In industrial maintenance and heavy object support scenarios, the safety of screw jack operation relies on the natural self-locking characteristics of thread design as its core guarantee. This ingenious mechanical principle becomes a safety barrier for long-term support operations.

The thread self-locking of a screw jack essentially utilizes the mechanical balance between the thread lift angle and the friction angle. When the thread angle is smaller than the friction angle between the screw and nut, even if the external force is removed, the axial force generated by the load cannot be converted into the circumferential force that drives the thread to rotate. This "self-locking effect of force" is like an invisible brake. Once the handle stops rotating, the load is firmly locked in its current position, eliminating any risk of settlement or retraction.

This feature is highly valued in practical assignments. During bridge maintenance, the jack needs to support hundreds of tons of beam structure for a long time, and the self-locking function ensures that the beam remains unchanged during construction gaps or sudden shutdowns; In equipment installation and debugging, the positioning and calibration of precision components often require several hours of stable support, and thread self-locking allows operators to work with peace of mind without the need for continuous monitoring. In high-frequency scenarios such as car maintenance, self-locking characteristics have become the bottom line of life safety, avoiding the hidden danger of vehicle accidental slipping.

Compared to supporting equipment that relies on external braking devices, the self-locking characteristics of screw jacks do not require additional energy consumption or manual monitoring, making them both economical and reliable. This kind of wisdom derived from basic mechanical design has always occupied an irreplaceable safety position in the modern industrial system for screw jacks.