This section provides overview, applications, and principles of screw thread gages. Also, please take a look at the list of 12 screw thread gage manufacturers and their company rankings.
A thread gauge is an inspection tool used to check whether a "male thread" or "female thread" is manufactured in the correct shape by default. Ring-type gauges are used to measure male threads. They are used widely in the thread manufacturing field.
The shape of a screw is standardized, but there are various specifications. For example, thread outer diameter, effective diameter, thread pitch, and thread valley diameter. Measuring these parameters one by one is time-consuming. However, by using a thread gauge it is possible to quickly determine whether a manufactured thread shape is acceptable or not.
The use of a thread gauge enables the quick determination of whether the manufactured thread shape is good or bad. Because it improves operational efficiency, they are very vital to the thread manufacturing field.
The principle of thread gauges differs depending on the type of thread gauge. The screw gauges commonly used in manufacturing are as follows.
The limit thread gauge is an inspection jig to determine whether the manufactured thread shape is acceptable easily. Using gauges made to the upper and lower limit specifications of the threads to be inspected, the gauges determine whether the thread shape is good or bad by passing through one gauge, not the other.
For male threads such as bolts, the ring gauge on the upper end of the thread standard will pass the ring gauge and the ring gauge on the lower end of the thread standard will not. For nuts and other female threaded products, we confirm that they will pass the plug gauge at the lower end of the thread standard, but will not pass the plug gauge at the upper end of the thread standard. Also, the standard here refers specifically to the effective diameter of the screw.
The wear inspection thread gauge is a gauge used to guarantee the accuracy of the limit thread gauge. The limit thread gauges wear out as they are passed through the inspected object in the inspection. As the amount of wear increases, it becomes impossible to make correct judgments.
Therefore, the wear inspection thread gauge is used to check whether the limit thread gauge has not exceeded the wear limit for correct inspection. A ring gauge for wear inspection is used to inspect the wear of the limit screw plug gauge, and a plug gauge for wear inspection is used to inspect the wear of the limit screw ring gauge.
A thread gauge made according to the standard thread profile and standard dimensions of a thread standard, which consists of a plug gauge and a ring gauge. It is the standard thread gauge for measurement. Compared to the limit thread gauges, the quality assurance accuracy is inferior. However, it is not necessary to prepare a set of both thread gauges on the through side and the stop side as is the case with the limit thread gauges. This allows the cost to be kept low.
There are two main types of pipe thread gauges; parallel thread gauges and tapered thread gauges. The parallel thread gauges are used to measure the threads at the threaded end and the tapered end. Thread gauges for tapered threads are notched on the end face and are accepted if the tip of the thread is within the notch.
Thread gauges are broadly classified into ring gauges and plug gauges. From there, they can be classified in detail as described above.
Ring gauges are used to inspect screws. They are called ring gauges because they are ring-shaped. They are also called plug gauges because they have a female thread in the center of the disk so that the screw to be inspected can be screwed in. The brag gauge inspects a female thread itself.
*Including some distributors, etc.
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