In the vast field of engineering technology, threads play an indispensable role as key elements for connecting and fixing various components. They are not only diverse, but each type has its unique characteristics and application scenarios.
This article aims to explore in depth the differences between metric threads (M threads) and British non sealed pipe threads (G threads), and to explain their advantages and limitations in practical applications.
1、 Analysis of Metric Thread (M Thread)
Metric thread, also known as metric thread, is a standard thread system that originated in Europe and is widely used. Its core feature is that its tooth profile angle is 60 °, which makes the thread profile more stable and able to withstand greater shear and tensile forces.
In addition, metric threads are non sealed, meaning they do not have a tapered design, which means they are mainly suitable for straight pipe connections that do not require additional sealing measures.
Another major advantage of metric threads is their standardized size system. Due to the adoption of a unified standard, metric threaded components produced by different manufacturers can be easily interchanged and matched, greatly improving production efficiency and compatibility. However, it is worth noting that due to the lack of sealing function of metric threads themselves, additional seals or sealants are often required to prevent leakage in some situations.
2、 Discussion on British non sealed pipe thread (G thread)
Corresponding to metric threads is the British non sealed pipe thread (G-thread), which is a standard thread type widely used in countries such as the United States and Canada. The significant feature of G-thread is its tooth profile angle of 55 °, which gives it different mechanical properties and sealing effects compared to metric threads.
Similar to metric threads, G threads are also non sealed threads, meaning they do not have a taper design. However, it is worth noting that although the G thread itself does not directly provide sealing function, its specific size and shape enable it to form a relatively tight contact surface when matched with corresponding accessories, thereby improving the sealing performance of the connection to a certain extent.
In addition, the diameter of G-threads is usually marked in inches (such as 1/4, 1/2, 1/8, etc.), which is a very common and easy to understand representation in the imperial system.
However, it should be pointed out that G threads may be subject to some limitations in practical applications. Due to its smaller tooth profile angle (55 °), G threads may not be as stable as metric threads when subjected to shear and tensile forces. In addition, the sealing performance of G threads may be affected in high-pressure or high-temperature environments, and additional measures need to be taken to ensure the reliability of the connection.