Hook Small Tension Spring Extension Tension Spring 0.3/0.4/0.5mm Wire Diameter

Introduction

These small hooked tension springs are precision-made extension springs designed to exert consistent pulling force when stretched. Made from durable spring steel, they feature open loop hooks at both ends for easy attachment. Available in multiple wire diameters, outer diameters, and free lengths, they are suitable for a wide range of light-duty to medium-duty applications, from everyday household items to toys and office equipment.

Specifications

  • Product Name: Hooked Small Tension / Extension Spring
  • Material: Spring steel
  • Wire Diameter: 0.3 mm, 0.4 mm, 0.5 mm (and up to 1.0 mm)
  • Size Format: Wire Diameter × Outer Diameter × Length (e.g., 0.3×3×10 mm)
  • Inner Diameter Formula: Inner Diameter = Outer Diameter − (2 × Wire Diameter)
  • Length Definition: Overall free length including both hooks (natural state, uncompressed/unstretched)
  • Tolerance: ±0.02 mm (manual measurement)
  • Note: Actual product color may vary slightly from the image due to display differences

Features

  1. Durable Spring Steel Construction: Offers consistent elasticity and fatigue resistance for long-term use under repeated stretching.
  2. Integrated Hooked Ends: The open loop hooks provide a simple, reliable way to attach the spring to various components.
  3. Multiple Size Options: Available in various wire gauges, outer diameters, and lengths to match different load and space requirements.
  4. Precision Tolerance: Manufactured to tight tolerances for reliable performance in light to medium-duty applications.

Applications

  • Household Goods: Used in everyday items requiring tension or return mechanisms, such as cabinet doors, lids, and retractable parts.
  • Lighting Fixtures & Electrical Switches: Provides tension for switches, levers, and moving components in lamps and control panels.
  • Electric Vehicles & Equipment: Suitable for light-duty mechanisms in small electric vehicles and appliances.
  • Fitness & Office Equipment: Used in light exercise machines, office furniture, and tools for controlled movement and return action.
  • Toys & Hobby Projects: Ideal for model kits, toys, and DIY projects requiring a small, reliable extension spring.
  • General Light-Duty Tension Applications: Any project needing a small hooked extension spring to provide controlled pulling force.
- Exact dimensions can also be viewed in the photo gallery. 
 
- You can find more products in different material, type, color, sizes, quantity and shapes in our shop If you have special needs, please contact us, we can customize according to your needs!
 
  Note:
- Please allow minor errors due to manual measurement. Thank you for your comprehension.
- Monitors are not calibrated, the element color shown in the photos may differ slightly from the real object. Please take the real one as standard.
 
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