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 ToleranceASTMA554≦12.70.51-1.24+/-0.10+/-10%+4.8-012.7-25.40.51-1.65+/-0.131.65-3.40+/-0.2525.4-38.10.64-1.65+/-0.201.65-3.40+/-0.2538.1-50.80.64-1.24+/-0.251.24-2.11+/-0.282....