5550| 14
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熱處理完再 車螺紋 M72X4 ,可以嗎,用何刀具? |
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點(diǎn)評
書上說了 調(diào)質(zhì)鋼具有良好的綜合力學(xué)性能
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點(diǎn)評
負(fù)10~20絲就行了,關(guān)鍵看你那螺紋精度等級
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