core bolt 锚定螺栓
hollow core rock bolt 空心岩栓
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Bolt hole fitting plastic core industrial caster.
孔顶塑芯工业脚轮。
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Based on bolt looseness broken analysis for railway wagon core plate, puts forward the preventive measures.
针对铁路货车心盘螺栓松动折断的问题，分析其原因，并提出防范措施。
The fastening bolt is fixed with the inner core.
紧固螺栓与内芯紧固。
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