| Customization: | Available |
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| Function: | Phonation, Drive, Restoration, Measurement |
| Material: | Steel |
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At Bosswinn, we specialize in designing and manufacturing high-performance tension springs that deliver reliability and exceptional strength. Engineered to meet the most demanding industrial needs, our tension springs are crafted using top-quality materials, ensuring consistent performance under high stress and tension.
Whether you're looking for standard or custom solutions, Bosswinn's tension springs provide optimal force in a compact design, offering outstanding durability and longevity. They are ideal for a wide range of applications including automotive, machinery, electronics, and more.
High-Quality Materials: Manufactured from premium steel alloys, ensuring strength, corrosion resistance, and durability.
Precision Engineering: Designed to provide precise force over extended lifecycles, reducing wear and increasing reliability.
Custom Solutions: We offer tailored specifications to meet unique design requirements and application needs.
Material Grade
Standard:
Carbon Steel (ASTM A228): For general applications with good strength and flexibility.
Stainless Steel (AISI 302): Ideal for corrosion-resistant applications.
Alloy Steel (SAE 5160): High strength, used for heavy-duty applications.
Wire Diameter (d)
Example Range:
Small Springs: 0.3mm to 3mm
Medium Springs: 3mm to 8mm
Large Springs: 8mm to 20mm
Example: 2mm wire diameter for general use in automotive components.
Outer Diameter (OD)
Example Range:
Small Springs: 5mm to 25mm
Large Springs: 50mm to 200mm
Example: 30mm outer diameter for machinery use.
Spring Length (L)
Free Length:
Small Springs: 20mm to 100mm
Large Springs: 100mm to 500mm
Example: 150mm free length, suitable for medium industrial equipment.
Extended Length:
Typically 1.5 to 3 times the free length, depending on application.
Example: 150mm free length, extended to 450mm in heavy-duty applications.
Tensile Strength
Example:
Carbon Steel: 1,000 MPa (145,000 psi)
Stainless Steel: 2,500 MPa (362,000 psi)
Alloy Steel: 2,200 MPa (319,000 psi)
Example: Stainless steel tension spring with 2,500 MPa tensile strength for high-performance applications.
Tension Force
Example Calculation:
A 2mm wire diameter spring with an outer diameter of 30mm and 100mm free length may generate a force of 50N (Newtons) when stretched by 50mm.
Spring Rate (k)
Example:
For a spring with a 5mm wire diameter and 30mm outer diameter, the spring rate might be 15 N/mm.
Example: Medium spring with a spring rate of 12 N/mm for balanced force application in machinery.
Coil Diameter (D)
Example:
Small Springs: 2mm to 15mm
Large Springs: 20mm to 50mm
Example: Coil diameter of 15mm for automotive applications.
Number of Coils (n)
Example:
Small Springs: 3 to 10 coils
Medium Springs: 10 to 30 coils
Large Springs: 30 to 100 coils
Example: 20 coils for medium industrial use, providing a balanced elongation and force capacity.
End Type
Plain Ends:
Example: For general machinery and low-stress applications.
Closed Ends:
Example: For heavy-duty applications, reducing the risk of elongation failures.
Hooks:
Example: Used for springs in applications requiring easy installation and secure attachment (e.g., trampolines).
Maximum Operating Temperature
Example:
Standard Carbon Steel: Up to 150°C
Stainless Steel: Up to 250°C
Alloy Steel: Up to 300°C
Example: Stainless steel tension spring rated for up to 250°C for high-temperature environments.
Corrosion Resistance
Example Coating:
Zinc Plating: Good corrosion resistance for moderate environments.
Chrome Plating: Enhanced resistance for more demanding environments.
Stainless Steel: Excellent resistance without additional coatings.
Example: Zinc-coated spring for outdoor equipment, offering basic corrosion protection.
Fatigue Resistance
Example:
Carbon Steel: 1 million cycles
Stainless Steel: 3 million cycles
Alloy Steel: 5 million cycles
Example: Alloy steel tension spring designed to endure 5 million cycles under heavy loading conditions.
Tolerance Range
Example:
Wire Diameter: ±0.05mm
Spring Length: ±1mm
Outer Diameter: ±0.5mm
Example: A spring with a tolerance range of ±0.05mm on wire diameter for precise applications like electronics.
Material Options: Carbon steel, stainless steel, and specialty alloys.
Precision Manufacturing: Tight tolerance control for critical applications.
Reliable Performance: Engineered for fatigue resistance and consistent return force.
Material Certification: Verify compliance with required standards (e.g., ASTM, JIS, DIN).
Material Traceability: Assign batch numbers or QR codes for full traceability.
Surface Inspection: Check for defects such as rust, pits, or surface cracks before coiling.
Order Classification: Separate standard and custom orders for optimized production routing.
Capacity Management: Allocate machines based on wire diameter and spring type.
Lead Time Monitoring: Strictly control process lead times to meet delivery schedules.
Machine Calibration: Ensure CNC or mechanical coiling machines are properly set for each batch.
Hook Forming Accuracy: Monitor hook types and angles (e.g., side hooks, crossover hooks).
Spring Index Monitoring: Control the ratio of mean diameter to wire diameter to prevent coiling defects.
Stress Relieving: Perform appropriate heat treatment to eliminate residual stress and improve elasticity.
Temperature Control: Monitor temperature and soaking time to ensure consistent performance.
Batch Separation: Avoid material mix-ups by processing only one batch at a time.
Deburring & Cleaning: Remove sharp edges and foreign particles.
Plating/Coating: Apply zinc plating, powder coating, or black oxide per customer requirements.
Quality Inspection: Test coating thickness and adhesion for durability.
100% Sampling for Critical Specs: Measure free length, hook length, and overall length.
Load Testing: Ensure tension force meets the required specifications at specific elongation.
Fatigue Testing: For high-stress applications, simulate cycles to verify spring endurance.
In-Process Checks: Inspect wire diameter, coil count, and hook shape at each stage.
Final Inspection Report: Include visual checks, load data, and dimension results before packing.
Documentation: Maintain full records for traceability - material certs, inspection reports, and delivery logs.
Tool Life Tracking: Record die and cutter life to prevent dimensional drift.
Routine Maintenance: Schedule preventive maintenance for coiling and forming machines.
Quick Changeover Systems: Reduce downtime when switching between spring types.
Anti-Rust Protection: Use VCI bags, oiling, or rust-proof wrapping based on part requirements.
Impact Prevention: Use foam trays or layered packaging for precision parts.
Inventory Control: Apply FIFO (First-In, First-Out) and maintain batch-level stock records.
Customer Feedback Analysis: Use quality claims and feedback to identify process gaps.
Kaizen Activities: Encourage small daily improvements across production teams.
VAVE Projects: Collaborate with customers on cost reduction and design efficiency.
Use materials with full traceability and batch certificates (chemical + mechanical)
Inspect surface condition before coiling
Ensure coiling machines are properly calibrated before each batch
Monitor spring index and hook forming tooling wear
First-piece inspection for every setup change
Regular sampling during production for:
Dimensions
Load values
Hook alignment
Record all measurements in control charts for traceability
Standardized work instructions for each spring type
Train operators on:
Measuring techniques
Visual defect detection
Machine adjustment protocols
Stress-relieve springs post-coiling to improve stability
Monitor temperature and duration closely
Use one-batch-at-a-time policy to avoid mixing
Inspect coating or plating during and after treatment
Handle parts with gloves or clean tools to avoid contamination
Apply anti-rust oil or use VCI packaging for temporary storage
100% check for:
Visual defects
Hook deformation
Packaging cleanliness
Include inspection records and labels with batch number
Bosswinn is a trusted manufacturer of high-performance tension springs, also known as extension springs, engineered for applications requiring a reliable pulling force or return mechanism. Designed to stretch under load and return to their original shape when the force is released, our springs are built for durability, precision, and consistency across a broad range of industries.
Bosswinn tension springs are integral to many automotive systems:
Seatbelt Retractors: Ensure smooth retraction and safety after use.
Carburetor Linkages: Regulate throttle response and fuel-air mixture.
Brakes & Clutches: Provide essential return forces and tension in actuation systems.
Suspension Components: Applied in motorcycles and specialized vehicles to support mechanical balance.
Robust and dependable, Bosswinn springs enhance performance in:
Garage Door Mechanisms: Deliver balanced lifting and controlled closure.
Construction Machinery: Used in excavators, cranes, and bulldozers to tension control cables and balance components.
Agricultural Equipment: Key to smooth operation in tractors, harvesters, and seeders.
Vibrating Screens & Feeders: Support vibration mechanisms in mining and material sorting.
Power Tools: Enable return actions and controlled motions in drills, sanders, and more.
Robotic Arms: Ideal for dynamic movement and force balancing in automation systems.
Tension springs are widely used in consumer products for functional and comfort-enhancing roles:
Washing Machines: Used in door latches, drum supports, and motor linkages.
Appliances: Integrated in ovens, vacuum cleaners, and other devices for movement control.
Furniture & Upholstery: Provide bounce and support in sofas, chairs, and beds.
Trampolines: Deliver the critical bounce through reliable tensile strength.
Bosswinn tension springs meet the high standards of niche and precision-driven industries:
Aerospace: Applied in landing gear systems, actuated doors, and control surfaces.
Electronics: Enable return motion in components such as keyboard keys and switches.
Defense: Utilized in mechanical systems requiring high reliability under stress.
Medical Devices: Integrated into specialized instruments for controlled force and return.
Leisure Equipment: Found in amusement rides, toys, and sports mechanisms.
Tension springs play critical mechanical roles such as:
Pedal & Lever Return: Ensures pedals or levers return smoothly to rest positions.
Lifting Assistance: Reduces effort in lifting or counterbalancing heavy objects.
Tension Maintenance: Keeps controlled tension in mechanical seals, valves, or rotary shafts (e.g., garter springs).
Zhuji Bosswinn Springs Co., Ltd. is a trusted manufacturer and solutions provider specializing in high-performance spring products and custom-engineered metal components. With a strong foundation in technical expertise and advanced manufacturing, we deliver comprehensive services to meet the diverse needs of global industries.
We produce a wide range of precision springs, tailored to meet exact performance requirements:
Compression Springs - Designed for heavy-duty or precision load-bearing applications.
Tension (Extension) Springs - Engineered for accurate return force and durability.
Torsion Springs - Customized for rotational energy storage and release.
Wave & Disc Springs - For compact applications requiring high force in limited space.
Clip & Form Springs - Precision-formed springs used in assemblies, clamps, and fasteners.
Our in-house CNC machining capabilities allow us to fabricate a variety of high-tolerance components used in:
Automotive parts
Mechanical linkages
Housing & shaft systems
Tooling components
Bosswinn offers metal punching solutions with consistent dimensional accuracy for:
Brackets, washers, and plates
Electronics and appliance fittings
Automotive clips and structural parts
We provide rapid prototyping and technical assistance to help customers:
Optimize spring performance and design
Reduce production costs through VAVE (Value Analysis/Value Engineering)
Shorten lead time for new product development
To enhance product longevity and appearance, we offer:
Zinc plating, powder coating, black oxide, and passivation
Specialized coatings for high-humidity or corrosive environments
With a full suite of inspection tools and systems, we ensure:
Full compliance with customer drawings and tolerances
Material traceability and certification
Fatigue testing, load testing, and dimensional checks
Our packaging is designed for maximum protection and efficiency:
VCI bags, foam wrapping, and customized trays
International shipping support and flexible logistics arrangements
At Bosswinn, we combine engineering precision, manufacturing excellence, and customer-first service to deliver spring and metal solutions that drive performance across industries such as automotive, electronics, machinery, home appliances, and medical devices.
One Partner - Infinite Possibilities. Bosswinn Delivers Strength You Can Trust.
Bosswinn tension springs are made from a wide range of materials depending on the application, including:
High-carbon spring steel (e.g., ASTM A228)
Stainless steel (e.g., SUS304, SUS316) for corrosion resistance
Alloy steel for high-stress environments
Special materials available upon request (e.g., Inconel, phosphor bronze)
Yes. Bosswinn specializes in custom-engineered tension springs based on customer drawings, samples, or performance specifications. We can customize:
Wire diameter
Coil body length
Hook type (German hook, English hook, side hook, extended hook, etc.)
Spring rate and working load
Bosswinn tension springs are widely used in:
Automotive (seatbelts, throttle linkages, brake systems)
Industrial machinery (garage doors, control systems)
Home appliances (washing machines, vacuum cleaners)
Aerospace and medical devices
Agricultural and construction equipment
Lead time depends on order quantity and customization level. General timelines:
Standard designs: 7-10 working days
Custom orders: 2-4 weeks
Expedited service available upon request
Our quality control includes:
Raw material certification and inspection
In-process checks on dimensions and tension force
Final 100% inspection for critical parameters
Optional fatigue or salt spray testing based on application
Yes, Bosswinn offers free or low-cost samples for testing and approval before mass production. For custom parts, tooling fees may apply.
We offer protective packaging to prevent rust and deformation:
VCI bags, PE bags, or anti-rust paper
Foam cushioning or plastic trays for delicate springs
Custom labeling with part numbers and traceability info
Absolutely. Our engineering team can support your design with:
Force calculations
Material selection
Cost reduction suggestions through VAVE (Value Engineering)
Bosswinn complies with international standards and can provide:
ISO 9001 certification
RoHS/REACH compliance
PPAP documentation for automotive customers (upon request)
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