From Need to Delivery: Everything You Need to Know to Buy a BTH Device with Dongqi Crane
Introduction: The Critical Nature of Below-the-Hook Lifting
In the world of overhead lifting, there exists an unyielding truth: there is no margin for error. When tons of material swing suspended above a worksite, the difference between a routine operation and a catastrophic failure is measured in millimeters and milliseconds. The slightest miscalculation in any part of an overhead lift can turn an ordinary day into one that results in severe injury or death. This reality is why the industry has developed rigorous standards for safety and equipment, particularly for below-the-hook (BTH) lifting devices.
A below-the-hook lifting device—commonly referred to as a lifter—serves as the critical interface between the hoist and the load. These engineered components attach loads to hoists, coming in forms as varied as the materials they handle: structural and mechanical lifters, vacuum devices, lifting magnets, scrap and material-handling grapples, and clamps. Each variation addresses specific lifting challenges, from coils of steel to sheets of glass, from palletized goods to irregularly shaped machinery.
At Dongqi Crane, we understand that your lifting needs extend beyond the crane itself. As a Sino-New Zealand joint venture with advanced European technology research and development, we are committed to providing comprehensive lifting solutions that address every aspect of your material handling requirements . When you need a below-the-hook device engineered specifically for your application, our expert technical team stands ready to deliver prompt and comprehensive support for all your lifting initiatives .
This comprehensive guide walks through the entire procurement process—from initial need recognition to final delivery—covering standards compliance, ordering procedures, lead time expectations, repair protocols, and the compelling reasons to partner with Dongqi Crane for your below-the-hook lifting solutions.
Part I: Understanding the Standards Governing BTH Devices
The ASME Framework: B30.20 and BTH-1
Before diving into the procurement process, one must understand the regulatory landscape that governs below-the-hook devices. The American Society of Mechanical Engineers (ASME) has established two primary standards that every compliant BTH device must meet: ASME B30.20 and ASME BTH-1.
ASME B30.20: Below-the-Hook Lifting Devices represents the safety standard for these critical components. This volume of the overarching ASME B30 standard focuses specifically on below-the-hook devices, outlining requirements for marking, construction, installation, inspection, testing, maintenance, and operation.
While B30.20 addresses the “what” of compliance—the requirements devices must meet—ASME BTH-1: Design of Below-the-Hook Lifting Devices delves into the “how.” This standard digs deeper into the engineering side, specifying safety factors, design categories, and service classes. It provides the minute details of what each lifter needs to satisfy requirements from an engineering perspective.
At Dongqi Crane, our commitment to quality begins with comprehensive certifications. We have passed ISO9001 international quality system certification, ISO14004 environment management system certification, and OHSAS18001 occupational health and safety certification, which comprehensively promotes our overall management level . Our cranes meet global standards like ISO and CE, ensuring compliance with regional and industry-specific regulations . This same commitment extends to every below-the-hook device we design and manufacture.
Scope of Coverage
ASME B30.20 specifically addresses six types of below-the-hook lifting devices:
- Structural and mechanical lifting devices: Constructed of rigid parts that move in tandem to secure loads
- Vacuum lifting devices: Using electric-powered pumps and sealed pads to create suction for attachment
- Close proximity operated lifting magnets: Magnets controlled by operators working nearby
- Remotely operated lifting magnets: Magnets controlled from a distance
- Scrap and material-handling grapples: Designed for loose or irregular materials
- Clamps: Including those used for positioning and anchoring
The standard applies to clamps used for positioning and anchoring as well, recognizing that these devices serve critical functions beyond simple lifting.
Part II: The Dongqi Advantage for Custom BTH Solutions
Why Choose Dongqi Crane for Your Below-the-Hook Needs
When conducting overhead lifts, bringing your needs to a company that designs, manufactures, and distributes below-the-hook devices on a daily basis offers peace of mind. Dongqi Crane brings over 20 years of technical experience to every project, with a professional team dedicated to providing good service and high-quality lifting solutions .
Our company employs more than 3,600 professionals, including 500 technical specialists and over 70 senior engineers . This depth of technical knowledge provides the expertise necessary for complex lifting systems and distinguishes Dongqi Crane from conventional manufacturers. We can create custom solutions that address unique industrial challenges, whether you need specialized lifting attachments for delicate glass panels or heavy-duty solutions for steel mill applications .
Engineering Capabilities
Dongqi Crane is undaunted by challenges in meeting any of your special lifting requirements. With our research and development laboratory, 70 senior engineers, and 500 technicians, we are capable of solving your lifting problems . You need not be a crane expert—Dongqi can do everything for you.
Our engineering team possesses strong capabilities in custom design, able to provide tailored solutions based on your specific plant layout, process flow, and peak capacity needs. Whether it involves a special span, lifting height, or protective design for high-temperature or corrosive environments, we can deliver .
What sets Dongqi apart is our commitment to European technology integration. We collaborate with renowned European machinery manufacturers, including Britain’s SZW, Germany’s NORD and SIEMENS, and France’s Schneider Electric . These partnerships ensure that every below-the-hook device we produce incorporates state-of-the-art technology and meets rigorous European specifications.
Part III: The Journey from Need to Order with Dongqi
Initial Consultation: Understanding Your Application
The procurement process at Dongqi Crane begins with recognition that standard rigging solutions may be insufficient for your particular application. Safety and efficiency drive most decisions to invest in custom below-the-hook equipment. Sometimes, using traditional wire rope slings, alloy chain slings, or synthetic slings simply cannot safely and securely move a load from one location to another.
When you contact Dongqi with your project details—lifting capacity, application requirements, and specific challenges—our team provides a customized consultation within 24 hours . We value each of your inquiries or consultations. Dongqi has its own service center where any of your consultations or problems will be handled without delay .
Once you choose to work with us, you will be assigned an experienced engineer who takes full responsibility for handling all your needs, fully supported by the entire Dongqi organization. What we focus on is not just making a sale but providing an optimal material handling solution for you .
The Engineering Review Process
After understanding your needs and conducting technical discussions among Dongqi engineers, we provide CAD-generated clearance drawings for your initial approval. These detailed approval drawings show critical dimensions and measurements specific to your application.
This review step is crucial. It ensures that you will receive a device that meets your needs for safe lifts and verifies that the design and measurements will work in your actual application. You have the opportunity to confirm that the design aligns with your operational requirements. Revisions are made if necessary to ensure the correctness of dimensions and details .
Only after you sign off on the approval drawings and provide confirmation does the manufacturing process begin.
Customization Options
Dongqi Crane specializes in tailored designs for below-the-hook devices. We adjust lifting capacity, dimensions, and features to match your project requirements . Our customization capabilities include:
- Capacity and dimensions: Adjustable load capacities, spans, and lifting heights based on your specific needs
- Material selection: Options for various materials based on your application requirements
- Environmental adaptations: Weather-resistant coatings and sealed components for outdoor or harsh environments
- Control systems: Manual or electric controls, with optional wireless remote operation for enhanced flexibility
Part IV: Manufacturing and Lead Time Considerations
The Dongqi Production Facility
Dongqi Crane’s manufacturing facility is located in Changyuan, known as the “Cradleland of Cranes” in China’s Henan Province . This 240,000 square meter facility represents one of the most advanced crane production complexes in Asia, housing over 2,000 sets of sophisticated manufacturing and detection equipment .
With total investment reaching 240 million RMB and registered capital standing at 108 million RMB, our state-of-the-art infrastructure enables Dongqi Crane to maintain its position among elite lifting equipment manufacturers worldwide . Our annual comprehensive production capacity exceeds 10,000 crane sets, with output values reaching 1.5 billion RMB .
Factors Affecting Lead Time
Lead time for custom below-the-hook devices varies significantly based on project complexity. Understanding these variables helps customers plan effectively and set realistic expectations.
For standard product offerings—those that are not complex builds requiring extensive machining and secondary processes—manufacturing typically requires six to ten weeks from approval to delivery. These projects benefit from established designs and streamlined production processes.
However, larger, more complex devices require substantially more time. Heavy industrial items may need ten to twenty-four weeks for completion. These devices require fabrication, outside machining, and various secondary processes before they are ready for delivery.
Throughout the production process, a Dongqi engineer serves as the conductor and supervisor . This ensures that every detail of the design is faithfully executed and that quality standards are maintained at every step.
Advanced Manufacturing Technologies
Dongqi employs advanced manufacturing technologies to ensure precision consistently:
- Computer-aided design (CAD) software: Optimizes structural designs before fabrication begins
- Finite element analysis (FEA): Validates load distributions and identifies potential stress concentrations effectively
- Automated welding systems: Deliver uniform weld quality exceeding AWS D1.1 standards
- CNC machining centers: Produce components to tight tolerances essential for smooth operation
These technologies ensure that every below-the-hook device we produce delivers extended service life and reliable performance .
Part V: Applications and Industry Solutions
Serving Diverse Industries
Dongqi Crane’s below-the-hook devices serve a wide range of industries, including steel, electric power, petrochemical engineering, mechanical manufacture, military projects, warehouse and logistics, paper manufacture, and vehicle manufacture . Our products operate in over 80 countries across Southeast Asia, Eastern Europe, the Middle East, Africa, the Americas, and Oceania .
Specialized Solutions for Metal Processing
The metal processing industry presents unique challenges for below-the-hook lifting. From heavy steel plates and standard structurals to mountains of metal scrap, material diversity demands adaptable lifting solutions.
Dongqi’s engineering expertise shines in applications requiring multiple handling capabilities. Our dual-purpose crane solutions, for example, integrate both electromagnetic and hydraulic grab functions into a single system . The electromagnet unit optimizes handling of finished and regular materials like steel plates, while the hydraulic grab unit handles bulk materials such as metal scrap, chips, and ores.
The revolutionary quick-change system serves as the “intelligent hub” of this solution. Through an engineered quick-connection interface, operators can safely and simply switch attachments within minutes, compressing hours of production setup time into minimal downtime .
Case Studies: Real-World Success
A Major Steel Complex in Pakistan: Facing dual pressures of scrap processing and finished plate dispatch, this facility introduced Dongqi below-the-hook solutions to unify logistics management. The rapid attachment switching capability increased logistics efficiency by over 35%, and the space saved was used to expand raw material storage area, directly enhancing the plant’s throughput capacity .
A Heavy Machinery Manufacturer in Poland: During manufacturing of large structural parts, the need arose to frequently alternate between lifting large steel plates and handling heavy scrap. Dongqi’s solution, with precise positioning and quick-change capability, perfectly matched their lean production tempo, increasing productivity by approximately 25% while significantly enhancing workplace safety .
KBK Light Crane System Integration
For applications requiring modular and flexible below-the-hook solutions, Dongqi’s KBK light crane system offers exceptional adaptability. This versatile family of flexible beam cranes, originating from European engineering standards, integrates suspensions, rails, trolleys, electric hoists, and control units into seamless aerial transport solutions .
The KBK system shines in environments requiring precise and adaptable lifting, such as industrial workshops streamlining assembly lines, warehouses facilitating efficient goods movement, and factories enhancing productivity in mechanical processing . Its modular nature allows for quick adaptation to evolving production demands, making it an ideal choice for modern manufacturing facilities.
Part VI: What Happens When Damage Occurs
Immediate Response Protocols
Despite best efforts in design and manufacturing, below-the-hook devices may eventually sustain damage during service. When this occurs, immediate action is required. Dongqi Crane urges customers to contact us right away if damage happens.
At Dongqi, customer service is our priority. We provide 24/7 after-sales service, including technical support, maintenance, and repairs. Our dedicated technical team swiftly resolves issues and is available for necessary on-site service to ensure project efficiency .
When a damaged device is returned to us, we conduct a thorough investigation to understand what caused the failure. This analysis considers multiple factors:
- Product misuse: Was the device used in ways not intended by the design?
- Manufacturing flaws: Did any defect contribute to the failure?
- Application misunderstanding: Was the device poorly matched to the application?
- Unforeseen forces: Did the device encounter loads or conditions not considered during design?
For devices that have been in service for years before failing, we bring the unit back to our facility, inspect the entire lifter, repair it if possible, and return it to service.
The Critical Warning: No Field Repairs
One of the most important warnings from industry experts is this: DO NOT work on or repair below-the-hook lifting devices in the field. Attempting field repairs can have serious consequences, including voiding the manufacturer’s warranty and shifting liability to your company in case of failure.
The reasons for this prohibition are rooted in engineering reality. Proper repairs require knowledge of the original design specifications, access to appropriate materials, understanding of weld procedures, and verification that repairs meet ASME standards. Field repairs cannot guarantee these requirements are met.
Dongqi’s Repair and Recertification Services
For customers needing repair services, Dongqi offers comprehensive reconditioning. Our after-sales service department stands ready to handle your repair needs with the same expertise applied to new equipment .
When devices require recertification, our engineers can perform detailed analysis, including Finite Element Analysis (FEA) when necessary. We evaluate the device’s condition and determine appropriate repair strategies that maintain compliance with applicable standards.
The Importance of Original Documentation
Maintaining proper documentation throughout your device’s service life is essential. If you ever need repair or recertification services, having original documentation streamlines the process significantly.
When customers seek certification for existing devices without original documentation, challenges arise. Reverse engineering cannot confirm critical details such as correct weld rod usage or proper weld processes, nor can it determine how many load cycles the lifter has experienced.
Dongqi addresses this by working closely with customers who need documentation for older equipment. On a case-by-case basis, if customers can supply all manufacturing information, we may proceed with evaluation and testing to establish safe working load ratings.
Part VII: The Value of Partnering with Dongqi Crane
Regulatory Compliance and Liability Protection
Perhaps the most compelling reason to engage Dongqi Crane for below-the-hook devices involves regulatory compliance and liability protection. If an accident occurs that draws OSHA scrutiny, inspectors will examine every detail to ensure the device meets standard requirements.
When you purchase from Dongqi, your device arrives with comprehensive documentation:
- Tagging and markings: Meeting all applicable standard requirements
- Engineering documentation: Demonstrating compliance with design standards
- Load test certification: Verifying capacity through actual testing
- Warning markings: Clearly indicating safe use parameters
This documentation serves as your defense in case of incidents and your proof of compliance during inspections.
Professional Engineering and Standards Participation
Dongqi employs engineers with deep expertise in lifting equipment design. Our technical team handles customized crane design, installation, repair, and retrofitting, offering prompt and comprehensive support for all lifting initiatives .
We maintain active awareness of evolving standards through our participation in the industry and our partnerships with European technology leaders. This ensures that every device we produce meets current requirements and incorporates best practices from global markets.
Comprehensive Service Commitment
Dongqi’s service philosophy extends well beyond the initial sale. We provide:
- 24/7 responsive after-sales support: Keeping your equipment running smoothly
- Free consultation: Available whenever you have questions
- Problem-solving assistance: Our team addresses issues promptly
- Preventive maintenance guidance: Helping you extend equipment lifespan
- On-site service when needed: For complex situations requiring direct intervention
A Dongqi engineer stays with you until your equipment is up and running, and we continue providing professional advice and service throughout the working life of your device .
Global Project Execution
From Pakistan to Poland, from the United States to Australia, Dongqi has established an effective international service model. We manage the complete chain from technical clarification and custom design through international logistics to on-site installation supervision, ensuring projects are delivered on time and to specification .
Our experienced export departments handle documentation, logistics, and customs clearance efficiently. Multilingual technical support teams provide comprehensive assistance in English, Spanish, Russian, French, and Arabic, ensuring clear communication throughout project lifecycles .
Long-Term Value
When you choose Dongqi for your below-the-hook lifting needs, you invest in long-term value. Our devices feature:
- Durability: The durability of Dongqi products can be felt when you see them, with one-year guarantee and five-to-ten-year warranty available accordingly
- Cost effectiveness: Technology innovation reduces production costs while improving product quality
- Reduced maintenance: Quality components need less maintenance, reducing your maintenance costs
- Low downtime: Reliable operation improves working efficiency and reduces long-term costs
Your selection of Dongqi represents a chance for mutual success .
Part VIII: Types of Below-the-Hook Devices from Dongqi
Understanding the range of available devices helps purchasers make informed decisions. Below-the-hook attachments come in numerous configurations designed for specific applications.
Lifting Beams and Spreader Beams
Lifting beams consist of a beam suspended from a hoist and crane, providing multiple load lifting points to improve load security and control. Dongqi can engineer these for specific span requirements and load configurations.
C-Hooks for Coil Handling
Designed specifically for coil handling, C-hooks connect to coils of material for lifting and transport. The hook inserts into the coil’s inner diameter, and integrated motors can power hook rotation for additional load control.
Gripping Lifters
Using either friction or pressure to hold loads, gripping lifters include tong grabs, coil grabs, and clamps. Their design generates scissor-type action to grip loads securely.
Vacuum Lifters and Magnets
Vacuum lifters utilize electric-powered extraction pumps and sealed pads to create suction for attachment. Magnets—either with or without electrical power supply—lift, carry, or release flat or round ferrous objects.
Our electromagnet units feature powerful magnetic force and precise control systems ensuring safe and efficient handling, with built-in battery backup systems providing ultimate safety assurance .
Grapples for Bulk Materials
Hydraulic grab units are born to handle bulk materials. Designed for metal scrap, chips, and ores, their reinforced structure and optimized grab curve ensure high fill rates and low residue, significantly boosting the efficiency of scrap processing workflows .
Specialized Devices
Other device types address specific needs:
- Sheet lifters: Using claws that wrap around sheet edges with integrated lips preventing fallout
- Pallet lifters: Incorporating forks to lift unitized loads from underneath
- Drum handlers: Gripping and turning drums for filling and emptying
- Custom-engineered solutions: For unique applications requiring innovative approaches
Part IX: Receiving and Putting Your Device into Service
Initial Inspection
When your new below-the-hook device arrives from Dongqi, conduct a thorough initial inspection before placing it into service. Verify that all required tagging and markings are present, confirming compliance with applicable standards. Review the documentation package, ensuring you have approval drawings, engineering designs, and inspection reports for your records.
Pre-Use Inspection Protocols
As with all overhead handling systems, operators should inspect below-the-hook attachments prior to lifting the first load each day. This includes verifying that all attachment clamps or brackets are in place and properly functioning and confirming that no damage has occurred during storage or between uses.
Dongqi provides maintenance guides and offers inspection and preventive maintenance services to extend equipment lifespan .
Operator Training
While you need not become a crane expert yourself, ensuring your operators understand proper use of below-the-hook devices is essential. Dongqi can provide guidance on operator training or connect you with resources for comprehensive instruction.
Maintenance Best Practices
To ensure long-term performance of your below-the-hook device, follow these maintenance guidelines:
- Regular inspections: Check for wear, deformation, or damage
- Proper lubrication: Maintain moving parts according to manufacturer recommendations
- Load testing: Conduct periodic testing to verify continued capacity
- Documentation retention: Maintain all records throughout the device’s service life
With proper care, Dongqi cranes and below-the-hook devices can last decades. Lifespan varies based on usage and maintenance, and we offer tailored plans to maximize durability .
Conclusion: The Dongqi Difference
The journey from need to delivery for a below-the-hook lifting device involves numerous steps, each critical to ensuring safe, efficient lifting operations. Understanding standards, navigating the ordering process, anticipating lead times, and knowing how to handle repairs all contribute to successful outcomes.
At Dongqi Crane, we bring over two decades of experience, advanced European technology integration, comprehensive engineering capabilities, and unwavering commitment to quality to every project. Our team of 500 technical specialists and 70 senior engineers stands ready to address your most challenging lifting requirements . We deliver devices that meet international standards, backed by professional engineers and thorough documentation.
When loads hang in the balance—sometimes literally—the peace of mind that comes from expertly engineered and fabricated equipment is invaluable. The investment in proper procurement processes pays dividends in safety, compliance, and operational efficiency for the life of the equipment.
As you evaluate your lifting needs and consider custom below-the-hook solutions, remember that the goal extends beyond simply moving materials from point A to point B. True success means doing so safely, efficiently, and with complete confidence that your equipment will perform as designed every time it is called upon.
With Dongqi Crane as your partner, that level of performance is achievable. Our corporate vision is to become a leading crane industry enterprise all over the world, and our mission is to focus on customer needs, provide competitive crane solutions and services, and continue to create value for customers .
Begin your customized productivity upgrade journey today. Contact Dongqi Crane with your project details—lifting capacity, application requirements, material types, daily handling volume, plant layout diagram, or required span and lifting height. Based on this information, our engineering team will prepare a preliminary solution concept and value assessment, visually demonstrating the potential for productivity gains and return on investment.
Let Dongqi Crane transform your material handling operations from a cost center into a strategic advantage for global competitiveness.
