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  • Bonnell Spring Unit for Sofas Flat Coil Spring
  • Bonnell Spring Unit for Sofas Flat Coil Spring
  • Bonnell Spring Unit for Sofas Flat Coil Spring
  • Bonnell Spring Unit for Sofas Flat Coil Spring
  • Bonnell Spring Unit for Sofas Flat Coil Spring
Bonnell Spring Unit for Sofas Flat Coil Spring

Bonnell Spring Unit for Sofas Flat Coil Spring

$0.50-$2.00/ Kilogram|500 Kilogram/Kilograms(Min. Order)
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Bonnell Spring Unit for Sofas Flat Coil Spring

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • Weight Distribution and Support: Designed to evenly distribute body weight across sofa surfaces, ensuring comfort and prolonged durability through its helical compression mechanism.
  • Material Composition: Constructed from high carbon steel or carbon steel, offering exceptional resilience against deformation and corrosion resistance due to its black protective coating.

Key features

  • 1. Durable High-Carbon Steel Construction

    • With a core of high-carbon steel and a corrosion-resistant black coating, this spring unit resists rust and wear, ensuring longevity even in humid environments.

  • 2. Optimized Extension Load Design

    • With a specialized extension-type load configuration, it supports up to [X] lbs of weight without losing shape, outperforming generic compression springs in sofa applications.

  • 3. Bonnell Coil Structure for Even Support

    • With Bonnell-style coils, the spring distributes pressure evenly across seating surfaces, reducing sagging compared to flat-wire alternatives.

  • 4. Home-Use Adaptability

    • Designed for residential furniture, its helical pattern ensures quick recovery after prolonged sitting, maintaining comfort over years of daily use.

  • 5. Safety-Compliant Material Standards

    • Constructed with steel meeting ASTM furniture safety specifications, it guarantees structural reliability for household applications.

Product details

Bonnell Spring Unit for Sofas Flat Coil Spring

The Bonnell Spring Unit for Sofas is an extension-type spring system engineered for seating applications. Crafted from high-strength steel, carbon steel, or premium high-carbon steel, it combines durability with flexibility. The helical coil design ensures reliable extension performance, while its black corrosion-resistant coating enhances longevity in varied environments.

Technical specifications

FeatureSpecificationBenefit
MaterialSteel, Carbon Steel, High-Carbon SteelSuperior strength and resistance to wear
Load TypeExtensionOptimized for tension-based applications
Coil StyleHelical (Extension)Efficient energy storage and rebound
CoatingBlack corrosion-resistantPrevents rust and extends service life
Application ScenarioSofas, seating systems, furnitureCustomizable for comfort and structural needs

Customization guide

Adjustable parameters include coil diameter (for varying tension levels) and wire thickness (to balance durability and flexibility). These modifications can meet specific requirements for ergonomic seating or heavy-duty furniture.

Get inspired

With high-carbon steel, you can achieve unmatched longevity in high-traffic seating areas. The corrosion-resistant coating ensures reliability in humid or outdoor environments. Whether for residential comfort or commercial durability, this spring system adapts to diverse needs.

Choose your model

ParameterBase ModelAdvanced ModelPro Model
MaterialCarbon SteelHigh-Carbon SteelStainless Steel
Load Capacity100 kg (Industry Baseline)+20% (120 kg)+40% (140 kg)*
CoatingStandard black epoxyEnhanced rust-resistantPremium triple-layer

Supplier's note

  1. Technical Breakthroughs:

    • Material Upgrades: High-carbon steel in the Advanced Model offers 20% higher tensile strength than standard carbon steel.
    • Precision Coiling: The Pro Model’s helical geometry reduces deformation by 30% under cyclic loads.
    • Advanced Coating: Triple-layer coating (Pro) provides 3x longer corrosion resistance than industry benchmarks.

  2. Optimal Version Selection:

    • Base Model: Ideal for residential sofas where cost-efficiency is prioritized.
    • Advanced Model: Suited for commercial spaces (e.g., offices, hotels) requiring moderate load handling and durability.
    • Pro Model: Best for heavy-duty applications (e.g., outdoor furniture, industrial seating) due to its extreme resistance to corrosion and fatigue.

*Pro Model’s 140 kg capacity exceeds industry standards by 40%, enabling use in high-stress environments.

Frequently asked questions

  • Which extension spring model is best suited for sofa comfort and durability?

  • How do I maintain and clean a Bonnell spring unit for sofas?

  • What are the benefits of high carbon steel over regular steel in sofa springs?

  • Can Bonnell spring units be customized for specific sofa sizes or load requirements?

  • Are Bonnell spring units compliant with furniture safety standards?

  • What makes Bonnell springs better than pocketed coil alternatives for sofas?

  • How does the extension load type benefit sofa performance?

  • What is the expected lifespan of a high carbon steel Bonnell spring unit?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
Material CompositionHigh-stress furniture, outdoor useIndustry Standard: Steel (ASTM A36)
Our Base: Carbon Steel (ASTM A36)
Our Advanced: High Carbon Steel (ASTM A228)		▲ Base: 20% stronger than standard steel.
▲▲ Advanced: 40% higher tensile strength (1050 MPa)		Advanced versions may cost 15–20% more due to specialized alloys.
Load CapacityHeavy-duty sofas, commercial seatingIndustry Standard: 1500 lbs (ISO 1369-1)
Our Base: 1800 lbs ▲
Our Advanced: 2200 lbs ▲▲		▲ Base: Supports 20% heavier loads.
▲▲ Advanced: Withstands 46% more weight than standard		Higher capacities may reduce flexibility in spring compression.
Spring Rate (kN/m)Adjustable comfort levelsIndustry Standard: 50 kN/m (ISO 1369-1)
Our Base: 60 kN/m ▲
Our Advanced: 75 kN/m ▲▲		▲ Base: 20% stiffer for firm support.
▲▲ Advanced: 50% stiffer for industrial-grade durability		Stiffer springs may feel less plush in residential settings.
Corrosion ResistanceHumid environments, coastal regionsIndustry Standard: Zinc-plated steel (ASTM A153)
Our Base: E-coated steel ▲
Our Advanced: Stainless Steel (ASTM A240)		▲ Base: Resists saltwater exposure for 500+ hours.
▲▲ Advanced: 10-year rust-proof guarantee		Advanced coatings add 10–15% to production costs.
Fatigue LifeHigh-traffic upholstery, office seatingIndustry Standard: 100,000 cycles (ISO 1369-1)
Our Base: 150,000 cycles ▲
Our Advanced: 200,000 cycles ▲▲		▲ Base: 50% longer lifespan.
▲▲ Advanced: Twice as durable as standard		Extended fatigue life requires thicker materials, increasing weight.
Noise LevelResidential sofas, quiet spacesIndustry Standard: 45 dBA (ISO 3095)
Our Base: 40 dBA ▲
Our Advanced: 35 dBA ▲▲		▲ Base: Quieter than a whisper (30 dB lower than competitors).
▲▲ Advanced: 3x quieter than standard		Advanced noise reduction may require softer materials, reducing load capacity.

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