A screw with threads on the outer surface of a cylinder or cone. A male thread that is used in combination with a female thread (nut) is generally called a bolt. Cutting tools such as turning tools, thread milling cutters, dies, and chasers are used to machine male threads, and for mass production, rolling methods (→ thread rolling machine) are used. For female threads, turning tools, thread milling cutters, and taps are used, but rolling methods like those for male threads cannot be used. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
ねじ山が円筒あるいは円錐外面にあるねじ。おねじのうち,めねじ (ナット) と組んで用いるものは,一般にボルトという。おねじの加工にはバイト,ねじフライス,ダイス,チェーザなどの切削工具が使われ,多量生産では転造加工法 (→ねじ転造盤 ) がとられる。めねじの加工には,バイト,ねじフライスのほかタップなどが用いられるが,おねじのような転造加工法はとれない。
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