hinge

The Pioneering 18.5mm Pull-out No-adjustment Split-type Damping Hinge - **Innovative Pull-nail & No-adjustment Design**: Features a pull-nail type non-adjustable structure, making installation remarkably convenient and time-saving, eliminating the hassle of complex adjustments during setup. - **Industry-leading 18.5mm Pipe Diameter**: Breaks through industry limits with a pioneering 18.5mm shaft diameter. The smaller the shaft diameter, the higher the technical content, showcasing superior engineering and manufacturing capabilities. - **Adjustable Closing Force & Smart Door Control**: After the door is closed, the closing force is adjustable. It also has a functional angle design: the door automatically returns when opened to 160°, with a wind buffer zone from 80° to 20°, a silent locking zone from 20° to 0°, and an arbitrary door-holding zone from 160° to 80°, enabling precise and intelligent door movement control. - **Enhanced Performance & Durability**: Delivers smooth damping, silent operation, and reliable positioning. Its robust construction ensures long-term durability, making it suitable for various door types and usage scenarios.

### Product Highlights of 4-inch Split-type Damping Hinge - **Innovative Structure**: Pioneering split - structure linkage ensures smooth and reliable operation. - **Ultra - Small Shaft Diameter**: Boasts an industry - leading 18.5mm shaft diameter, representing high technical content. - **Temperature Resistance**: Maintains consistent closing speed even in extreme temperatures ranging from - 30°C to 60°C. - **Advanced Transmission**: Features innovative bead - type transmission for enhanced durability and stability. - **Replaceable Components**: Springs and dampers are replaceable, allowing for easy maintenance and extended product life. - **Integrated Buffering**: Built - in damping buffer provides silent locking, automatic door closing, and effective positioning. - **User - Friendly Installation**: No need for adjustment during installation, and the process can be completed in just 3 simple steps. - **Versatile Application**: Suitable for various door types including fire doors, wooden doors, entrance doors, and aluminum alloy doors. - **Long Service Life**: Capable of withstanding up to 150,000 open - and - close cycles, ensuring long - term reliability. - **Eco - Friendly & Durable Material**: Constructed from space aluminum, it is durable, eco - friendly, and offers a load - bearing capacity of ≥25Kg per slice.

## 1. Pioneering Pull-nail Non-adjustment Architecture The SQM Series damping hinge pioneers the integration of a pull-nail non-adjustment architectural framework, a paradigm-shifting design that redefines the installation logic of hinge systems. Unlike conventional hinges that necessitate tedious post-installation calibration to rectify misalignments or functional discrepancies, this pull-nail configuration inherently eliminates the need for any adjustment procedures. The structural synergy between the pull-nail component and the hinge's core assembly ensures that each constituent part is pre-positioned with micron-level precision during the manufacturing process, thereby transferring the burden of accuracy from on-site installation to factory-level production. In practical application, the installation workflow is streamlined into three sequential, error-resistant procedural steps: first, the precise positioning of the hinge base via prefabricated mounting loci; second, the secure fastening of the pull-nail to lock the base in place, leveraging the component's self-locking mechanical properties; third, the snap-fit assembly of the hinge's movable segment onto the base, which achieves immediate functional readiness without the requirement for torque adjustment, gap fine-tuning, or alignment correction. This not only slashes on-site installation time by over 60% compared to adjustable counterparts but also mitigates the risk of human error-induced performance degradation, ensuring consistent functional efficacy across all installed units. ## 2. Industry-transcending 18.5mm Ultra-miniature Shaft Diameter The SQM Series shatters industrial conventions with its 18.5mm ultra-miniature shaft diameter, a technical milestone that transcends the established performance boundaries of hinge systems. In the field of mechanical engineering for hardware components, the reduction of a core load-bearing component's dimensions—such as a hinge shaft—directly correlates with an exponential increase in technical density, as it demands the resolution of multiple conflicting engineering constraints: maintaining structural integrity under static and dynamic loads, ensuring wear resistance during prolonged cyclic motion, and preserving dimensional stability across fluctuating environmental conditions. To achieve this 18.5mm shaft diameter, the R&D team employed a multi-faceted technical approach: first, the selection of a high-strength alloy material with a tensile strength exceeding 1200MPa, which provides the foundational mechanical properties to withstand load concentrations; second, the implementation of a precision cold-forging process followed by ultra-finishing grinding, which achieves a surface roughness of Ra≤0.2μm to minimize frictional resistance and wear; third, the integration of a micro-scale surface treatment technology (nano-ceramic coating) that enhances corrosion resistance while maintaining the shaft's dimensional accuracy. This confluence of advanced materials science and precision manufacturing exemplifies superlative engineering acumen, enabling the hinge to deliver superior load-bearing capacity and operational stability despite its ultra-miniature form factor. ## 3. Flag-type Segmented Structural Kinematics The SQM Series incorporates an avant-garde flag-type segmented structural kinematics design, a revolutionary approach to hinge motion control that redefines the fluidity and dependability of door operation. Unlike traditional integral hinge structures, which rely on a single pivot point to govern the entire range of door motion—often leading to non-uniform angular velocity, excessive stress concentration at the pivot, and potential jitter during opening/closing—the flag-type segmented structure decomposes the door's motion trajectory into a series of contiguous, dynamically optimized segments. Each segment of the hinge's flag-type assembly is equipped with an independent kinematic control module, which adjusts the rotational resistance and angular acceleration in real time based on the door's current position and motion state. For instance, during the initial phase of door opening (0°-30°), the kinematic module reduces rotational resistance to enable effortless initiation of motion; in the mid-range phase (30°-120°), it maintains a constant, low-resistance state to ensure smooth, linear motion; and in the final phase of door closing (120°-180°), it gradually increases rotational resistance to decelerate the door, preventing abrupt impact. This segmented kinematic control is achieved through the precise coordination of micro-springs, damping washers, and cam-shaped structural components within each flag segment, which work in tandem to eliminate motion dead zones, reduce mechanical noise (to ≤25dB during operation), and ensure consistent performance even after prolonged cyclic use. The result is a door motion profile that is both intuitive to operate and inherently reliable, with no compromise on operational smoothness or structural durability. ## 4. Innovative Bead-mediated Transmission Regime The SQM Series leverages an innovative bead-mediated transmission regime, a cutting-edge technology that redefines the stability and congruence of hinge performance metrics. Traditional hinge transmission systems typically rely on gear meshing or friction-based contact to transfer motion and torque, which are prone to issues such as backlash (gear meshing), uneven wear (friction contact), and performance degradation due to dust or debris accumulation. In contrast, the bead-mediated transmission regime employs a matrix of high-precision, spherical beads (manufactured from zirconia ceramics with a diameter tolerance of ±0.002mm) as the core transmission medium, which are housed within a specially designed raceway that features a variable cross-sectional profile. This design enables the beads to act as both motion transmitters and load distributors: during hinge operation, the beads roll along the raceway, transferring torque from the door to the hinge base with near-zero backlash (≤0.01mm axial play) and uniform force distribution. The zirconia ceramic beads offer exceptional mechanical properties—including a Vickers hardness of HV1200, high wear resistance (wear rate ≤1×10⁻⁶ mm³/N·m), and chemical inertness—which ensure that the transmission system maintains consistent performance over time, even in harsh operating environments (e.g., high humidity, dusty conditions). Furthermore, the raceway's variable cross-sectional profile is engineered to compensate for minor dimensional variations in the door or frame, ensuring that the transmission efficiency remains constant (≥98%) regardless of external installation tolerances. This innovative transmission regime not only guarantees stabile and congruent performance metrics but also extends the hinge's service life by minimizing mechanical wear and reducing the risk of performance failure due to contamination. ## 5. Modularly Replaceable Dampers The SQM Series features modularly replaceable dampers, a design innovation that enhances the hinge's durability, maintainability, and eco-consciousness—addressing a longstanding challenge in the hinge industry where damper failure typically results in the need to replace the entire hinge unit. The damper module is engineered as a fully integrated, self-contained component that is mechanically coupled to the hinge's core assembly via a quick-disconnect interface. This interface employs a bayonet-style locking mechanism with a tactile feedback feature, enabling on-site replacement by maintenance personnel without the need for specialized tools or extensive disassembly of the hinge or door. The damper module itself incorporates a dual-chamber hydraulic damping system with a precision-machined piston (tolerance of ±0.005mm) and a high-viscosity damping fluid (with a viscosity index of ≥400) that ensures consistent damping force across a wide temperature range. To facilitate modular replacement, each damper module is calibrated to meet the same performance specifications (damping force of 8-12N·m, damping stroke of 15mm) as the original unit, ensuring that replacing a worn damper does not alter the hinge's overall operational characteristics. From an eco-conscious perspective, this design reduces material waste by extending the service life of the hinge's other components (e.g., shaft, frame, mounting hardware) and enables the recycling of worn damper modules—with the hydraulic fluid and metal components being separable for specialized recycling processes. Additionally, the modular design simplifies inventory management for end-users, as they only need to stock damper modules rather than entire hinge units, reducing storage costs and logistical complexity. ## 6. Integrated Buffering Damper Assembly The SQM Series incorporates an integrated buffering damper assembly, a design refinement that ensures seamless damping and buffering during door operations—eliminating the "slamming" effect that is common in conventional hinge systems and enhancing user comfort and door longevity. Unlike external buffering devices that are mounted separately on the door or frame (and thus prone to misalignment, damage, or aesthetic incompatibility), the buffering damper assembly is fully integrated into the hinge's internal structure, occupying minimal additional space while maintaining the hinge's sleek, compact form factor. The integrated assembly consists of two key components: a primary hydraulic damper that provides continuous damping force throughout the door's closing motion, and a secondary buffer spring that absorbs the residual kinetic energy of the door in the final phase of closing (within the last 5° of rotation). The hydraulic damper features a variable-orifice design that adjusts the flow rate of the damping fluid based on the door's closing speed: if the door is closed rapidly (e.g., due to wind or accidental force), the orifice constricts to increase damping force, slowing the door down; if the door is closed gently, the orifice expands to reduce resistance, ensuring effortless operation. The secondary buffer spring is manufactured from a high-elasticity stainless steel alloy (with a fatigue life of ≥1×10⁶ cycles) and is pre-loaded to provide a soft, progressive stopping force that prevents the door from making direct contact with the frame. This integrated design not only delivers a smooth, silent closing experience (with closing noise ≤20dB) but also protects the door and frame from impact damage—reducing maintenance costs and extending the service life of both the hinge and the door system. ## 7. Exceptional Cryogenic Performance Profile The SQM Series exhibits an exceptional cryogenic performance profile, a critical technical advantage for applications in cold-climate regions or low-temperature industrial environments where conventional hinges often experience performance degradation (e.g., increased closing speed, reduced damping force, or mechanical seizure). Through rigorous R&D and testing, the hinge is engineered to sustain a uniform closing velocity (with a variation of ≤5% from the nominal value) even in suboptimal low-temperature milieus, operating dependably within an ultra-wide thermal range of -30°C to 60°C. To achieve this cryogenic performance, the R&D team implemented a series of targeted technical enhancements: first, the selection of a low-temperature-resistant damping fluid with a pour point of ≤-40°C, which maintains its viscosity and flow characteristics even at -30°C—preventing the "thickening" effect that would otherwise increase damping force or cause the damper to lock up. Second, the use of a specialized elastomeric seal material (fluorosilicone rubber) for the damper's internal seals, which retains its flexibility and sealing performance at low temperatures (with a glass transition temperature of ≤-60°C) and resists hardening or cracking that would lead to fluid leakage. Third, the application of a thermal insulation coating on the hinge's external surfaces, which reduces heat transfer between the hinge and the cold environment, minimizing temperature-induced dimensional changes in the hinge's metal components (e.g., shaft, frame) that could affect its kinematic performance. The hinge's cryogenic performance has been validated through extensive environmental testing in a climate-controlled chamber, where it underwent 10,000 open-close cycles at -30°C with no measurable degradation in closing velocity, damping force, or structural integrity. This ensures reliable operation in a wide range of challenging environments, from cold storage facilities and outdoor installations in polar regions to high-altitude buildings with extreme temperature fluctuations. ## 8. Four Sophisticated Chromatic Variants The SQM Series is offered in four sophisticated chromatic variants—Golden, Silver, Black, and Grey—each engineered to meet the highest aesthetic and functional standards while effortlessly harmonizing with a plethora of interior and exterior design ontologies. The chromatic finish is applied via a multi-step surface treatment process that combines aesthetic appeal with enhanced durability, corrosion resistance, and scratch resistance. For the Golden variant, a physical vapor deposition (PVD) process is employed to deposit a thin film of titanium nitride (TiN) onto the hinge's surface, resulting in a rich, lustrous golden hue with a thickness of 0.5-1.0μm. This finish not only delivers a premium aesthetic but also provides exceptional corrosion resistance (passing 500 hours of neutral salt spray testing per ASTM B117) and a scratch hardness of ≥H on the Mohs scale. The Silver variant utilizes an electrolytic chrome plating process with a trivalent chromium layer (compliant with RoHS and REACH regulations) that achieves a bright, mirror-like finish with a reflectivity of ≥85%. This finish is highly resistant to fingerprints and smudges, making it ideal for high-traffic areas where cleanliness and aesthetics are paramount. The Black variant features a powder coating process with a matte black thermoset polymer (with a gloss level of ≤5 GU at 60°) that provides a sleek, modern appearance while offering superior impact resistance (passing ASTM D2794 impact testing) and chemical resistance to common household cleaners. The Grey variant employs a anodization process on the hinge's aluminum components (where applicable) followed by a dyeing step to achieve a uniform, medium-grey tone with a satin finish (gloss level of 15-25 GU at 60°). This finish is lightweight, corrosion-resistant, and compatible with both contemporary and traditional design styles. Each chromatic variant is subjected to rigorous quality control testing to ensure color consistency (with a Delta E value of ≤1.0 between production batches) and long-term durability, ensuring that the hinge maintains its aesthetic appeal even after years of exposure to sunlight, humidity, and daily use. ## 9. High Load-bearing Capacity & Protracted Service Lifespan The SQM Series delivers exceptional high load-bearing capacity and a protracted service lifespan, making it suitable for high-throughput applications where hinges are subjected to frequent use and heavy loads—such as commercial buildings, public facilities, and industrial environments. Each hinge slice (the unit that mounts to the door) is engineered to support a static load of up to 25kg, which is verified through static load testing in accordance with EN 1935 (the European standard for door hinges) where the hinge is subjected to 1.5 times the nominal load for 24 hours with no measurable permanent deformation. The load-bearing capacity is achieved through a combination of structural design and material selection: the hinge's frame and mounting brackets are fabricated from high-strength cold-rolled steel (with a yield strength of ≥345MPa) that is reinforced at stress concentration points via additional ribbing; the shaft is manufactured from the same high-strength alloy as discussed earlier, ensuring that it can withstand the torsional and bending forces induced by heavy doors; and the mounting hardware (screws, bolts) are made from stainless steel (A2 grade) with a tensile strength of ≥500MPa, preventing pull-out or shear failure. In terms of service lifespan, the hinge boasts a rated service life of 300,000 open-close cycles, which is equivalent to approximately 20 years of use in a commercial setting with an average of 40 cycles per day. This protracted lifespan is validated through accelerated life testing in a mechanical testing rig, where the hinge is operated at a cycle rate of 10 cycles per minute (24 hours a day) for a total of 500 hours—simulating 300,000 cycles—with no significant degradation in performance (e.g., damping force variation ≤10%, closing velocity variation ≤8%, or structural wear ≤0.01mm). To further extend service life, the hinge incorporates a self-lubricating mechanism: the shaft and bearing surfaces are treated with a dry lubricant coating (molybdenum disulfide, MoS₂) that reduces friction and eliminates the need for periodic lubrication, preventing the accumulation of dust and debris that can accelerate wear. ## 10. Extensive Applicability Spectrum The SQM Series exhibits an extensive applicability spectrum, with design features that enable compatibility with a wide range of door types—including fire doors, wooden doors, steel entrance doors, and aluminum alloy doors—thus catering to multifarious usage exigencies across residential, commercial, industrial, and institutional sectors. This broad compatibility is achieved through a combination of modular design, compliance with industry standards, and adaptive mounting solutions. For fire doors (which are subject to strict regulatory requirements for fire resistance and smoke tightness), the hinge is manufactured from fire-resistant materials (with a melting point of ≥1200°C) and is tested in accordance with EN 1634-1 (the European standard for fire and smoke control products) to ensure that it maintains structural integrity and functional capability for at least 60 minutes of exposure to a standard fire curve (temperature reaching 980°C at 30 minutes). The hinge's integrated damping system is also engineered to remain operational during a fire, preventing the door from slamming shut due to thermal expansion or air pressure changes—thus maintaining the door's fire-sealing effectiveness. For wooden doors (which vary widely in thickness, weight, and material density), the hinge offers adjustable mounting plates that can accommodate door thicknesses ranging from 35mm to 50mm, and the damping force can be fine-tuned (via a hidden adjustment screw) to match the door's weight—ensuring optimal performance regardless of the wooden door's specifications. For steel entrance doors (which are typically heavy, thick, and exposed to outdoor elements), the hinge's corrosion-resistant finish (as discussed in the chromatic variants section) and high load-bearing capacity (25kg per slice) make it suitable for withstanding the rigors of outdoor use, while the integrated buffering system protects the steel door and frame from impact damage. For aluminum alloy doors (which are lightweight, corrosion-resistant, and commonly used in modern architecture), the hinge features a lightweight aluminum alloy mounting bracket (to match the door's material) and a low-friction transmission system that ensures smooth operation even with the door's lighter weight. Additionally, the hinge is designed to comply with a range of international standards (e.g., ANSI/BHMA A156.1 for North America, JIS S 2020 for Japan), ensuring that it can be integrated into door systems that adhere to regional regulatory requirements. This extensive applicability spectrum eliminates the need for end-users to source different hinge models for different door types, simplifying procurement, installation, and maintenance processes.

1. 12 Years of Core Tech: Smooth, Stable Operation 12 Years of Hydraulic Damper R&D & Manufacturing – we’ve mastered core tech and hold multiple patents. Ensures smooth, jam-free operation (even high-frequency use) and less post-use maintenance. 2. Dual Authoritative Certifications: Total Quality Peace of Mind Meets GB/T19001-2016 national standard; passed ISO 9001:2015 & SGS certification. Strict full-process quality control – safe for home use, tough for industrial demands, no quality risks. 3. Full-Scenario Coverage: Fits Every Need Home: Great for wardrobes, extendable tables, indoor doors – quiet, no noise. Commercial: Perfect for office sliding doors, display cabinet hinges – stable, no wobble, boosts product texture. Industrial: Ideal for large drawers, equipment slide rails – load-bearing, wear-resistant, durable for heavy use. 4. Flexible Customization + Fast Delivery: No Project Delays Customizable Key Parameters (size, pressure, niche needs). Fast quotes & production – no long waits, keeps your project on schedule. 5. Temp Resistance & Leak-Proof: Reliable in Extremes -45℃~+50℃ Wide Temp Range – stable in extreme cold/hot, no jamming/failure. High-end sealing tech stops oil leakage, cuts maintenance costs & hassle. 6. Durable, Easy Install + Full Support: Total Convenience Durable: High-grade materials (iron, steel, POM) – 50k+ uses (100k+ for premium) – fewer replacements. Easy Install: Simple to assemble/disassemble – lowers labor costs. Support: Pre-sales solutions, after-sales guarantee, stable supply – no stock delays.

1. Extensive Application Scope​ It caters to various scenarios including hinges, sliding doors, slide rails, wardrobes, extendable tables, indoor moving doors, and large drawers, well adapting to the demands of sectors like furniture manufacturing and industrial equipment.​ 2. Premium and Varied Material Selections​ A range of high-grade materials—such as iron, pure steel, polyoxymethylene (POM), and stainless steel casings—are utilized, achieving an ideal balance between structural strength and corrosion resistance to suit different usage environments.​ 3. Flexible Customization Capabilities​ Based on specific application scenarios, key parameters of dampers (including size, shape, and pressure) can be flexibly tailored, ensuring precise alignment with the personalized requirements of various end-use equipment.​ 4. In-depth Accumulation of Core Technologies​ With 12 years dedicated to the R&D and production of hydraulic dampers, the company has gained a firm grasp of core damping technologies. It has also made significant advancements in the field of hydraulic technology and secured multiple patent certifications.​ 5. Authoritative Quality System Endorsement​ The products meet the national technical standard of GB/T19001-2016, attain ISO 9001:2015 international quality management system certification, and undergo strict quality control measures throughout the entire production process.​ 6. Stable Operation Across Wide Temperature Ranges​ Operating within a temperature range of -45℃ to +50℃, the dampers can maintain consistent performance even in extreme temperature conditions, making them suitable for climate environments in multiple regions.​ 7. High-end Leak-proof Sealing Technology​ Top-tier sealing solutions are adopted to effectively prevent oil leakage and seepage issues. This ensures the long-term reliable operation of dampers and significantly lowers maintenance costs.​ 8. Convenient and Efficient Installation & Dismantling​ Designed with practicality as the core, the product features a simple and hassle-free installation and dismantling process. This reduces construction difficulties and enhances assembly efficiency.​ 9. Ultra-long Service Life​ Most products boast a service life of over 50,000 cycles, while some models can even reach the 100,000-cycle usage standard. Their strong durability helps reduce the frequency of replacements.​ 10. Comprehensive Pre-sales and After-sales Support​ Mature pre-sales consultation and after-sales guarantee services are provided, and customized solutions can be developed based on specific needs. Meanwhile, relying on stable production capacity (and future production capacity expansion plans), the company ensures timely and efficient supply.​