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螺纹的制造通常采用机加工或手工攻削的方法。一般机械制造厂对螺纹的检验不十分重视,往往用做好的螺母来配拧,看松紧配合是否合适。牙形也只用肉眼观察或用螺纹规来对一下。但对于精密的螺纹,有一定的技术要求,螺纹的中径标有公差,必须按要求检验中径。我国已颁布了普通螺纹的6个新标准。新标准的螺纹标注方法与旧标准不同,新标准要求标出螺纹中径、顶径的公差带代号,此外,还要标注旋合长度代号:L表示长型旋合长度;S为短型旋合长度;N为中等旋合长度。对于中等旋合长度可以不标注。
Thread manufacturing is usually machined or hand tapping method. General machinery factory on the thread inspection is not very seriously, often with a good nut to match the screw, to see whether the tight fit. Teeth only with the naked eye or thread gauge to look at it. However, for precision threads, there are certain technical requirements, the diameter of the thread marked with tolerances, the diameter must be checked as required. China has promulgated six new standards for ordinary threads. The new standard thread marking method is different from the old standard, the new standard requires marking the diameter of the thread diameter, the top diameter of the tolerance zone code, in addition, we should also mark the screw length code: L said the long screw length; S short screw Co-length; N is medium co-rotation length. For medium spin length can not be marked.