High-Current Crown, Torsion, and Wire Springs for EV Charging Guns — 6.0 10 12 14 16 mm
High-Current Crown, Torsion, and Wire Springs for EV Charging Guns — 6.0 10 12 14 16 mm

Engineering the Current: How Ansix Tech is Redefining High-Current Crown, Torsion, and Wire Springs for EV Charging Guns
The global electric vehicle (EV) market is accelerating at an unprecedented pace, and with it, the demand for charging infrastructure that can deliver higher power levels with absolute reliability. In 2024, the global market for passenger car DC charging guns reached approximately $512 million, with projections indicating growth to $1.187 billion by 2031—a compound annual growth rate of 12.9% . As charging technology pushes into ultra-high power territories exceeding 600 amps, the components that ensure safe, efficient current transfer have come under intense scrutiny .
At the heart of this evolution lies a critical yet often overlooked component family: high-current crown springs, torsion springs, and wire springs for EV charging guns. These precision components—manufactured in standardized diameters of 6.0, 10, 12, 14, and 16 mm—serve as the essential interface between the charging gun and vehicle inlet, ensuring consistent electrical contact, mechanical durability, and thermal management under extreme operating conditions.
Ansix Tech, a company with over 28 years of manufacturing expertise in precision injection molding and mold engineering, has strategically positioned itself at the forefront of this specialized market. Through a holistic approach encompassing design, development, manufacturing, and rigorous quality validation, Ansix Tech has transformed what were once considered commodity components into engineered solutions that deliver exceptional reliability and demonstrable cost savings for EV charging manufacturers worldwide.
Project Initiation: Engineering the Foundation for High-Current Components
The journey toward manufacturing high-current crown, torsion, and wire springs begins not on the production floor, but in the collaborative space between Ansix Tech’s engineers and their clients. The company operates on a principle of concurrent engineering, where manufacturing experts engage with design teams from a project’s inception to optimize every aspect of component geometry for the injection molding process .
For the specific size variants of 6.0, 10, 12, 14, and 16 mm, the initiation phase involves a comprehensive assessment of application requirements. These springs function within the charging gun’s electrical contact system, where they must maintain consistent pressure against mating surfaces while accommodating thermal expansion, vibration, and thousands of mating cycles over the product’s service life. Each diameter corresponds to specific current-carrying requirements and mechanical envelope constraints, demanding precisely tailored design parameters.
Ansix Tech’s project initiation protocol begins with detailed Design for Manufacturability (DFM) analysis. Using advanced simulation software, engineers conduct virtual assessments that identify potential manufacturing pitfalls before any steel is cut for tooling. This proactive approach, which industry experts note can determine up to 70% of a product’s ultimate manufacturing cost during the initial design phases, serves as the foundation for cost-effective production .
The Value Proposition: From Concept to Certified Mass Production
Ansix Tech’s value delivery to clients spans the entire product lifecycle—from prototype design through manufacturing verification to mass production and assembly validation. This comprehensive engagement model ensures that components not only meet technical specifications but also achieve optimal cost structures through systematic engineering.
Prototype Design and Digital Verification
The prototype phase at Ansix Tech leverages both digital and physical validation methodologies. Engineers create detailed 3D models of the spring components and subject them to Mold Flow Analysis using industry-standard software. This simulation process predicts fill patterns, identifies potential weld lines, evaluates cooling uniformity, and anticipates warpage—allowing corrective actions to be implemented digitally .
For high-current spring applications, the simulation focuses on several critical parameters. Fill pattern analysis ensures balanced material flow into the complex geometries of crown springs and torsion coils, preventing air traps that could create structural weaknesses. Cooling simulation identifies hot spots that might lead to differential shrinkage, a particular concern for components that must maintain precise dimensional tolerances to ensure consistent contact pressure. Warpage prediction allows engineers to adjust gate locations, cooling channel layouts, or part geometry to eliminate deformation that could compromise electrical performance .
Where necessary, Ansix Tech employs rapid prototyping using 3D Printing or CNC machining to produce functional prototype parts. These physical samples undergo verification testing—dimensional checks, fit assessments with mating components, and preliminary electrical contact evaluation—providing tangible confirmation before mold manufacturing commences .
Manufacturing Verification and Certification
A prototype that functions in a laboratory environment does not guarantee success on a production line. Ansix Tech addresses this gap through a rigorous Manufacturing Verification Process modeled on automotive industry best practices, structured around stage-gate validation phases .
The verification protocol begins with tooling tryouts using production-intent molds to produce initial samples. These samples undergo dimensional validation using Coordinate Measuring Machines (CMM) and 3D scanning technology to ensure every critical dimension falls within Statistical Process Control (SPC) limits. Environmental and mechanical testing subjects Molded Parts to thermal cycling, humidity exposure, and mechanical stress evaluation—validating that the components can withstand real-world operating conditions.
Only after passing these validation gates does the project receive mass production certification, confirming that Ansix Tech’s manufacturing process can consistently produce compliant parts at the required volumes .
Addressing Critical Challenges: The Engineering Imperative
High-current spring components for EV charging guns present unique engineering challenges that distinguish them from conventional injection-molded parts. These components must simultaneously satisfy demanding electrical, mechanical, and thermal requirements while maintaining cost-effectiveness for mass production.
Electrical Performance and Contact Integrity
The crown, torsion, and wire springs serve as current-carrying elements within the charging interface, requiring exceptional electrical conductivity and consistent contact pressure. The 6.0 mm through 16 mm diameter variants correspond to different current ratings, with larger diameters typically associated with higher power transfer capabilities. Each must maintain stable electrical contact across thousands of mating cycles, withstanding the mechanical wear that accompanies repeated insertion and withdrawal.
Ansix Tech addresses these requirements through precision dimensional control and material selection. The geometry of crown springs—with their characteristic multi-finger contact architecture—demands exacting tolerances to ensure uniform pressure distribution across all contact points. Similarly, torsion springs must maintain consistent torque characteristics throughout their service life, while wire springs require precise coil geometry to deliver predictable force-deflection behavior.
Thermal Management in High-Power Applications
Modern high-power charging systems generate substantial heat that must be effectively managed to prevent performance degradation or component failure. With charging power levels now reaching 600 amps or more, the thermal demands on contact components have escalated dramatically .
The high-current springs function within this thermal environment, where they must maintain mechanical properties and dimensional stability across operating temperatures ranging from -30°C to 120°C. Ansix Tech’s material selection and process optimization strategies directly address these thermal challenges, ensuring that components retain their electrical and mechanical functionality under extreme conditions.
Mechanical Durability and Cycle Life
EV charging guns undergo frequent mating cycles throughout their service life, subjecting internal spring components to repeated mechanical loading. The springs must maintain consistent contact pressure without experiencing permanent set or fatigue failure that could compromise electrical performance.
Ansix Tech’s approach to this challenge encompasses both material selection and processing parameters. The choice of polymer compounds with appropriate mechanical properties, combined with optimized molding conditions that minimize residual stress, produces components capable of withstanding the mechanical demands of real-world charging applications.
Raw Material Selection: The Foundation of Performance
The selection of raw materials for high-current spring components represents a critical decision that influences every aspect of component performance, manufacturability, and cost. Ansix Tech maintains extensive expertise in engineering thermoplastics and their specific grades, allowing informed selection that balances technical requirements with economic considerations .
Material Composition and Performance Characteristics
For high-current spring applications, the material formulation must deliver an exceptional combination of properties that no single base polymer can provide. Ansix Tech’s material strategy typically begins with a base resin selected for its inherent mechanical and thermal characteristics, supplemented with specialized modifiers that address specific performance requirements.
Polyamide (PA) with Glass Fiber Reinforcement: For many high-current spring applications, polyamide 66 with 30% glass fiber reinforcement (PA66 GF30) represents an optimal balance of properties. This material offers high strength and stiffness essential for maintaining contact pressure, inherent flame retardancy meeting UL94 V-0 requirements, high Comparative Tracking Index (CTI) for electrical safety, and good chemical and weather resistance for outdoor durability . The glass fiber reinforcement provides the mechanical rigidity required for spring functions while maintaining dimensional stability across temperature variations.
Polycarbonate (PC) Base Compounds: For applications requiring enhanced toughness or specific electrical properties, polycarbonate-based formulations may be preferred. Siliconized polycarbonate (typically 10-80% of formulation) enhances flow characteristics while maintaining mechanical properties, particularly important for the thin-walled sections common in spring designs. Acrylic-based impact modifiers (5-12%) provide essential low-temperature toughness, preventing brittle failure in freezing conditions—a critical consideration given the outdoor deployment of charging equipment .
Specialized Additives: Advanced formulations may incorporate nano-scale silica particles (4-8%) to improve wear resistance and dimensional stability. Halogen-free flame retardants achieve crucial UL94 V-0 ratings without introducing corrosive combustion products, while specialized stabilizers protect against UV degradation and thermal oxidation throughout the product’s service life .
Material Selection as a Cost-Strategy Tool
Ansix Tech views material selection not merely as a technical decision but as a strategic lever for cost optimization. By thoroughly understanding property requirements, the company can identify opportunities to select more cost-effective grades without compromising performance.
One significant cost-saving strategy involves the strategic use of “wide-spec” resins—materials with slightly broader performance tolerances that are often available at lower cost. While the inherent variability of such materials might challenge conventional molding operations, Ansix Tech’s advanced process control systems, including cavity pressure sensors and scientific molding techniques, actively compensate for material viscosity fluctuations, ensuring consistent part quality despite wider specification bands .
Mold Flow Analysis and Design for Manufacturing
Mold Flow Analysis serves as the digital crucible where potential manufacturing problems are identified and solved before physical tooling begins. For high-current spring components with their complex geometries and demanding performance requirements, this virtual validation is indispensable.
Predicting and Preventing Defects
The simulation process evaluates multiple critical parameters that directly impact part quality and manufacturing efficiency.
Fill Pattern Analysis: Engineers simulate the flow of molten plastic to ensure balanced filling of the mold cavity. For crown springs with their multi-finger geometry, balanced filling is essential to prevent weld lines at critical contact points that could create structural weaknesses. The analysis identifies areas where flow hesitation might cause surface defects or incomplete filling, allowing gate location and runner design to be optimized before mold manufacturing .
Cooling System Simulation: The efficiency of the mold’s cooling system is modeled using thermal property data for the selected mold steel and plastic material. Uniform cooling is critical for preventing warpage and maintaining dimensional stability—particularly important for torsion and wire springs that must maintain precise geometry to deliver consistent force characteristics. The simulation identifies hot spots that would otherwise extend cycle times or create residual stresses .
Warpage Prediction: The software predicts how and where the part will deform as it cools and solidifies. By adjusting cooling channel layouts, gate locations, or part geometry at the digital stage, Ansix Tech can virtually eliminate costly warpage issues that might otherwise surface during production. This predictive capability is especially valuable for long, slender components like wire springs where differential shrinkage could cause unacceptable distortion .
From Simulation to Tooling Strategy
The insights gained from Mold Flow Analysis directly inform the physical mold design, guiding decisions on runner systems, gate configurations, cooling layouts, and ejection mechanisms. This integrated approach ensures that the mold is optimized for the specific material and geometry of each high-current spring variant.
Mold Design Engineering: The Heart of Production Capability
The injection mold for high-current spring components represents a sophisticated mechanical system that must operate with micron-level precision across hundreds of thousands of cycles while withstanding substantial thermal and mechanical stresses . Ansix Tech’s mold design philosophy integrates multiple interdependent systems, each engineered for performance and cost-effectiveness.
Mold Steel Selection
The choice of mold steel directly influences tool life, part quality, and production efficiency. Ansix Tech evaluates the specific requirements of each project to select the optimal alloy .
For high-volume production of spring components, pre-hardened stainless mold steel like STAVAX ESR (AISI 420) is frequently specified. This material offers excellent polishability for achieving the surface finishes required for clean part release, corrosion resistance essential for water channel integrity, and good wear resistance for extended tool life .
For components requiring superior thermal conductivity to reduce cycle times, alloys with high thermal conductivity such as copper-beryllium may be incorporated into specific mold sections. These materials can cool up to ten times faster than standard steel, providing targeted heat extraction where cooling is most critical .
For inserts in high-wear areas such as gate locations, harder steels like S7 or H13 may be selected to withstand the abrasive effects of glass-filled materials over extended production runs .
Cooling System Design
Effective cooling is arguably the most critical factor in both cycle time and part quality. Cooling typically accounts for the largest portion of the injection molding cycle, and uniform heat extraction directly impacts dimensional stability and residual stress levels .
Ansix Tech employs conformal cooling design wherever possible—cooling channels that follow the contour of the mold cavity at a consistent distance. This approach, which can reduce cycle times by up to 30% compared to traditional drilled channels, provides substantially more uniform cooling while improving part quality . For deep core sections such as those forming the interior surfaces of crown spring components, baffle or bubbler systems direct coolant flow effectively .
The cooling system design is informed by thermal simulation data from the Mold Flow Analysis phase, ensuring that channel placement and sizing are optimized for the specific geometry and material of each component variant.
Runner and Gating Systems
The runner and gating system delivers molten plastic from the injection unit to the mold cavity, with design decisions significantly influencing material efficiency, cycle time, and part quality.
For high-current spring components, Ansix Tech frequently employs hot runner systems with valve gates. This approach eliminates material waste from cold runners, allows independent gate control for sequential filling of complex parts, and reduces cycle time by maintaining the plastic in a molten state within the delivery channels .
Gate locations are carefully selected based on Mold Flow Analysis results, positioned to ensure balanced filling while minimizing visible witness marks on cosmetic surfaces. Submarine gates or pinpoint gates are often used for spring components, allowing clean, automatic degating that reduces secondary operations .
Ejection Systems
Demolding—the ejection of finished components from the mold—presents unique challenges for spring components with their complex geometries and delicate features. Ansix Tech designs ejection systems that apply force evenly to prevent distortion or damage .
A combination of ejector pins, sleeves, and blade ejectors is typically employed, strategically positioned on non-critical surfaces such as ribs or thicker sections. For components requiring particularly careful release, stripper plates may be used to ensure even, force-distributed ejection. Multi-stage ejection systems gradually separate components from core pins and cavity details, preventing the concentrated demolding forces that can cause surface damage .
Mold Manufacturing: Precision Workflow and Technical Challenges
Translating digital design into a physical precision tool demands exceptional manufacturing capability. Ansix Tech’s mold manufacturing workflow follows a disciplined sequence that ensures accuracy, durability, and performance .
Manufacturing Workflow
The process begins with steel cutting and rough CNC machining to establish the basic mold geometry. Where required, heat treatment follows to achieve target hardness for optimal wear resistance. Finish CNC machining then achieves final dimensions, with tolerances measured in microns.
For complex details such as the fine features of crown spring contact fingers, Electrical Discharge Machining (EDM) provides the precision necessary for accurate geometry. Precision grinding ensures flatness and parallelism for critical mating surfaces. Manual polishing achieves the surface finishes required for clean part release and aesthetic quality.
Finally, mold assembly integrates all components—cavities, cores, cooling circuits, ejector systems, and actuation mechanisms—followed by tryout to verify functionality .
Technical Challenges in Mold Manufacturing
Creating molds for high-current spring components presents several significant manufacturing challenges that test the limits of precision machining.
The complex, often undercut geometry of spring components demands multi-axis CNC technology and in-process metrology to ensure accurate feature formation. Achieving the high-gloss surface finishes required for clean part release on deep, textured cavities requires expert CNC milling, EDM, and meticulous hand polishing .
For components with conformal cooling channels, fabrication may require advanced techniques such as metal 3D printing (DMLS) or specialized drilling operations. Integration of sliders, lifters, and angled cores for components requiring undercuts demands precise timing and alignment to ensure reliable operation over production life .
Maintaining perfect alignment between core and cavity for fine features throughout the mold’s service life demands exceptional skill in assembly and quality inspection, with verification performed at each stage of the manufacturing process.
Injection Molding Process: Optimization for Efficiency and Quality
Even with perfect mold design, realizing component quality requires precisely controlled injection molding processes. Ansix Tech employs scientific molding principles to establish robust, repeatable processes that deliver consistent quality while minimizing cycle times and material consumption .
Process Parameter Optimization
The optimization begins with material drying to remove moisture that could cause splay marks or reduce mechanical properties—particularly critical for hygroscopic materials like polyamide. Processing parameters are then fine-tuned through systematic methodology.
Melt temperature optimization balances flow characteristics against thermal degradation risk. Injection speed profiling ensures complete cavity filling without excessive shear heating that could damage material properties. Packing pressure adjustment compensates for material shrinkage during solidification, while cooling time determination achieves dimensional stability without unnecessarily extending cycle time .
For high-current spring components, particular attention is paid to managing fiber orientation in glass-filled materials, which can affect both mechanical properties and warpage behavior. Ansix Tech’s process control systems monitor viscosity indices that indicate material consistency, cavity pressure profiles that verify complete filling and packing, and ejection force measurements that signal potential sticking issues before they cause damage .
Cycle Time Reduction
Cycle time reduction represents a primary lever for cost control in injection molding. Up to 80% of the cycle may be cooling time, making cooling system efficiency paramount . Ansix Tech’s conformal cooling designs directly attack this bottleneck, allowing faster demolding while maintaining dimensional stability.
Additional cycle time reductions come from optimized injection speeds that minimize fill time, reduced clamp tonnage that decreases machine actuation time, and automated part handling that eliminates operator-dependent delays. Each second saved in cycle time directly reduces per-part production cost, creating significant savings over high-volume production runs .
Automation and Process Monitoring
Ansix Tech integrates automation throughout production to drive down labor costs and enhance consistency. Automated systems handle part removal, post-processing, and packaging, removing human variability from cycle time and improving labor efficiency .
Advanced process monitoring extends beyond traditional parameters like temperature and pressure. Cavity pressure sensors provide real-time feedback, allowing closed-loop control that compensates for material viscosity variations and other disturbances. This “quality by design” approach prevents the substantial costs associated with rework, scrap, and field failures .
Quality Control and Assurance: Engineering Reliability
Quality control at Ansix Tech is not an isolated final inspection but a thread woven throughout the manufacturing process. The goal is to build quality into the component from the initial design, rather than inspecting for defects after production .
In-Process Quality Monitoring
Statistical Process Control (SPC) monitors critical dimensions during production runs, detecting any process drift before it produces non-conforming parts. First-Article Inspection (FAI) reports are generated for each batch, providing comprehensive verification of all critical dimensions against design specifications .
For high-volume runs, automated vision systems provide 100% inspection for surface defects or gross dimensional errors. Cavity pressure monitoring during each cycle confirms that the process remains within established control limits, providing the ultimate quality check—the ability to determine if a part is good before the mold even opens .
Validation Testing
Beyond dimensional verification, Ansix Tech subjects components to validation testing that confirms performance under application-relevant conditions. Electrical testing verifies contact resistance and insulation properties. Mechanical testing confirms spring force characteristics and durability. Environmental testing—thermal cycling, humidity exposure, and UV resistance—ensures long-term reliability in outdoor charging applications.
Each mold cavity and production batch is fully traceable, allowing rapid identification and containment of any quality issues that might arise.
Cost Reduction Strategies: Engineering Value for Clients
Ansix Tech views cost reduction not as a simple negotiation of price, but as a fundamental engineering discipline. The company’s systematic approach to cost optimization addresses material selection, process efficiency, and operational effectiveness .
Material Optimization
By rigorously simulating and testing material performance, Ansix Tech ensures that selected materials are the most cost-effective options meeting all specifications. This may involve selecting “wide-spec” resins with broader tolerances but lower cost, or optimizing glass fiber content to achieve required mechanical properties without over-engineering with higher-cost materials .
Strategic material sourcing leverages the company’s purchasing volume and supplier relationships to secure competitive pricing on high-performance resins. Bulk purchasing arrangements for common materials like PA66 GF30 further reduce material costs for high-volume programs .
Process Efficiency
Scientific molding and cycle time reduction directly lower per-part costs. A 15% reduction in cycle time translates to significant increases in annual output without additional capital expenditure. Energy efficiency measures, including the use of all-electric injection molding machines where appropriate, reduce energy consumption while lowering operating costs .
Process optimization that increases first-pass yield minimizes scrap and rework costs. By investing in upfront DFM and Mold Flow Analysis, Ansix Tech virtually eliminates costly mold reworks and production downtime that would otherwise drive up total program costs.
Operational Excellence
Integrated manufacturing—from raw material pre-drying through molding, inspection, and packaging under one roof—reduces logistics overhead and handling damage. Automated systems minimize labor costs while improving consistency. Lean manufacturing principles streamline workflow, reduce work-in-progress inventory, and minimize overhead costs associated with manual handling and inspection .
For clients, these cost reduction strategies translate directly to lower total cost of ownership. Ansix Tech’s approach ensures that components meet exacting quality standards while achieving cost structures that support competitive market positioning.
Packaging and Rapid Delivery: Completing the Value Chain
Understanding that a perfect component can be compromised in transit, Ansix Tech has developed robust packaging and logistics protocols that protect product quality while ensuring timely delivery .
Protective Packaging
For high-current spring components with delicate contact surfaces, packaging must prevent scratching, deformation, or contamination. Ansix Tech designs custom compartmentalized foam inserts within reusable plastic totes, protecting components during transport. Anti-static materials are employed where static-sensitive applications demand them.
Packaging inspections ensure components are free of dust and moisture before sealing. Proper labeling with batch and cavity identification supports traceability throughout the supply chain.
Rapid Delivery Capability
Ansix Tech leverages its integrated supply chain to deliver certified components on demanding schedules. A dedicated project management team ensures seamless communication, often delivering parts from approved mold to customer dock in compressed timeframes for urgent requirements .
The company’s logistics network is configured for rapid delivery, with established partnerships with freight forwarders and carriers. For international shipments, customs clearance processes are streamlined to minimize transit delays. The result is a supply chain capable of supporting just-in-time manufacturing requirements while maintaining product quality.
Strategic Market Positioning: Meeting Evolving Industry Demands
Ansix Tech’s 28 years of manufacturing expertise in precision injection molding provides a foundation for understanding and anticipating market requirements. The company’s strategic positioning in the high-current spring market reflects deep knowledge of EV charging industry dynamics .
Standards Compliance
High-current spring components for EV charging guns must meet stringent international standards that govern safety, performance, and reliability. Ansix Tech designs and manufactures components to satisfy requirements including IEC 62196 for conductive charging of electric vehicles, UL 2251 for plugs and connectors, and IP ratings for dust and water ingress protection .
Specific flame retardancy requirements such as UL94 V-0 are achieved through material selection and formulation. High CTI (Comparative Tracking Index) values essential for electrical safety at high voltages are verified through testing.
Technology Roadmap Alignment
As EV charging technology continues its rapid evolution, Ansix Tech maintains capability to support next-generation requirements. Liquid-cooled charging guns—essential for ultra-high-power applications—present new challenges for component materials and design. Future developments toward megawatt-capable charging systems will demand even greater thermal management and electrical performance .
Ansix Tech’s investment in advanced simulation, material science, and process control positions the company to support these emerging requirements, providing clients with a manufacturing partner capable of evolving alongside the market.
Conclusion: Engineering Reliability and Value
The manufacturing of high-current crown, torsion, and wire springs for EV charging guns represents a specialized discipline where engineering precision directly impacts product performance, safety, and cost. Ansix Tech’s comprehensive approach—encompassing design, material selection, mold engineering, process optimization, and quality assurance—delivers components that meet the exacting demands of modern EV charging systems.
For clients across the EV charging industry, Ansix Tech provides more than component supply; it offers a solutions partnership that de-risks product development, accelerates time-to-market, and delivers components manufactured at cost points that support commercial competitiveness. The company’s 28 years of manufacturing expertise, combined with a systematic approach to cost reduction through material, process, and operational optimization, creates tangible value that extends to the final product.
As the EV market continues its growth trajectory, with charging infrastructure expanding to support millions of vehicles worldwide, the demand for reliable, cost-effective high-current components will only intensify. Ansix Tech’s strategic focus on engineering excellence, quality validation, and continuous improvement positions the company to meet this demand—delivering the current-carrying components that power the electric mobility revolution.
About Ansix Tech
With over 28 years of manufacturing expertise in precision injection molding and mold engineering, Ansix Tech specializes in the design and manufacturing of high-current crown springs, torsion springs, and wire springs for EV charging guns. The company serves clients across the global EV charging industry, offering comprehensive capabilities from prototype design through mass production, supported by rigorous quality validation processes and a commitment to cost-effective manufacturing solutions.




Ansix Tech Co Ltd
If you have any plans related to High-Current Crown, Torsion, and Wire Springs for EV Charging Guns — 6.0 10 12 14 16 mm , you can contact us at any time. We will turn your ideas into reality, let you realize your dreams, and obtain large orders from the market. Our contact information is info@ansixtech.com. Or contact our CTO, mail: stephen@ansixtech.com
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