無錫精密鋼管廠-直徑5mm壁厚1mm鋼管價(jià)格
尺寸公差對照表 | ||||
外徑尺寸范圍 |
GB/T3639(GB8713) |
DIN2391(EN10305) |
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特殊范圍 |
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壁厚公差范圍 |
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