2–4 Rope Mechanical Rock Grabs – Heavy-Duty Clamshell Grabs for Cranes
NG Attachments manufactures heavy-duty
2-rope and 4-rope mechanical rock grabs for cranes used in ports, quarries, mines, construction yards, recycling facilities, and bulk material handling operations. The
NG-MRG Series is designed for handling stone, rock, ore, gravel, scrap, aggregates, and heavy waste with high durability and low maintenance.Our mechanical clamshell grabs are fully rope-operated and do not require hydraulic or electric systems. They are suitable for crawler cranes, gantry cranes, overhead cranes, ship unloaders, and other crane systems equipped with 2-rope or 4-rope lifting and closing mechanisms.
Technical Specifications – NG-MRG Mechanical Rock Grab Series
| Model | Capacity | Shell Width | Closed Height | Approx. Weight | Rope System | Application |
|---|
| NG-MRG1000 | 1.0 m³ | 1100 mm | 1600 mm | 1300 kg | 2-rope | Stone, sand, light bulk materials |
| NG-MRG2000 | 2.0 m³ | 1400 mm | 1900 mm | 2000 kg | 2-rope | Gravel, scrap, aggregates |
| NG-MRG3000 | 3.0 m³ | 1700 mm | 2200 mm | 2800 kg | 4-rope | Ore, rock, heavy bulk materials |
| NG-MRG5000 | 5.0 m³ | 2000 mm | 2500 mm | 4000 kg | 4-rope | Bulk rock, heavy waste, mining materials |
Technical dimensions, capacity, weight, shell geometry, and rope arrangement can be customized according to crane type, material density, working conditions, and customer requirements.
Key Features of NG Mechanical Rock Grabs
- 2-rope and 4-rope operation: Suitable for standard crane lifting and closing rope systems.
- Heavy-duty clamshell design: Reinforced structure for rock, ore, scrap, and abrasive bulk materials.
- High wear resistance: Shells, cutting edges, and wear zones can be manufactured with Hardox, ST52, or equivalent high-strength steels.
- No hydraulic or electric system: Fully mechanical operation provides simple maintenance and reliable performance.
- Custom capacity range: Available from compact sizes up to large-volume grabs for port and mining applications.
- Strong hinge and rope mechanism: Designed for repeated opening and closing cycles under tough working conditions.
Applications
- Rock and stone loading in quarries
- Ore and mineral handling in mining operations
- Bulk cargo loading and unloading in ports
- Scrap and heavy waste handling in recycling yards
- Aggregate transfer for concrete and asphalt plants
- Industrial crane loading and unloading operations
Compatible Crane Types
NG mechanical rope grabs can be designed for different crane systems, including:
- Crawler cranes
- Gantry cranes
- Overhead cranes
- Port cranes
- Ship unloading cranes
- Cable crane systems
Why Choose NG Attachments?
- Experienced manufacturer: NG Attachments produces heavy-duty grabs, buckets, and crane attachments for international markets.
- Custom engineering: Rope system, shell width, capacity, material thickness, and wear plates can be adjusted according to your project.
- Durable material options: Hardox, ST52, and other high-strength steels are available depending on the application.
- Export-ready production: Products can be packed and prepared for safe international shipment.
- OEM and replacement solutions: Mechanical grabs can be manufactured as replacement units for many crane brands and operating systems.
Request a Quotation
To receive a quotation for a
2-rope or 4-rope mechanical rock grab, please share your crane type, rope system, required capacity, material type, material density, working area, and destination port or country. NG Attachments can provide a suitable technical and commercial proposal according to your application.
Frequently Asked Questions
What is a 2-rope mechanical rock grab?
A 2-rope mechanical rock grab is a crane attachment that uses one rope system for lifting and another rope system for opening and closing the clamshell shells. It is commonly used for bulk materials such as stone, sand, gravel, and scrap.
What is a 4-rope mechanical grab?
A 4-rope mechanical grab is designed for cranes with separate lifting and closing rope systems. It is generally preferred for heavier materials, higher capacities, and intensive port or mining operations.
Can NG manufacture custom mechanical rope grabs?
Yes. NG Attachments can customize mechanical grabs according to crane specifications, material density, capacity requirement, shell design, rope arrangement, and working conditions.
Are mechanical rock grabs hydraulic?
No. Mechanical rock grabs are operated by crane ropes and do not require hydraulic power, electric motors, power packs, or control cables.
Which materials can be handled with mechanical rock grabs?
Mechanical rock grabs are suitable for rock, stone, ore, gravel, aggregates, scrap, heavy waste, and other abrasive bulk materials.
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