{"id":4799,"date":"2026-07-29T14:48:00","date_gmt":"2026-07-29T06:48:00","guid":{"rendered":"https:\/\/blshardware.com\/product\/xd-s01-ottoman-furniture-space-saving-sofa-bed-lifter-pneumatic-storage-hydraulic-with-heavy-duty-gas-spring-bed-lift-mechanism\/"},"modified":"2026-10-03T11:28:35","modified_gmt":"2026-10-03T03:28:35","slug":"ottoman-hydraulic-bed-mechanism","status":"publish","type":"product","link":"https:\/\/blshardware.com\/ru\/product\/ottoman-hydraulic-bed-mechanism\/","title":{"rendered":"BLS Ottoman Hydraulic Bed Mechanism: Best Gas Lift Hardware | BLS Hardware"},"content":{"rendered":"<p>The ottoman hydraulic bed mechanism manufactured and supplied by BLS Hardware is a lift-up storage bed hardware system designed for platform beds and divan bases. Built with precision cold-rolled Q235 carbon steel and dual 1200N high-pressure nitrogen gas pistons, the mechanism provides assisted lifting and controlled access to the storage compartment beneath the bed. BLS Hardware supplies customizable bed-lift hardware for furniture manufacturers, OEM brands, wholesalers, and distributors, with <a href=\"https:\/\/wa.me\/8613827521875\" target=\"_blank\" rel=\"noopener\">WhatsApp engineering consultation<\/a> available for specifications, customization, and B2B quotations.<\/p>\n<p><!-- Block 2: \u673a\u68b0\u5de5\u51b5\u62d3\u6251\u5185\u94fe --><\/p>\n<p>To construct a complete space-saving convertible bedroom suite, manufacturing plants integrate this ottoman hydraulic bed mechanism alongside our structural <a href=\"https:\/\/blshardware.com\/sofa-legs\/\">sofa legs<\/a>, multi-angle <a href=\"https:\/\/blshardware.com\/sofa-hinges\/\">sofa hinges<\/a>, and heavy-duty <a href=\"https:\/\/blshardware.com\/sofa-bed-hardware\/\">sofa bed hardware<\/a> assemblies.<\/p>\n<p><!-- Block 3: Key Features --><\/p>\n<h2>Key Features of Our ottoman hydraulic bed mechanism<\/h2>\n<ul>\n<li><strong>Heavy-Gauge Q235 Steel:<\/strong> 2.5mm thick laser-welded structural steel channel links resist operational bending, torque distortion, and dynamic shear fatigue.<\/li>\n<li><strong>Dual 1200N Nitrogen Gas Pistons:<\/strong> Calibrated industrial pneumatic struts counterbalance heavy mattress foundations, enabling effortless one-handed lifting operation.<\/li>\n<li><strong>Over-Center Geometric Safety Lock:<\/strong> Symmetrical scissor hinge angles maintain reliable stay-open stability to prevent accidental platform descent during loading.<\/li>\n<li><strong>Electrostatic Powder Coating:<\/strong> Corrosion-resistant matte black thermoset epoxy coating protects solid steel pivot rivets and brackets from ambient humidity.<\/li>\n<li><strong>150kg Static Load Capacity:<\/strong> Reinforced steel base flanges distribute mattress and occupant weight evenly across wooden frame carcasses.<\/li>\n<\/ul>\n<p><!-- Block 4: 8 \u884c\u5de5\u89c4\u53c2\u6570\u8868 + CAD \u4ea4\u4e92\u5361\u7247 --><\/p>\n<h2>Technical Specifications<\/h2>\n<table>\n<thead>\n<tr>\n<th>Engineering Parameter<\/th>\n<th>Standard Specification<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Structural Material<\/td>\n<td>Q235 Cold-Rolled Carbon Steel<\/td>\n<\/tr>\n<tr>\n<td>Linkage Thickness<\/td>\n<td>2.5mm Link Bars \/ 3.0mm Mounting Flanges<\/td>\n<\/tr>\n<tr>\n<td>Manufacturing Tolerance<\/td>\n<td>\u00b10.2mm Precision CNC Stamped<\/td>\n<\/tr>\n<tr>\n<td>Hydraulic Pneumatics<\/td>\n<td>Dual 1000N to 1200N Nitrogen Gas Cylinders<\/td>\n<\/tr>\n<tr>\n<td>Surface Finishing<\/td>\n<td>Matte Black Electrostatic Powder Coating<\/td>\n<\/tr>\n<tr>\n<td>Corrosion Resistance<\/td>\n<td>48-Hour Neutral Salt Spray (NSS) Tested<\/td>\n<\/tr>\n<tr>\n<td>Load Bearing Rating<\/td>\n<td>150kg (330 lbs) Combined Platform Capacity<\/td>\n<\/tr>\n<tr>\n<td>Cycle Life Durability<\/td>\n<td>30,000 Repeated Continuous Lifting Cycles<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div class=\"cad-download-trigger\">\n<h3>Download Industrial CAD Engineering Files<\/h3>\n<p>Access precision 2D DWG layout drawings and 3D STEP models for frame joinery and CNC prototyping. Direct Jinli factory verification.<\/p>\n<p><a class=\"cad-button\" href=\"mailto:ZK-ZhengKai@outlook.com?subject=CAD%20Request:%20ottoman%20hydraulic%20bed%20mechanism\">Request CAD Drawings<\/a><\/p>\n<\/div>\n<p><!-- Block 5: Target Applications --><\/p>\n<h2>Target Applications<\/h2>\n<p>Contract bed factories specify this ottoman hydraulic bed mechanism for residential lift-up storage beds, upholstered hotel divan bases, gas-lift platform bedframes, and compact apartment daybeds. Its modular mounting geometry accommodates both foot-end vertical opening and side-access horizontal opening storage configurations without structural frame modifications.<\/p>\n<p><!-- Block 6: 3 \u6b65\u5feb\u901f\u5b89\u88c5\u6307\u5357 --><\/p>\n<h2>3-Step Rapid Installation Guide<\/h2>\n<ol>\n<li>Step 1: Secure the lower steel angle bracket flush against the interior timber bed box using heavy-duty M5 wood screws.<\/li>\n<li>Step 2: Fasten the upper lifting linkage to the movable slatted platform frame ensuring parallel symmetrical alignment on both sides.<\/li>\n<li>Step 3: Snap the hydraulic gas struts onto ball-stud brackets and test full travel range with the mattress installed.<\/li>\n<\/ol>\n<p><!-- Block 7: OEM\/ODM \u5b9a\u5236\u80fd\u529b --><\/p>\n<h2>OEM\/ODM Customization Capabilities<\/h2>\n<p>Operating from our Jinli manufacturing facility, our factory customizes every batch of the ottoman hydraulic bed mechanism to client specifications. We produce tailored bracket lengths, customized mounting hole patterns, variable piston force ratings from 600N to 1500N, and private-label retail packaging. Every production run undergoes automated dimension verification and tensile load testing before container palletization.<\/p>\n<p><!-- Block 8: FAQ --><\/p>\n<h2>Frequently Asked Questions<\/h2>\n<div class=\"faq-item\">\n<h3>What mattress weight does the ottoman hydraulic bed mechanism support?<\/h3>\n<p>Equipped with dual 1200N gas struts, each pair easily lifts mattress and slat assemblies weighing between 60kg and 150kg. Cold-rolled Q235 steel linkages prevent structural twisting during daily operation.<\/p>\n<\/div>\n<div class=\"faq-item\">\n<h3>Can this hardware support both foot-end and side-opening bed frames?<\/h3>\n<p>Yes, versatile pre-drilled bracket configurations allow furniture makers to install the hardware for either foot-end or side-opening beds. Mounting geometry accommodates standard commercial box depths.<\/p>\n<\/div>\n<div class=\"faq-item\">\n<h3>What is the minimum wholesale export order quantity?<\/h3>\n<p>Our standard export MOQ is 100 sets packed in heavy-duty export master cartons. Prototype evaluation sample sets dispatch within 48 hours, and container volume orders ship in 20 days.<\/p>\n<\/div>\n<p><!-- Block 9: RFQ CTA \u8be2\u4ef7\u6846 --><\/p>\n<div class=\"rfq-inquiry-box\">\n<h2>Request Factory Wholesale Quotation<\/h2>\n<p>Contact our engineering sales department for volume price tiers, custom tooling, and export container freight.<\/p>\n<ul>\n<li><strong>WhatsApp:<\/strong> +86 138 2752 1875<\/li>\n<li><strong>Email:<\/strong> ZK-ZhengKai@outlook.com<\/li>\n<li><strong>Factory Address:<\/strong> Jinli Industrial Zone, Gaoyao District, Zhaoqing City, Guangdong Province, China<\/li>\n<\/ul>\n<\/div>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What mattress weight does the ottoman hydraulic bed mechanism support?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Equipped with dual 1200N gas struts, each pair easily lifts mattress and slat assemblies weighing between 60kg and 150kg. Cold-rolled Q235 steel linkages prevent structural twisting during daily operation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can this hardware support both foot-end and side-opening bed frames?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, versatile pre-drilled bracket configurations allow furniture makers to install the hardware for either foot-end or side-opening beds. Mounting geometry accommodates standard commercial box depths.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the minimum wholesale export order quantity?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Our standard export MOQ is 100 sets packed in heavy-duty export master cartons. Prototype evaluation sample sets dispatch within 48 hours, and container volume orders ship in 20 days.\"\n      }\n    }\n  ]\n}\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The <strong>ottoman hydraulic bed mechanism<\/strong> manufactured directly by BLS Hardware in Jinli, Guangdong, China. Engineered as an under-bed storage lifting system for modern upholstered ottoman beds, storage divans, and sectional sofa chaises.<\/p>\n<ul>\n<li><strong>Mechanism Type:<\/strong> Heavy-duty scissor linkage with paired pneumatic nitrogen gas struts<\/li>\n<li><strong>Opening Angle:<\/strong> 45\u00b0 to 55\u00b0 upward tilt angle for open under-bed storage access<\/li>\n<li><strong>Material:<\/strong> Stamped structural carbon steel linkages with heavy cold-riveted pivot points<\/li>\n<li><strong>Gas Strut Ratings:<\/strong> Calibrated piston force options available (e.g., 400N to 1500N matched to mattress weight)<\/li>\n<li><strong>Mounting Versatility:<\/strong> Configurable for vertical end-lift beds or horizontal side-lift storage chaises<\/li>\n<li><strong>Surface Finish:<\/strong> Scratch-resistant electrostatic baked powder coat in matte black or pure white<\/li>\n<li><strong>Direct B2B Sourcing:<\/strong> Factory-direct container and LCL supply with OEM\/ODM bracket customization for furniture factories<\/li>\n<li>WhatsApp Inquiry:\u00a0<a href=\"https:\/\/wa.me\/message\/M6FPBFEHD773P1\">Click to Chat: +8613827521875<\/a>Email Support: ZK-ZhengKai@outlook.com<\/li>\n<\/ul>","protected":false},"featured_media":4798,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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85kg Hydraulic Bed Storage Lift Mechanism | BLS Hardware","author":"ZHENGKAI HARDWARE CO.,LTD","date":"20 \u0430\u0432\u0433\u0443\u0441\u0442\u0430, 2026","format":false,"excerpt":"Model \/ Series: BLS-BL85 (85kg Heavy-Duty Rating per Pair) Mechanism Type: Parallel Bi-Parting Scissor Linkage with Hydraulic Gas Struts Core Material: Heavy-Gauge Cold-Rolled Structural Carbon Steel (Q235) Applications: Ottoman Storage Beds, Lift-Up Platform Beds, Under-Bed Storage Boxes \ud83d\udce6 China Direct Manufacturer Supply | Calibrated Gas Piston Ratings | 2D\/3D STEP\u2026","rel":"","context":"\u041f\u043e\u0445\u043e\u0436\u0430\u044f \u0437\u0430\u043f\u0438\u0441\u044c","block_context":{"text":"\u041f\u043e\u0445\u043e\u0436\u0430\u044f \u0437\u0430\u043f\u0438\u0441\u044c","link":""},"img":{"alt_text":"85kg hydraulic bed storage lift mechanism","src":"https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/08\/hydraulic-bed-storage-lift-mechanism-main.jpg?fit=800%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/08\/hydraulic-bed-storage-lift-mechanism-main.jpg?fit=800%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/08\/hydraulic-bed-storage-lift-mechanism-main.jpg?fit=800%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/08\/hydraulic-bed-storage-lift-mechanism-main.jpg?fit=800%2C800&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":4649,"url":"https:\/\/blshardware.com\/ru\/product\/bls-1500-hydraulic-gas-lift-bed-mechanism\/","url_meta":{"origin":4799,"position":1},"title":"Heavy-Duty Hydraulic Gas Lift Bed Mechanism &#038; Storage Lifter | BLS Hardware","author":"ZHENGKAI HARDWARE CO.,LTD","date":"26 \u0438\u044e\u043b\u044f, 2026","format":false,"excerpt":"The BLS-BM1500 is an industrial-grade hydraulic gas lift bed mechanism engineered for ottoman storage beds, slatted platform beds, and upholstered sofa bed frames. Powered by heavy-duty pneumatic gas struts and reinforced cold-rolled steel channels to deliver silent, effortless lifting and secure top-position holding. Hardware Type: Heavy-Duty Pneumatic Hydraulic Gas Lift\u2026","rel":"","context":"\u041f\u043e\u0445\u043e\u0436\u0430\u044f \u0437\u0430\u043f\u0438\u0441\u044c","block_context":{"text":"\u041f\u043e\u0445\u043e\u0436\u0430\u044f \u0437\u0430\u043f\u0438\u0441\u044c","link":""},"img":{"alt_text":"Wholesale Hydraulic Gas Lift Bed Mechanism for Storage Ottoman Beds","src":"https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/bls-commercial-hydraulic-gas-lift-storage-bed-mechanism-overview.jpg?fit=750%2C750&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/bls-commercial-hydraulic-gas-lift-storage-bed-mechanism-overview.jpg?fit=750%2C750&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/bls-commercial-hydraulic-gas-lift-storage-bed-mechanism-overview.jpg?fit=750%2C750&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/bls-commercial-hydraulic-gas-lift-storage-bed-mechanism-overview.jpg?fit=750%2C750&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":5006,"url":"https:\/\/blshardware.com\/ru\/product\/bls-hydraulic-bed-lift-mechanism\/","url_meta":{"origin":4799,"position":2},"title":"Best Hydraulic Bed Lift Mechanism: Ultimate Silent  | BLS Hardware","author":"ZHENGKAI HARDWARE CO.,LTD","date":"6 \u0430\u0432\u0433\u0443\u0441\u0442\u0430, 2026","format":false,"excerpt":"Brand:\u00a0BLS Hardware (Model: BLS-530) Feature:\u00a0Ultra-quiet \"Opening and Closing Mute\" technology. Sizes:\u00a0Standard 1.2m \/ 1.5m \/ 1.8m (Supports Full Customization). Craftsmanship:\u00a0Premium Black Surface Plating for rust resistance. Weight:\u00a0Professional-grade 15kg per set. Applications:\u00a0High box beds, royal sofas, and modern tatami systems. \u25b2 Factory Floor: Automated metal stamping and surface tumbling for heavy-duty\u2026","rel":"","context":"\u041f\u043e\u0445\u043e\u0436\u0430\u044f \u0437\u0430\u043f\u0438\u0441\u044c","block_context":{"text":"\u041f\u043e\u0445\u043e\u0436\u0430\u044f \u0437\u0430\u043f\u0438\u0441\u044c","link":""},"img":{"alt_text":"Hydraulic Bed Lift Mechanism - BLS AX-H530 Silent Hardware","src":"https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/08\/hydraulic-bed-lift-mechanism.jpg?fit=750%2C750&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/08\/hydraulic-bed-lift-mechanism.jpg?fit=750%2C750&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/08\/hydraulic-bed-lift-mechanism.jpg?fit=750%2C750&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/08\/hydraulic-bed-lift-mechanism.jpg?fit=750%2C750&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":5933,"url":"https:\/\/blshardware.com\/ru\/product\/gas-spring-bed-lifting-mechanism-bls\/","url_meta":{"origin":4799,"position":3},"title":"Gas Spring Bed Lifting Mechanism | Sofa Storage Hardware BLS hardware","author":"ZHENGKAI HARDWARE CO.,LTD","date":"1 \u0441\u0435\u043d\u0442\u044f\u0431\u0440\u044f, 2026","format":false,"excerpt":"BLS-201 Heavy-Duty Gas Spring Bed Lifting Mechanism (\u041c\u0435\u0445\u0430\u043d\u0438\u0437\u043c \u043f\u043e\u0434\u044a\u0435\u043c\u0430 \u043a\u0440\u043e\u0432\u0430\u0442\u0438 \u0441 \u0433\u0430\u0437\u043b\u0438\u0444\u0442\u043e\u043c) by BLS Hardware is a commercial-grade hydraulic pneumatic lifting kit engineered for modular sectional chaise storage sofas, under-bed storage boxes, tatami lift platforms, and ottoman sleeper couches. Constructed from high-tensile Q235 cold-rolled carbon steel paired with high-pressure nitrogen\u2026","rel":"","context":"\u041f\u043e\u0445\u043e\u0436\u0430\u044f \u0437\u0430\u043f\u0438\u0441\u044c","block_context":{"text":"\u041f\u043e\u0445\u043e\u0436\u0430\u044f \u0437\u0430\u043f\u0438\u0441\u044c","link":""},"img":{"alt_text":"Heavy-Duty Gas Spring Bed Lifting Mechanism for Sectional Chaise Storage Sofas","src":"https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/09\/Gas-Spring-Bed-Lifting-Mechanism-.jpg?fit=600%2C600&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/09\/Gas-Spring-Bed-Lifting-Mechanism-.jpg?fit=600%2C600&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/09\/Gas-Spring-Bed-Lifting-Mechanism-.jpg?fit=600%2C600&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":4469,"url":"https:\/\/blshardware.com\/ru\/product\/gas-spring-storage-lift-mechanism\/","url_meta":{"origin":4799,"position":4},"title":"Heavy-Duty Gas Spring Storage Lift-Up Hinge Mechanisms | BLS Hardware","author":"ZHENGKAI HARDWARE CO.,LTD","date":"24 \u0438\u044e\u043b\u044f, 2026","format":false,"excerpt":"Compact heavy-duty hydraulic gas spring storage lift mechanism engineered for sectional sofa chaises, upholstered storage ottomans, and window benches. Controlled Hydraulic Lift: Calibrated nitrogen gas pistons (200N to 600N) provide smooth hands-free stay-open support and soft deceleration. Compact Bracket Profile: Shorter base plate footprint designed specifically to fit narrow sofa\u2026","rel":"","context":"\u041f\u043e\u0445\u043e\u0436\u0430\u044f \u0437\u0430\u043f\u0438\u0441\u044c","block_context":{"text":"\u041f\u043e\u0445\u043e\u0436\u0430\u044f \u0437\u0430\u043f\u0438\u0441\u044c","link":""},"img":{"alt_text":"Wholesale Gas Spring Storage Lift Mechanism for Ottoman and Sofa Storage","src":"https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/img_alibaba1784858795.jpg?fit=1024%2C1024&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/img_alibaba1784858795.jpg?fit=1024%2C1024&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/img_alibaba1784858795.jpg?fit=1024%2C1024&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/img_alibaba1784858795.jpg?fit=1024%2C1024&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":5347,"url":"https:\/\/blshardware.com\/ru\/product\/furniture-ottoman-lift-up-mechanism\/","url_meta":{"origin":4799,"position":5},"title":"Heavy-Duty Furniture Ottoman Lift Up Mechanism| Factory Wholesale | BLS hardware","author":"ZHENGKAI HARDWARE CO.,LTD","date":"15 \u0430\u0432\u0433\u0443\u0441\u0442\u0430, 2026","format":false,"excerpt":"Commercial-grade furniture ottoman lift up mechanism engineered for upholstered storage footstools, entryway shoe benches, and toy chests. Fabricated by Zhengkai Hardware Factory from 2.5mm cold-rolled Q235 structural steel with high-tensile 65Mn coil springs. Delivers an effortless 80\u00b0\u201390\u00b0 wide-angle opening with zero maintenance and zero hydraulic oil-leak risks. 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