Hebei jiali Rigging Manufacturing Co., Ltd.
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◆◆ Product Advantage
Industrial-Grade Strength & Load-Bearing Excellence
Crafted with high-strength alloy steel, our mechanical screw jacks feature a reinforced helical gear system that delivers unmatched load-bearing capacity. Available in 12-ton and 16-ton models, these jacks boast a safety factor of 3:1, ensuring stability even under extreme pressure. The precision-machined threads and heat-treated components minimize wear, making them ideal for heavy machinery maintenance, construction sites, and industrial lifting tasks. With a 100,000+ cycle lifespan under rated loads, they outperform standard jacks in durability and reliability.
Keywords: Heavy-duty mechanical screw jack, high-strength alloy steel jack, industrial-grade load-bearing capacity
Effortless Operation with Ergonomic Design
The low-friction, self-locking worm gear mechanism requires 60% less manual force than conventional jacks, reducing operator fatigue during prolonged use. The contoured handle (18-inch extended reach) offers maximum leverage, enabling smooth, single-handed lifting even at full capacity. The non-slip rubberized base and stable tripod structure prevent wobbling, ensuring precise positioning for accurate height adjustment—perfect for automotive repair, equipment installation, or architectural applications.
Keywords: Ergonomic mechanical screw jack, low-friction worm gear jack, easy-operation manual jack
Advanced Safety Features for Peace of Mind
Built with dual safety systems: a mechanical locking pin and a spring-loaded release valve to prevent accidental lowering. The reinforced steel frame resists corrosion (IP65-rated coating) and impact, while the wide-base design distributes weight evenly, minimizing tipping risks. All models undergo rigorous 30,000-cycle load testing and meet ISO 21409 standards, ensuring compliance with global safety regulations for industrial and commercial use.
Keywords: Safe mechanical screw jack, ISO-certified jack, anti-slip base jack
All-Terrain Durability & Low Maintenance
The robust cast-iron housing and galvanized surface treatment protect against rust, moisture, and chemical exposure, ideal for harsh environments like garages, shipyards, or outdoor construction. The self-lubricating gear system eliminates the need for frequent oiling, while the tool-free disassembly design simplifies maintenance—saving time and reducing downtime. Weighing just 45 lbs (12-ton model), it balances portability with heavy-duty performance, making it a versatile choice for professionals on the go.
Keywords: Durable mechanical screw jack, low-maintenance jack, corrosion-resistant jack
Versatile Compatibility for Every Scenario
Available in 2-ton to 16-ton increments, our screw jacks accommodate diverse lifting needs—from compact vehicles and machinery parts to large industrial equipment. The height-adjustable saddle (12-inch stroke range) fits uneven surfaces, while the modular base design allows pairing with extension brackets for extended reach. Whether used in automotive workshops, manufacturing plants, or DIY projects, these jacks deliver consistent performance across applications, ensuring reliability as your go-to lifting solution.
Keywords: Versatile mechanical screw jack, multi-tonnage jack, heavy-duty lifting solution
By combining engineering precision with user-centric design, our mechanical screw jacks set a new standard for safety, efficiency, and durability. Trust in proven performance to elevate your operations—wherever heavy lifting meets reliability.
Note: Data verified through third-party testing labs; contact us for customized load specifications and bulk order inquiries.
◆◆ Technical Parameters
| Model | MJ-12T (12-ton capacity) / MJ-16T (16-ton capacity) |
| Rated Load | 12,000kg (MJ-12T) |
| Max. Safe Load | 16,000kg (MJ-16T) |
| Lifting Height | 300mm (standard stroke) + 50mm (optional extended stroke) |
| Lifting Precision | ±0.5mm per 100mm stroke |
| Operating Force | 200N (MJ-12T, handle length: 1.2m) |
| Self-Locking Force | ≥1.5× rated load (static) |
| Safety Factor | ≥3:1 (static) / ≥2:1 (dynamic) |
| Anti-Reversal Mechanism | Dual ratchet lock (mechanical + spring-loaded) |
| Overload Protection | Mechanical limit switch (auto-locks at 10% overload) |
| Main Body Material | - Frame: Q345B low-alloy high-strength steel - Gear: 20CrMnTi alloy steel (transmission parts) |
| Surface Treatment | Hot-dip galvanizing (zinc layer ≥80μm) + powder coating (color customizable) |
| Welding Process | CO₂ gas shielded welding (UT/MT flaw detection for welds) |
| Operating Temperature | -20℃ ~ +80℃ (standard) -40℃ ~ +120℃ (cold/heat-resistant variants) |
| Protection Class | IP65 (dustproof and water-resistant) |
| Altitude Limit | ≤4,000m (non-plateau model) |
| Height Adjustment | Fixed (non-adjustable) |
| Base Design | Adjustable anti-slip rubber pads (4 leveling feet) |
| Maintenance Cycle | - Lubrication: Every 500 hours (molybdenum disulfide grease) - Overhaul: Every 2 years |
◆◆ Product Uses
1. Automotive Repair & Maintenance
Widely used for tire replacement, underframe maintenance, and other automotive tasks. With a load-bearing capacity typically covering 1–5 tons, it suits passenger cars, SUVs, and light-duty trucks. Its simple operation and no-external-power-required design make it a must-have tool for repair shops and vehicle owners.
2. Industrial Equipment Maintenance
In factories and workshops, it supports heavy machinery (e.g., machine tools, production line components) during inspection, debugging, or part replacement. High stability (e.g., 16-ton models) handles long-term static loads, preventing equipment tilting risks—ideal for compact industrial spaces.
3. Construction & Engineering Projects
Used for bridge bearing adjustment, small component lifting/positioning, or temporary support during wall masonry. The mechanical screw structure provides uniform lifting force, while scale rulers enable precise height control, meeting construction demands for vertical support accuracy and safety.
4. Marine & Vehicle Rescue
Supports ship hulls during underwater maintenance or underframe part repairs, or lifts stranded vehicles (e.g., stuck cars) to escape difficult situations. Its corrosion-resistant coating adapts to humid, dusty outdoor environments, ensuring reliable use in harsh conditions.
5. Warehousing & Logistics Handling
When moving heavy goods (e.g., shelves, container components), it adjusts the center of gravity or lifts the cargo base to facilitate forklift access. Its compact body fits narrow aisles, and manual operation avoids electromagnetic interference—enhancing safety and flexibility in warehouse operations.
◆◆ Product Operate Guide
1. Confirm the load does not exceed the rated capacity (12T/16T). Place the jack on flat, solid ground and align it with the center of the heavy object.
2. Rotate the handle clockwise to lift the object; stop applying force once the desired height is reached. Rotate counterclockwise to lower.
3. Check the seal before use, apply force steadily during operation, reset the handle, and store properly after use.
◆◆ Product Video
◆◆ FAQ
Q1: Will the jack suddenly drop during lifting?
Our jacks feature a self-locking worm gear mechanism with a safety factor of ≥3:1, preventing accidental lowering under rated loads. Overload protection (10% excess load auto-lock) and stable base plates further ensure safety. Regular maintenance (e.g., checking screw tightness) minimizes risks.
Q2: What’s the maximum safe load for my jack?
Check the labeled "Rated Load" (e.g., 12T/16T). The dynamic load limit is typically 80% of the rated value to avoid long-term wear. Never exceed this, as overloading may damage the screw or gear system.
Q3: How often should I maintain the jack?
Perform daily checks: inspect screws for wear, clean debris, and test self-locking. Lubricate gears with high-quality grease every 500 hours (or quarterly). Annual professional inspection is recommended to ensure structural integrity.
Q4: Can it be used in outdoor/rainy environments?
Yes—models with IP65 protection (dust/water splash-resistant) and galvanized steel bodies resist moisture. Avoid prolonged submersion; wipe dry after use in rain. For extreme conditions (e.g., coastal areas), choose corrosion-resistant coatings.
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