锥形螺栓，外形是锥形的螺栓，用以将发动机连接到飞机结构上。

Cone bolt, a bolt in the shape of a cone for engine attachment to the airplane structure.

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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。

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.

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螺栓下部呈圆锥形。

The lower part of the bolt is conical.

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