According to our handling experience, there are usually five major problems in the unqualified inspection of Tongqi regulations:

1. Differences between brands of different measuring tools. Different judgments will be made when measuring the same measurement item with different brands of measuring tools. This problem exists in many cases handled by our company. However, according to ASME B1.3M standard, as long as any qualified measuring tool is qualified, it will be judged qualified.

2. Differences in measurement methods. Some customers think it is unqualified, there was a slight resistance that determine not qualified, but are relatively soft, stainless steel threaded vulnerable to collision, so will be a slight resistance, thread detection to judge unqualified thread is not accurate, according to GB/T5779.1 standard description “damage unless you can confirm that weaken function or usability should not be rejected, The twisting torque should not be greater than 0.001d³m·n “, so the use of a little force can be twisted through the gauge should be judged qualified.

3. Wrong accuracy of measuring tools. If the product is 2A precision, the customer uses 3A precision measurement, that will lead to the pass gauge impassability.

4. Old and new gauges are different. For the same product, there will be differences when the new measuring tool and the old measuring tool are used, but as long as the old measuring tool is qualified, according to ASME B1.3M standard, “two qualified ring gauges are tested, and one of them is qualified to judge the batch of products”.

5. The product itself. The product itself thread burr or precision depth size can not meet the requirements, will lead to the problem of stop.