方螺母的俯视图。选择框代表螺纹直径。
Top view of square nut. Selection box represents thread diameter.
如：不锈钢圆管、方管、矩管、压花管、螺纹管、镀铂金管等。
Such as: stainless steel pipe, square pipe, rectangular pipe, embossed pipe, threaded pipe, platinum-plated tube.
用附加有该变螺距螺纹加工装置的普通车床，可以十分方便地加工出符合质量技术要求的变螺距螺纹螺杆。
The reformed lathe can machine the varying pitch screw bolt according to the require of quality and technology.
另一方面，NPTF螺纹的设计用于保证在整个牙形上产生足够的变形以生成这种机械密封。
On the other hand, NPTF threads are designed to ensure that sufficient crushing of the entire thread form will take place to produce a mechanical seal.
按连接方工可分为螺纹式连接、法兰连接和焊接式三种。
By connecting work can be divided into the thread side connections, flange connections and welding-type three.
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.
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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