... conical indentation hardness 锥形低凹硬度 conical inner body (冲压式喷气发动机进气道中的)中心锥体 conical joint 锥形连接 ...
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The top part of one inner bolt which matches the blank hole channel of the outer hollow screw is also conical. The rear is provided with a thread and a tetragonal body for holding.
一与外空心螺钉的盲孔道相匹配的内螺栓，内螺栓的尖端部位亦为锥形，尾部设有螺纹和供握持用的四方体。
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