The joint M25×1.5 represents a thread specification commonly used in cable glands and various mechanical and electrical applications. The specific meanings are as follows: “M” indicates the metric thread, which is widely adopted in cable gland designs for its standardization and compatibility. “25” indicates that the major diameter of the thread is 25 millimeters, a crucial dimension when selecting the appropriate cable gland to ensure a proper fit with the cable and the equipment it connects to. “1.5” indicates that the pitch of the thread is 1.5 millimeters, that is, the axial distance between two corresponding points on the pitch diameter line of adjacent threads is 1.5 millimeters. Whether a large or small thread pitch is better depends on the specific application scenarios, especially in the context of cable glands, and it cannot be simply determined which is better.
Characteristics and Advantages of a Large Thread Pitch in Cable Glands
- Quick Assembly and Disassembly
- In the realm of cable glands, a large thread pitch means that the cable gland can be installed or removed more rapidly. When dealing with cable installations that require frequent changes or adjustments, such as in temporary set – ups for events or quick maintenance operations on cable systems, large – pitch threaded cable glands can save significant time. For example, in a large – scale industrial cable installation project where multiple cable glands need to be installed on different cables in a short period, using cable glands with a large thread pitch can streamline the process.
- Relatively High Load – Bearing Capacity
- Cable glands with a large thread pitch are often designed to be more robust. They can better withstand the mechanical stress and tension that cables may experience during operation. In heavy – duty cable applications, such as in power plants or large – scale industrial machinery where cables carry high – voltage electricity or large – volume data, cable glands with a large thread pitch can ensure a secure connection and prevent the cable from being pulled out due to excessive force.
Disadvantages of a Large Thread Pitch in Cable Glands
- Relatively Low Precision Requirements
- For cable glands, a large thread pitch may lead to less precise connections. In applications where cable alignment and tight – fitting are crucial, such as in high – frequency communication cables or precision electrical equipment, the coarser thread of a large – pitch cable gland may not provide the necessary precision. For instance, in a fiber – optic cable installation where the slightest misalignment can cause signal loss, a cable gland with a large thread pitch may not be the best choice.
- Relatively Poor Self – Locking Performance
- Cable glands with a large thread pitch have a larger helix angle, resulting in relatively poor self – locking performance. In environments with vibrations, such as in transportation vehicles or industrial machinery with moving parts, cable glands with a large thread pitch may loosen over time. This can pose a risk to the integrity of the cable connection, potentially leading to electrical failures or data transmission issues. To mitigate this, additional locking mechanisms may need to be employed for cable glands with a large thread pitch.
Characteristics and Advantages of a Small Thread Pitch in Cable Glands
- High Precision
- Small – pitch threaded cable glands offer high precision in cable connections. In applications where accurate positioning and a tight seal are essential, such as in medical equipment cables or aerospace cable systems, cable glands with a small thread pitch can ensure a perfect fit. They can prevent moisture, dust, and other contaminants from entering the cable connection, which is critical for the reliable operation of the equipment.
- Good Self – Locking Performance
- Cable glands with a small thread pitch have a smaller helix angle, providing excellent self – locking performance. In cable installations exposed to vibrations or external forces, such as in offshore oil rigs or wind turbines, cable glands with a small thread pitch can maintain a secure connection without the need for additional locking devices in many cases. This enhances the reliability and safety of the cable system.
Disadvantages of a Small Thread Pitch in Cable Glands
- Slow Assembly and Disassembly Speed
- When installing or removing cable glands with a small thread pitch, the process is slower due to the smaller advancement per revolution. In large – scale cable installation projects with a high volume of cable glands to be installed, this can significantly increase the installation time and labor costs. For example, in a data center construction project where thousands of cable glands need to be installed, the slow assembly speed of small – pitch cable glands can become a bottleneck.
- Relatively Low Load – Bearing Capacity
- Cable glands with a small thread pitch usually have a thinner thread profile, which may result in a relatively lower load – bearing capacity. In applications where cables are subject to high tensile forces, such as in large – span power transmission lines or heavy – duty mining cable systems, small – pitch cable glands may not be able to withstand the forces as well as large – pitch ones. Therefore, careful consideration is needed when choosing the appropriate cable gland based on the load requirements.
