Scaffolding Screw Jack
mechanical screw jack
screw jack for car
screw jack stand
screw jack
worm gear screw jack

Scaffolding Screw Jack

Favorable price, fast delivery, timely service-- ANG is your reliable supplier of transmission solution which is high efficiency, low noise, low temperature rise, long service life, etc.

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Product Introduction

What are the common faults and solutions of the self-locking function of the screw jack?

Fault 1: Screw slips and cannot hold position Causes: Worn trapezoidal thread/worm gear; overload; excessive lubricant on screw; continuous vibration. Solutions: Replace damaged parts; keep load within rated value; clean extra oil; fit external brake for vibrating conditions.

Fault 2: Self-locking fails after long storage Causes: Rust and dirt inside threads and gear meshing area. Solutions: Disassemble, clean and remove rust; refill suitable gear oil and test before use.

Fault 3: Unstable self-locking after frequent lifting Causes: Heat and polished thread surface reduce friction. Solutions: Regular inspection; avoid heavy-load repeated operation; install backup safety locks.

Warning: The screw jack's self-locking depends on thread friction, not an absolute safety brake. Add separate safety locks for vibrating or high-risk applications.

Screw Jack Self‑locking Feature

The self-locking function is one of the core advantages of SWL worm gear scaffolding screw jacks. It relies on trapezoidal screw thread structure. When the lifting screw stops rotating under static load, the screw jack can automatically maintain its position without additional braking device.

This feature makes the equipment stay stable after height adjustment, widely used for platform positioning, scaffolding support and mould holding.

Important reminder: The self-locking capacity only works under static steady load. It cannot fully guarantee safety under dynamic impact, vibration or shock load. For heavy vibrating working conditions, an external brake or safety locking device is recommended for extra protection.

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