功能指示螺纹规是为了检验通端的最大材料限度及大小及止端的有效直径限度及大小。
Functional Indicating Thread Gage for inspecting the maximum-material GO functional limit and size and the NOT GO functional diameter limit and size.
通过采用合适的对策，有效预防钻铤螺纹失效，从而保证钻铤螺纹的质量可靠性。
The correct countermeasures are taken to prevent the drill collar screw failure effectively, ensuring the qualitative reliability of drill collar screw.
指出了在工程上选用合理的联接结构和防松措施，可有效地提高螺纹联接的可靠性。
In engineering application, selecting reasonable joint structure and prevent loosing method will effectively enhance the reliability of threaded joint.
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