STS is an escrow service that protects both buyers and suppliers. Funds are held securely by Made-in-China.com until order terms (e.g., delivery, quality) are fulfilled
|
Still deciding? Get samples of $ !
Request Sample
|
| Customization: | Available |
|---|---|
| Function: | Phonation, Drive, Restoration, Measurement |
| Material: | Steel |
| Shipping Cost: | Contact the supplier about freight and estimated delivery time. |
|---|
Payment Guarantee
Platform-protected payments with refund support for eligible order issues.
Platform Logistics
Inspection Service
After-Sales & Dispute Handling
Suppliers with verified business licenses
Audited Supplier Audited by an independent third-party inspection agency
Key Features:
Optimized spring rate for EV-specific weight distribution
Durable steel or alloy spring material for extended service life
Precision damping to ensure stability and handling control
Anti-corrosion coating for long-term reliability
Compatible with regenerative braking systems
| Item | Specification |
|---|---|
| Spring Type | Helical Coil Spring (Compression Type) |
| Spring Material | High-Carbon Steel / Chrome-Silicon Alloy Steel |
| Spring Wire Diameter | Ø8 mm - Ø14 mm (customizable based on load) |
| Spring Outer Diameter | 70 mm - 120 mm |
| Spring Free Length | 200 mm - 450 mm |
| Spring Rate (Stiffness) | 20 - 80 N/mm (depending on EV weight and usage) |
| Shock Absorber Type | Hydraulic / Gas-Charged Twin Tube or Mono Tube |
| Damping Force (Compression) | 500 - 2000 N @ 0.3 m/s |
| Damping Force (Rebound) | 800 - 3000 N @ 0.3 m/s |
| Mounting Type | Eye-to-Eye / Eye-to-Pin / Stud-to-Eye (as required) |
| Stroke Length | 100 mm - 250 mm |
| Overall Length (Extended) | 300 mm - 600 mm |
| Load Capacity | 300 kg - 1000 kg per unit |
| Surface Treatment | Powder Coated / Zinc Plated / E-Coated |
| Corrosion Resistance | 240 - 480 Hours (Salt Spray Test) |
| Noise/Vibration Performance | Low NVH, compliant with EV standards |
| Working Temperature Range | -40°C to +120°C |
| Durability Test Cycle | ≥1,000,000 cycles (standard road simulation) |
| Customization | Spring rate, damping curves, dimensions, mount types |
Material Selection: Use certified spring steels (e.g. 60Si2Mn, 65Mn, SUS304) with proper mechanical and chemical properties.
Incoming Inspection: Test for hardness, surface defects, and chemical composition using spectrometer and hardness testers.
Material Traceability: Ensure all materials have batch numbers and supplier certificates for full traceability.
Order Review: Analyze technical drawings, tolerances, and usage requirements before production begins.
Work Instructions: Generate clear process documents (routing sheets) for each spring type.
Machine Allocation: Assign coiling, grinding, and forming machines based on spring size, wire diameter, and load type.
Production Timeline: Maintain real-time scheduling using ERP/MES systems to manage capacity and deadlines.
Precision Coiling: Use CNC or automatic spring coiling machines for consistent pitch, coil diameter, and free length.
Tooling Maintenance: Regularly inspect and replace mandrels, arbors, and guides to prevent deviation or scratches.
Intermediate Inspection: Measure free length, outer diameter, and coil count during coiling to avoid rework.
Tempering & Quenching: Set precise temperature and soaking time to achieve required tensile strength and toughness.
Stress Relief: Apply low-temperature baking to reduce internal stress and ensure dimensional stability.
Process Monitoring: Record temperature logs and maintain uniformity in furnace load for batch consistency.
Deburring & Polishing: Remove burrs and sharp edges after coiling.
Coating: Apply black oxide, zinc plating, phosphate, or powder coating for corrosion resistance.
Salt Spray Testing: For high-end applications (automotive, marine), validate surface treatment with salt fog test (ASTM B117).
Routine Checks: Free length, outer diameter, wire diameter, pitch, and end configuration checked with calipers, micrometers, and gauges.
Load Testing: Perform static and dynamic load-deflection tests using calibrated spring testers.
Fatigue Testing: Simulate working cycles (e.g. 10,000-50,000 cycles) to ensure product endurance.
Protective Packaging: Use anti-rust bags, foam separators, or vacuum-sealing for surface-treated springs.
Labeling & Traceability: Each carton includes lot numbers, material codes, and test status labels.
On-Time Shipping: Coordinate logistics to meet customer lead times and minimize transit risk.
Inspection Reports: Provide dimensional and mechanical test reports with each batch.
Certifications: Support ISO 9001, IATF16949, ROHS, and REACH compliance.
Continuous Improvement: Use feedback and internal audits (PDCA/5S/Six Sigma) to enhance processes.
Ensure mechanical performance, durability, safety, and dimensional accuracy of coil springs used in EV suspension shock absorbers.
| Item | Specification | Inspection Method | Frequency |
|---|---|---|---|
| Spring steel wire | Grade: 55CrSi, SAE9254, SUP9A, etc. Diameter tolerance: ±0.05 mm |
Material certificate, Spectrometer, Micrometer | Every batch |
| Surface condition | Free from rust, cracks, scale | Visual, Magnetic particle test | Each coil bundle |
| Mechanical properties | Tensile strength, elongation | Universal testing machine | Per batch |
| Process | Control Point | Method | Frequency |
|---|---|---|---|
| Coiling | Diameter, pitch, coil gap, number of turns | Caliper, Go/No-go gauge | Every 30 pcs |
| Heat Treatment | Hardness HRC 44-52 (as per spec) | Rockwell hardness test | Every lot |
| Shot Peening | Compressive residual stress, surface uniformity | Residual stress meter, Visual | Sampling per shift |
| End Grinding | Flatness ≤0.5mm | Flatness gauge | Every 30 pcs |
| Surface Coating | Uniformity, thickness ≥20μm (zinc or powder) | Coating thickness tester | Each batch |
| Test | Standard/Spec | Method | Frequency |
|---|---|---|---|
| Spring Load Test | Must meet force at 50% deflection ±5% | Spring load tester | 100% or AQL sampling |
| Fatigue Life Test | ≥ 300,000 cycles (no breakage or fatigue) | Fatigue test rig | Per design validation and sample lot |
| Dimensional Check | Free length, outer diameter, pitch | Vernier caliper, fixture | 100% or random per lot |
| Salt Spray Test | ≥ 240 hours corrosion resistance | ASTM B117 / Salt spray chamber | Per coating batch |
| Set Test (Height loss) | ≤ 2% height loss after 3 compressions | Height comparator | Sampling batch |
| Item | Requirement | Method | Frequency |
|---|---|---|---|
| Visual Inspection | No cracks, rust, deformation, or sharp edges | Visual check | 100% |
| Dimensional Tolerance | ± tolerances on free length, diameter, etc. | Caliper, Go/No-go gauge | 100% |
| Load Accuracy | Within 5% of target load at defined deflection | Load testing machine | Sample or 100% if critical use |
| Label & Traceability | Correct part number, batch code, QC stamp | Label check | 100% |
| Defect | Cause | Prevention |
|---|---|---|
| Spring cracking | Improper material, poor heat treatment | Use certified steel, verify hardness |
| Uneven pitch/coil | Coiling machine issue | Regular calibration, operator training |
| Early fatigue failure | Inadequate shot peening or heat treat | Strict fatigue testing, peening control |
| Corrosion | Coating defects or storage | Improve surface treatment and packaging |
Use anti-rust oil or bags for storage
Each spring is packed in protective sleeves or foam
Label with batch number, part code, and production date
Avoid stacking or crushing during transport
Maintain inspection reports (IQC, IPQC, FQC)
Traceability via batch codes and serial numbers
Calibration records for measuring equipment
Supplier certificates for material
Car shock absorber springs are precision components critical to the performance and safety of a vehicle's suspension system. To ensure these springs reach customers in perfect condition, proper packaging and delivery procedures must be followed. The goal is to protect the springs from damage, corrosion, deformation, or loss during storage and transportation.
Proper packing involves using secure and cushioned materials to prevent movement and impact, while effective delivery planning ensures timely and safe arrival. By adhering to well-defined packing standards, manufacturers can maintain product integrity, customer satisfaction, and brand reputation.
The following outlines best practices for packing and delivering car shock absorber springs professionally and safely.
Bosswinn shock absorber springs and suspension springs are engineered to deliver superior performance, safety, and durability in modern automotive systems. Designed to withstand high dynamic loads and frequent cycling, these precision-formed coil springs play a vital role in vehicle ride comfort, handling stability, and suspension resilience.
Bosswinn suspension springs are widely used across a range of passenger vehicles, electric cars, SUVs, and light trucks. Their primary function is to absorb road shocks, maintain vehicle height, and ensure consistent tire-road contact, thereby improving braking response and cornering control.
With advanced manufacturing technology, strict quality control, and material excellence, Bosswinn springs are trusted in OEM assembly lines, aftermarket repair services, and performance vehicle upgrades. Whether for front or rear suspension systems, standard or heavy-duty models, Bosswinn provides reliable solutions tailored to automotive needs.
Zhuji Bosswinn Springs Co., Ltd. is a trusted manufacturer specializing in the design, development, and production of high-performance spring components. With advanced facilities and experienced engineers, we provide customized and standard solutions for various industries.
Custom Spring Manufacturing
Precision-made compression springs, tension springs, torsion springs, and wire forms based on your drawings or samples.
Damping, Suspension & Brake Chamber Springs
Engineering and mass production of springs for automotive, truck, and industrial damping systems.
OEM & ODM Services
Full support from concept design to finished product, including tooling development and sample validation.
CNC Machining & Stamping Parts
Production of precision-machined and punched metal components to complement spring assemblies.
Surface Treatment & Heat Treatment
In-house processes including tempering, black oxide coating, powder coating, and plating to enhance durability and corrosion resistance.
Quality Control & Testing
Comprehensive QC procedures, including load testing, fatigue testing, dimensional inspection, and material certification.
Zhuji Bosswinn is committed to on-time delivery, stable quality, and responsive customer service for both domestic and international clients.
Q1: What types of vehicles are Bosswinn shock absorber springs suitable for?
A: Bosswinn suspension springs are designed for a wide range of vehicles including electric cars, passenger sedans, SUVs, light commercial vehicles, and modified performance cars. Custom solutions are also available for OEM and aftermarket applications.
Q2: What materials are used for manufacturing Bosswinn suspension springs?
A: We use high-grade alloy spring steels such as 55CrSi, SUP9A, SAE9254, and customized materials based on customer requirements. All materials are sourced with full certification and tested for mechanical performance.
Q3: How do you ensure the quality of each spring?
A: Every spring undergoes strict quality control including dimensional checks, hardness tests, load performance testing, fatigue testing (≥300,000 cycles), and surface inspections. We also perform salt spray tests to evaluate corrosion resistance of coated parts.
Q4: Can Bosswinn customize spring dimensions and characteristics?
A: Yes. Bosswinn offers full customization services, including variable pitch, progressive rate design, free length, coil diameter, spring force, and surface treatment. Customers can submit technical drawings or specifications for tailored development.
Q5: What surface treatments are available for spring protection?
A: Our springs can be treated with black oxide, powder coating, electrophoresis, or zinc plating to ensure excellent corrosion resistance, aesthetic finish, and extended service life in harsh conditions.
Q6: What packaging options are available for shipping springs?
A: Springs are individually wrapped or nested in foam trays, anti-rust packaging, and packed in reinforced cartons or wooden crates. Each shipment is labeled with part number, quantity, and production batch code for full traceability.
Q7: Do you support small quantity orders or sample production?
A: Yes. We accept sample orders and low-volume batches for testing, prototyping, or specialty use. Lead time and cost will vary depending on complexity and material availability.
Q8: How long is the typical production and delivery time?
A: For standard models, lead time is usually 7-15 days. Custom springs may require 15-25 days depending on design complexity and tooling needs. We offer international shipping with secure and timely delivery.
){kind=link}