In the field of electrical connections, cable glands are key components that ensure the safe and stable operation of cables. Different types of cable glands are suitable for different application scenarios. Today, we will take a detailed look at the common types of cable glands: M, PG, NPT, and G.
1、M-Type Cable Glands
M-type cable glands use metric threads, usually measured in millimeters (mm), with a 60-degree equilateral thread profile. This thread profile design allows for even force distribution during connection, providing a relatively stable connection effect. Due to its strong versatility, it is widely used in most parts of the world. From household electrical equipment to various instruments and meters in industrial automation production lines, M-type cable glands can be seen. In some small electrical control cabinets, specifications such as M16 and M20 glands are often used to connect control cables, ensuring the sealing and fixation between the cable and the cabinet.
2、PG-Type (German Thread) Cable Glands
PG-type cable glands feature German threads with a thread angle of 80 degrees. This unique thread angle design gives it better anti-loosening performance when subjected to vibration and impact. It is mainly used in industrial equipment, mechanical equipment and other fields in Europe. In some high-end machine tools produced in Germany, PG-type cable glands are often used to connect power cables and control cables, ensuring the reliability of cable connections during high-speed operation and frequent start-stop of the machine tools.
3、NPT-Type (American Thread) Cable Glands
NPT-type cable glands adopt American tapered threads with a thread angle of 60 degrees. The outer diameter of the thread has a taper, which makes the sealing performance better as the thread is tightened during installation. It is mainly applicable in North America, as well as industries with extremely high sealing requirements such as chemical, marine and petroleum. On offshore oil drilling platforms, since the equipment is in a harsh marine environment for a long time and needs to withstand seawater erosion and wind and wave impact, NPT-type cable glands are widely used in cable connections of various electrical equipment to ensure the sealing and fixation of cables in complex environments.
4、G-Type (British Pipe Thread) Cable Glands
G-type cable glands are British pipe threads with a thread angle of 55 degrees and are straight threads. They are mainly suitable for Japan and South America, and have important applications in aerospace, shipbuilding and military fields. In shipbuilding, G-type cable glands are often used to connect cables of electrical equipment on board. Their good sealing performance and mechanical properties can meet the needs of ships when sailing at sea in harsh environments such as humidity and salt spray.
Different types of cable glands vary in thread angle, thread characteristics and application scenarios. In actual selection and use, we need to comprehensively consider factors such as specific engineering requirements, the region where the equipment is located and industry standards to determine the most suitable type of cable gland, so as to ensure the safe and stable operation of the electrical system.For more detailed thread introduction, you can search in the following website:https://www.iso.org/home.html
