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Leading Manufacturer Bosswinn Heavy-Duty Custom Shaft Housing Compression Springs¹

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Product Description Product Description Bosswinn - Heavy-Duty & Custom Compression Springs with Integrated Housing SolutionsBosswinn is a trusted and experienced manufacturer of high-performance compression springs, serving a broad spectrum of industries including automotive, industrial machinery, construction equipment, electronics, and more. With a strong focus on quality, durability, and customization, Bosswinn also provides integrated spring housing solutions, ensuring secure installation and optimized mechanical function in critical assemblies.Why Housing MattersThe spring housing plays a vital role in applications that require:Stable positioning of the spring under dynamic loadsProtection against dust, moisture, or impactSimplified assembly in complex mechanical systemsNoise reduction and improved vibration dampingWhether in automotive suspension, vibration isolation mounts, or industrial actuators, housing-enhanced springs extend the system's service life and performance. Bosswinn combines engineering excellence with production flexibility to deliver spring + housing systems tailored to your specific project requirements. From design consultation to volume manufacturing, we provide comprehensive support at every stage.Main Parameters of Bosswinn Compression Springs with HousingCategoryDetailsProduct TypeHeavy-Duty Compression Springs with Optional HousingWire Diameter Range0.5 mm - 8.0 mm (custom sizes available)Outer Diameter Range4 mm - 80 mmFree Length10 mm - 500 mm (customizable based on application)Spring Load CapacityUp to 5,000 N (special designs available upon request)Working Stroke5% - 30% of free length (standard)Material OptionsMusic Wire, Stainless Steel (SUS304, SUS316), Chrome Silicon, Inconel, Carbon SteelHousing MaterialsPowder-Coated Carbon Steel, Aluminum Alloy, Engineering PlasticsHousing TypePress-fit, Bolt-on, or Integrated Cartridge (customizable)Manufacturing ProcessCNC Precision Coiling, Heat Treatment, Stress RelievingSurface TreatmentsBlack Oxide, Electroplating (Zn/Cr), E-coating, Polishing, Shot PeeningApplicationsAutomotive, Industrial Machinery, Construction, Mining, Agricultural EquipmentOperating Temperature-40°C to +250°C (material dependent)TolerancesOD ±0.05 mm, Load ±5%, Length ±1 mm (can be adjusted per spec)CertificationsISO 9001:2015, RoHS Compliance, SGS Test Reports (available on request)MOQNo MOQ for standard items; 10,000 pcs preferred for mass productionPackaging OptionsPE Bags + Cartons, Plastic Cases, or Custom Protective HousingShipping PortsNingbo / Shanghai (Sea), Hangzhou / Shanghai (Air)Lead Time10-15 working days (standard), up to 30 days in peak season or for custom housings Our products advantagesKey Features of Bosswinn Compression Springs with Housing CapabilitiesHeavy-Duty EngineeringBosswinn's compression springs are designed to endure extreme loads, high stress, and long service cycles, making them ideal for rugged applications such as suspension systems, industrial presses, and heavy machinery.Custom Design & Housing IntegrationWe offer custom-engineered springs with optional housing units that improve performance, alignment, and ease of assembly. These housings protect the spring from environmental damage and enhance structural support in dynamic applications.Custom housing options: steel housings, plastic inserts, sealed cartridgesPrecision alignment for axial load controlPre-installed or standalone spring + housing setsPremium MaterialsAll springs and housings are produced from high-grade materials selected for strength, fatigue resistance, and corrosion protection:Spring Wire Options: Music wire, stainless steel (SUS304, SUS316), chrome silicon, Inconel, carbon steelHousing Materials: Carbon steel, powder-coated steel, aluminum alloy, high-impact plastic (for light-duty use)Advanced Manufacturing TechniquesBosswinn utilizes CNC precision coiling, automated stress relieving, and in-process inspection to ensure dimensional accuracy, consistency, and reliability of both the spring and its housing components.CNC coiling tolerance: ±0.05 mmLoad test deviation: ≤5%Optional surface treatments: Zinc plating, black oxide, e-coatingIndustry-Standard ComplianceBosswinn springs and integrated housing units are produced in accordance with international quality standards, including:ISO 9001:2015ASTM A228/A313DIN 2098 / EN 13906-1 Our production Production Management Key Points for Compression Springs with Housing1. Raw Material ControlSupplier Qualification: Use only approved vendors with certification (ISO, SGS, RoHS).Incoming Inspection: Verify material grade, wire diameter, surface finish, and traceability.Traceability: Batch numbers marked on material rolls and linked to production records.2. Process Planning & Job RoutingProduction Flowchart: Wire → Coiling → Heat Treatment → Surface Treatment → Assembly (Housing) → Final Inspection.Work Instructions: Detailed SOPs for each process station to ensure consistency.Job Card Management: Each batch tracked with a unique job card for real-time progress monitoring.3. CNC Coiling & Heat TreatmentPrecision Coiling: Tolerances controlled to ±0.05 mm using CNC machines.Automatic Stress Relieving: Springs are heat-treated at 280°C-450°C to enhance fatigue life.Machine Calibration: CNC coilers are calibrated weekly; data logged and archived.4. Housing Preparation & AssemblyHousing Fabrication: Housings are cut, machined, or formed according to spring size and load requirements.Surface Prep: Deburring, powder coating, or anodizing depending on customer specification.Spring-Housing Assembly: Verified by jig-based installation for accurate positioning.5. In-Process Quality ControlFirst Article Inspection (FAI): Every batch's first piece inspected for dimension, hardness, and alignment.In-line Checks: Load force, free length, and spring rate verified during coiling and after housing assembly.Dimensional Checks: Use of calipers, load testers, and vision measuring systems (VMS).6. Final Inspection & TestingLoad Testing: Compression force measured at specific strokes (e.g., 25%, 50%, 75%).Durability Testing: Life cycle tests (e.g., 100,000 cycles) for automotive-grade springs.Housing Fit Test: Ensures spring seating, no wobble or misalignment under simulated conditions.7. Documentation & Batch ControlInspection Records: Each lot accompanied by dimensional and load testing reports.Certifications Issued: COA (Certificate of Analysis), Material Certs, Surface Treatment Records.Production Reports: Daily output, rework rate, and downtime tracked and reviewed weekly.8. Packaging & LogisticsProtection: Anti-rust oil, plastic tubing, or shrink-wrapping for corrosion prevention.Labeling: QR codes or barcodes with batch number, date, and inspection status.Packing Options: PE Bags + Cartons, or Custom Plastic Cases for spring + housing units.9. Continuous ImprovementKaizen Activities: Regular production team reviews to improve cycle time and reduce defect rates.Customer Feedback Loop: Returned product reports analyzed to adjust process parameters.Lean Manufacturing: WIP (work-in-progress) control, 5S, and process efficiency targets maintained. Our quality control Bosswinn Quality Control Process for Compression Springs with Housing1. Raw Material InspectionItemInspection StandardTools UsedMaterial CertificationVerify material grade & composition (SUS, SWC, etc.)Mill certs, supplier documentsWire DiameterTolerance: ±0.02 mmMicrometer, Vernier caliperSurface ConditionFree from rust, scratches, or deformationVisual + Surface GaugeHousing Material CheckAlloy type, thickness, hardnessHardness tester, thickness gauge 2. In-Process Quality Control (IPQC)Spring CoilingCheckpointStandardFrequencyOuter Diameter±0.05 mmEvery 30 minsFree LengthAs per drawingEvery 30 minsCoil Pitch UniformityConsistent throughoutSpot-check every batchSpring Rate (K)±5% tolerance100% for new batches Housing Fit and AssemblyCheckpointStandardMethodPress Fit Tolerance±0.03 mmDigital micrometerSeating AlignmentSpring fully seated; no tilt/wobbleVisual + fixture checkPreload AccuracySpecified load force achieved in housingLoad tester 3. Heat Treatment & Stress ReliefItemControl MeasureInspection ToolHeating Temperature280-450°C depending on materialThermal controllerSoak Time≥20 minutes for full stress reliefTime loggerPost-Treatment HardnessVerify expected spring hardness (e.g., HRC 44-50)Rockwell hardness tester 4. Surface Treatment QualityProcessCheckpointsToolsElectroplating / CoatingThickness: 5-25 μm, No peelingCoating thickness gaugeBlackening / PolishingUniform color, rust-free surfaceVisual, salt spray testSalt Spray Test (Optional)>48 hrs for Zn coating (ASTM B117)Salt spray chamber 5. Final Inspection (OQC - Outgoing Quality Control)ItemSpecificationSampling StandardDimensional AccuracyAccording to final drawingAQL 0.65/1.0/2.5Load at Set CompressionWithin ±5% of specLoad testerAssembly Fit (Housing)Smooth operation, no interferenceManual + fixtureAppearance CheckNo oil, burrs, rust, or mechanical damageVisualPackagingCorrect labeling, protective packing intactManual + checklist 6. Testing Examples (Real Data)Test TypeSpec LimitSample Result30 mm Spring Load95 ± 5 N96.2 NFree Length (unloaded)50 ± 0.5 mm49.85 mmHousing Fit Tolerance0.03 mm max0.015 mmSalt Spray (Zn Coated)≥48 hrs no rust72 hrs passedHardnessHRC 44-48HRC 46 7. Documentation & TraceabilityBatch Records: Every lot is assigned a traceable batch code.Test Reports: Available upon request (includes dimension, load, hardness).Material Certs: Attached to shipments for customer verification.Inspection Sheets: Signed by QC and filed digitally for 3+ years. Packaging & Shipping Applications Applications of Compression SpringsHelical compression springs are one of the most widely used and versatile types of springs. Available in a vast range of sizes, stiffness levels, and configurations, these springs can be customized to meet the unique requirements of nearly any application. Their design flexibility allows them to be manufactured in various shapes and geometries to suit both standard and specialized uses.Thanks to their adaptability, compression springs are commonly found in:Medical devices and diagnostic equipmentConsumer electronicsPrecision instruments and toolsIndustrial and mechanical equipmentMining and drilling machineryStationery products such as pens and notebooksToys and mechanical gadgetsMattresses and bedding systemsAnd many other everyday applicationsCompression springs are so deeply embedded in our daily lives that their presence often goes unnoticed-yet they play a crucial role in the function of countless products and machines. Industries That Rely on Compression SpringsCompression springs are an essential component for numerous Original Equipment Manufacturers (OEMs) across a wide range of sectors. Their mechanical strength, durability, and design simplicity make them ideal for supporting consistent performance under dynamic loads.At Bosswinn, we specialize in supplying both high-volume production and custom spring solutions tailored to our clients' exact needs. Whether you're developing a new product or scaling up manufacturing, we are equipped to handle orders of all sizes with reliability and efficiency.Industries we commonly serve include:Manufacturing & AutomationTransportation & AutomotiveConstruction & InfrastructureMaterial Handling SystemsAgriculture & Farm EquipmentPetrochemical & EnergyAerospace & AviationConsumer Products & ElectronicsWe take pride in delivering precision-engineered springs that perform reliably under the most demanding conditions. For custom solutions or large-volume inquiries, don't hesitate to contact us for a quote or technical consultation.Get Compression Springs for Your Products, Machines and MoreWe specialize in designing and fulfilling small and large orders of custom springs. Our compression springs have been used in products and applications all across the country, and our expert engineers have been working in this field for years.Even if you aren't certain which type of custom spring you need, our team can help you find the right solution. Our team has the ability to create the most precise spring for any application, so contact us today to find a superior product that is specially designed to meet your precise specifications. FAQ1. Is Bosswinn a manufacturer?A: Yes. Bosswinn is a direct manufacturer with two fully equipped production facilities located in Zhuji, Zhejiang Province, China.We specialize in:Spring manufacturing: Compression, extension, torsion, ramp springs, damping springs, custom wire formsPrecision CNC machining: Turning, milling, threading, grinding, and drillingMetal stamping: Punching, forming, blanking, and custom die fabricationWith over 10 years of experience and a skilled workforce, we offer end-to-end manufacturing solutions, including design support, prototyping, bulk production, and quality assurance. 2. What is the standard delivery time?A:Regular Orders: 10-15 working daysPeak Season (March-June, September-December): Up to 25-30 days depending on complexity and volumeTooling or Custom Parts: Additional 7-10 days for mold or die developmentUrgent Orders: Expedited service available based on capacityWe use ERP systems for production planning and order tracking to ensure consistent on-time delivery. 3. What is your Minimum Order Quantity (MOQ)?A:We aim to support businesses of all sizes:Trial Orders or New Customers: No MOQ, small quantities (e.g., 100 pcs or less) are welcomeMass Production: 10,000 pcs or more is preferred for standard parts to reduce unit costCustomized Products: MOQ may vary based on tooling, raw materials, and technical requirementsWe believe in building long-term partnerships and are open to flexible arrangements for startups or R&D stages. 4. What payment methods do you accept?A:To accommodate global buyers, we offer multiple secure payment options:T/T (Bank Transfer): 30% deposit, 70% balance before shipment (standard term)L/C (Letter of Credit): Accepted for high-value international ordersWestern Union / PayPal: For small orders or sample feesCredit Terms: Negotiable for long-term clients with established historyAll payments are invoiced with full documentation and aligned with international trading standards. 5. How can we confirm samples before mass production?A:We provide free samples (for standard products) and custom samples based on your technical drawings or specifications.Sample Lead Time: 3-7 working daysCustom Tooling Lead Time (if needed): 7-15 daysShipping Method: DHL, FedEx, UPS, or your designated forwarderApproval Process: Once confirmed, samples are recorded as production referencesOur R&D team can also assist with design modification, performance optimization, and material selection before formal production. 6. What materials do you use in production?A:We work with a wide range of high-quality materials sourced from certified suppliers:Spring Steel: 60Si2Mn, SUP9, SUP10, 51CrV4, ASTM A229, A228 (Music Wire), A313Stainless Steel: SUS304, SUS316, SUS631 (17-7PH)Carbon Steel & Alloy Steel: SWC, SAE9254, SEA9260, 6150Other Metals: Brass, Phosphor Bronze, Copper, Aluminum (for stamping or machining)All materials comply with RoHS, REACH, and ISO standards where applicable. 7. How do you ensure quality control?A:We maintain strict QC at every stage:Incoming Material InspectionIn-Process Checks (dimensional, hardness, tensile)Load & Fatigue TestingFinal Inspection and DocumentationCertifications:ISO 9001:2015SGS & RoHS Testing (upon request)PPAP documentation for automotive customersWe use calibrated equipment such as digital calipers, spring testers, hardness testers, and vision inspection systems. 8. Do you offer OEM/ODM service?A:Yes. We offer:OEM: Produce according to your drawings and specificationsODM: Design and develop based on functional requirements or product conceptsReverse Engineering: From sample to drawing, prototype, and mass productionOur engineering team supports 2D/3D file formats such as PDF, DWG, STEP, and IGS. 9. What packaging and shipping options are available?A:Standard Packing: Plastic bags + Carton boxesCustom Packing: Wooden crates, plastic containers, barcode labelingShipping Methods:By sea (Ningbo / Shanghai Port)By air (Shanghai Pudong / Hangzhou Xiaoshan Airport)By express (DHL, FedEx, UPS)We ensure all goods are packaged securely to prevent transit damage. 10. Can we visit your factory or audit your process?A:Yes, we welcome factory visits and third-party audits. You can schedule:Virtual Tour (via Zoom/Teams)On-site Audit by your QA Team or AgentIn-person Visit (support for visa invitation letters available)

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