Coaxial locking terminals are specialized connectors designed with a secure locking mechanism to ensure stable, vibration-resistant connections in coaxial cable systems. These terminals prevent accidental disconnection due to mechanical stress, environmental vibration, or thermal expansion, making them essential in high-reliability applications such as aerospace, automotive, and industrial RF systems.

The locking mechanism varies by terminal type but is engineered to provide consistent contact pressure. Threaded locking terminals (e.g., N-type, SMA) use a screw-on design, where the connector’s body is twisted onto a mating jack, creating a tight seal. The threads are precision-machined to ensure uniform torque (typically 8-12 in-lbs for SMA, 15-20 in-lbs for N-type), preventing over-tightening that could damage the connector or cable. Bayonet locking terminals (e.g., BNC, TNC) use a lug-and-slot system: the connector is pushed onto the jack and twisted a quarter-turn, engaging spring-loaded pins that lock it in place, combining speed with security.

Many coaxial locking terminals feature environmental sealing, with O-rings or gaskets made of silicone or fluorocarbon rubber that create a waterproof and dustproof seal (up to IP67 or higher). This is critical for outdoor applications, such as cellular base station antennas or marine communication systems, where exposure to moisture, salt, or debris could degrade signal quality.

In high-vibration environments like automotive radar systems or industrial machinery, locking terminals prevent micro-movement between the connector and cable, which can cause intermittent signal loss or increased insertion loss. The terminals are often made of robust materials—brass or stainless steel housings with gold or nickel plating—to resist corrosion and ensure long-term conductivity.

Coaxial locking terminals are also designed for repeatable connections, maintaining consistent impedance (50 or 75 ohms) even after multiple mating cycles (up to 500 for precision models). This reliability makes them indispensable in test and measurement equipment, where frequent connection/disconnection is required without compromising signal accuracy. Whether in harsh industrial settings or precision electronics, these terminals ensure that coaxial connections remain stable under challenging conditions.

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