What is a Screw Jack? Jan 20 , 2026
A screw jack is a commonly used linear transmission device, primarily used to convert the rotary motion of a motor into linear motion. It is widely used in equipment across various industries. Let's learn about the components and operating principle of a screw jack!

First, let's introduce the trapezoidal screw jack. These products come in two structural forms: one with screw movement and the other with nut movement. Customers can choose the appropriate structural form based on their working conditions.

Principle
The main components of a screw jack are a worm gear, a worm, a lead screw, and other parts. The worm gear drives the lead screw to achieve functions such as lifting, lowering, pushing, and tilting. Its reduction mechanism is a worm gear drive. The drive source (motor or handwheel) is connected to the worm, which drives the worm gear to achieve speed reduction. The worm gear and the lead screw are connected by an internal thread or a key, realizing the linear motion of the lead screw (or nut).

Features: The trapezoidal screw jack is characterized by its self-locking function, load capacity ranging from 2.5t to 120t, maximum input speed of 1500r/min, maximum lifting speed of 2.7m/min, long service life, and direct drive by electric, manual, or other power sources. It boasts high stability, operates in environments from -20℃ to 100℃, and lifting height can be customized to user requirements. It is widely used in various industries including machinery, metallurgy, water conservancy, chemical, medical, sanitation, and culture. The ball screw achieves motion through the friction of internal rolling balls. Compared to traditional sliding screw pairs, its driving torque is only 1/3. The numerous rolling balls between the ball screw shaft and nut result in high motion efficiency. This high efficiency translates to low power loss, significantly improving energy savings.

For more details, please visit the "Lude Transmission" website or contact us via private message. Lude Transmission has focused on linear transmission for over ten years and can provide 2D drawings and 3D models. Welcome your inquiries!
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