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China factory - Shenzhen Kemifon Precision Manufacturing Co., Ltd.

Shenzhen Kemifon Precision Manufacturing Co., Ltd.

  • China,Shenzhen ,Guangdong
  • Verified Supplier
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  3. Custom Black Oxide Closed Loop Tension Spring Industrial Extension Spring with
China Custom Black Oxide Closed Loop Tension Spring Industrial Extension Spring with
China Custom Black Oxide Closed Loop Tension Spring Industrial Extension Spring with

  1. China Custom Black Oxide Closed Loop Tension Spring Industrial Extension Spring with
  2. China Custom Black Oxide Closed Loop Tension Spring Industrial Extension Spring with
  3. China Custom Black Oxide Closed Loop Tension Spring Industrial Extension Spring with
  4. China Custom Black Oxide Closed Loop Tension Spring Industrial Extension Spring with

Custom Black Oxide Closed Loop Tension Spring Industrial Extension Spring with

  1. MOQ： 500 Pcs
  2. Price： 0.08 USD
  3. Get Latest Price
Delivery Time 7-20 Days
Payment Terms T/T
Supply Ability 2000000 Pcs / Month
Packaging Details Standard Export Packaging
Model Number KF-CLES-2
Certification ISO 9001
Brand Name KEMIFON
Place of Origin Shenzhen, China

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  1. Product Details
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Product Specification

Delivery Time 7-20 Days Payment Terms T/T
Supply Ability 2000000 Pcs / Month Packaging Details Standard Export Packaging
Model Number KF-CLES-2 Certification ISO 9001
Brand Name KEMIFON Place of Origin Shenzhen, China
Product Description

Our custom closed loop tension springs (also known as closed end extension springs) are precision CNC-machined from high-quality 65Mn or 72A carbon spring steel, with black oxide or electrophoretic coating surface treatment for enhanced corrosion resistance and durability. These industrial extension springs feature closed loop hooks at both ends, providing secure attachment and consistent tension performance in various applications.

As a professional spring manufacturer, we offer OEM and custom services, including production based on your drawings or samples, to meet your exact specifications for wire diameter, outer diameter, total length, coil count, and tension force.

Technical Specification
Product Name: Black Closed Loop Tension Spring
Material: 65Mn / 72A Carbon Spring Steel
Surface Treatment: Black oxide / Electrophoretic coating (black)
Standard Wire Diameter: 1.0 mm (customizable)
Standard Outer Diameter: 10 mm (customizable)
Coil Count & Free Length: Customizable per requirements
Hook Type: Closed loop double hooks
Heat Treatment: Tempering for stress relief and strength
Tolerance: ±0.03 mm for critical dimensions
Applications
  • Industrial machinery and equipment
  • Home appliances and hardware accessories
  • Automotive components
  • Agricultural machinery
  • Door and window hardware
  • Furniture mechanisms
  • General mechanical assemblies
Custom Services
  • OEM and custom orders based on your drawings, samples, or performance specifications
  • Custom dimensions: wire diameter, outer diameter, free length, coil count, hook style
  • Material options: 65Mn, 72A, or other spring steels
  • Surface treatment choices: black oxide, electrophoretic coating, passivation
  • Custom tension force and load requirements
  • Small batch and large production runs are both supported
Product Advantages
  • Precision CNC Machining: Ensures tight tolerance and consistent tension force, eliminating issues like uneven pulling force or hook failure common with low-quality springs.
  • High-Grade Carbon Steel Material: Offers excellent tensile strength and fatigue resistance, preventing permanent deformation or breakage under repeated load cycles.
  • Customizable Design: Our custom service allows you to get springs tailored to your exact dimensions and tension needs, solving compatibility and performance matching problems.
  • Durable Black Oxide/Electrophoretic Coating: Provides superior corrosion resistance and scratch protection, extending service life in various working environments.
  • Stress-Relief Heat Treatment: Eliminates internal stress from forming, ensuring stable performance and preventing early failure during use.
Quality Control
  • Raw material inspection to verify the composition and quality of carbon spring steel wire.
  • Real-time monitoring of CNC forming to ensure hook shape, coil pitch, and dimensional accuracy.
  • Heat treatment verification to confirm proper tempering for strength and stress relief.
  • Deburring and cleaning checks to remove sharp edges and contaminants.
  • Surface treatment inspection to ensure uniform coating coverage and corrosion resistance.
  • Final testing of tension force, free length, and dimensional accuracy for each batch.
FAQ
Can you make custom length tension springs to our specifications? Yes, we offer full custom services and OEM production, including custom length, diameter, tension force, and hook styles based on your drawings or samples.
What material are these closed loop tension springs made of? Our standard models use 65Mn or 72A carbon spring steel, with black oxide or electrophoretic coating. Other materials are available for custom orders.
What is the tolerance for your industrial extension springs? We maintain a tight tolerance of ±0.03 mm for critical dimensions, ensuring consistent fit and performance in your applications.
Can I choose different surface treatments for the tension springs? Yes, we provide multiple surface treatment options including black oxide, electrophoretic coating, and passivation to meet your corrosion resistance and appearance requirements.
What applications are these closed end extension springs suitable for? They are widely used in industrial machinery, home appliances, automotive components, agricultural equipment, door hardware, and furniture mechanisms requiring reliable tension force.

Company Details

Bronze Gleitlager

,

Bronze Sleeve Bushings

 and 

Graphite Plugged Bushings

 from Quality China Factory

  • Business Type:

    Manufacturer,Trading Company,Exporter,Seller

  • Year Established:

    2009

  • Total Annual:

    50000000-60000000

  • Employee Number:

    200~300

  • Ecer Certification：

    Verified Supplier

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Get in touch with us

  • Reach Us
  • Shenzhen Kemifon Precision Manufacturing Co., Ltd.
  • No.A37 Tongxin Road, Tongxin Community, Baolong Subdistrict, Longgang District, Shenzhen City, Guangdong Province, China
  • https://www.kemifon.com/

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