81-1.65 | +/-0.30 | |||
| >1.65-2.77 | +/-0.33 | ||||
| >63.5-88.9 | >2.77-4.19 | +/-0.36 | |||
| 0.81-1.19 | +/-0.36 | ||||
| >88.9-127.0 | 0.89-4.19 | +/-0.51 | |||
| >4.19 | +/-0.64 | ||||
| >127.0-190.5 | 1.24-6.35 | +/-0.64 | |||
| >6.35 | +/-0.76 | ||||
Standard for square and rectangular tube
| 方管，矩形管尺寸公差 SIZE TOLERANCE OF SQUARE AND RECTANGULAR TUBE | |||||
| 最大角度 Max Radii of Corners | 外径公差（mm) Outside Tolerance | 扭角Twist tolerance | |||
| 厚度（mm) wall thickness | 最大角度（mm) Radii of Corners, Max | Largest Normal Outside Diamension | Across Flats Convexity or Comcavity | 外径（mm) Outside Diameter | 公差(mm) Tolerance |
| >0.51-1.24 | 2.4 | ≦31.80 | +/-0.38 | ≦12.70 >12.70-38.10 >38.1-63.5 >63.5-101.6 >101.60-152.40 >152.40 | 1.53 2.30 2.84 3.82 7.54 11.37 |
| >1.24-1.65 | 3.2 | ||||
| >1.65-2.11 | 3.6 | >31.80-63.5 | +/-0.51 | ||
| >2.11-2.42 | 4.8 | ||||
| >2.42-2.77 | 5.2 | >63.5-139.70 | +/-0.76 | ||
| >2.77-3.40 | 5.6 | ||||
| >3.40-3.96 | 6.4 | >139.70-203.20 | +/-1.52 | ||
| >3.96-5.08 | 9.5 | ||||
| >5.08-6.35 | 12.7 | ||||