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2022
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Production process of threaded connection drill bit
The production process of threaded connection drill bit: steel incoming inspection-steel blanking-processing pants body-processing threads-pants body heat treatment-drilling tooth holes-
Production process of threaded connection drill bit: steel incoming inspection-Steel blanking-Processing pants body-Machining thread-Trouser body heat treatment-Drill a perforation-Alloy tooth-Anti-corrosion treatment-Product Inspection-Packaging warehousing
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