When it comes to digging up the world of thread gauges and external thread inspection, the entire procedure seems very confusing as well as frustrating. For this purpose, a wide variety of tools meant for inspection available online or locally for external thread.

The external threads can be inspected with the special functional thread ring gauges in the category of pass/fail inspection. The threads may also need some kind of measured value that is actual in nature and would be needing thread measuring wires, tri-rolls, require pitch micrometers, laser, or even the or image-based measuring systems.

Thread gauges, thread ring gauges, and all the other such measuring tools have various strengths along with weaknesses. With all such measuring tools, having the knowledge about what you need to measure and what measuring device you are going to use is all you need to be expert in.

The capabilities of instruments like thread gauges and thread ring gauges are very critical along with being accurate when it comes to inspection of the product that has been produced. GO and NO-GO thread ring gauges are very easy to use and understand.

Being a user, you must first select the correct size of the thread ring gauges alike thread gauges. This is for the purpose of corresponding external products that are threaded. This is definitely a critical job but sometimes very hard jobs as drawings and specification requirements frequently gets missing, incomplete, or even incorrect.

Another important point to be an expert while being a user of the thread ring gauges or the thread gauges is to ensure that the most correct TPI (pitch), diameter, Fit Class, along with any special diameters of the pitch; all are very specified.

The user also needs to confirm that the thread gauges or the thread ring gauges are related to the ideal international or national standard. In the USA, it is very common to assume that the types of metric thread gages conform to the best ANSI/ASME B1.16M. On the other hands, this may not be the case particularly when you are working with an international customer or more specifically, a globally recognized company (offering manufacturing qualities).

Other metric standards including the ISO or JIS may also be required. It is very important to confirm that pitch diameters on the thread gauges must match the part specification. Taking an example, a part gaged before the plating will have special pitch diameters to offer. The thread ring gauges selected by the user should be engineered and crafted correctly to the pre-plate or even prior to plate pitch diameters.

The thread ring gauges should be marked as B/P or P/P designation for the purpose of quick and easy identification. Finally, the final step for the inspector is to confirm; the thread gauges are well-calibrated.

It is highly suggested to recheck the thread ring gauges before you use them, with the perfect matching set plug regardless of the calibration of the sticker current status. Many companies arbitrarily opt for the annual frequencies of calibration apart from basing frequency on the usage.