GB/T3639冷拔精密无缝钢管加工

按GB/T3639冷拔精密无缝钢管的标准:外径4-30的公差为±0.08

尺寸公差(壁厚偏差±5%)
内径尺寸	H8	H9	H10
30	+0.033 0	+0.052 0	+0.084 0
>30-50	+0.039 0	+0.062 0	+0.100 0
>50-80	+0.046 0	+0.074 0	+0.120 0
>80-120	+0.054 0	+0.087 0	+0.140 0
>120-180	+0.063 0	+0.100 0	+0.160 0
>180-250	+0.072 0	+0.115 0	+0.185 0
>250-315	+0.081 0	+0.130 0	+0.210 0
>315-400	+0.089 0	+0.140 0	+0.230 0