Custom Common Extension Spring

 

Packaging Methods

1. Bulk (Plastic bag)

2. Plastic tray

3. Tape & Reel (For SMT)

What are the common extension springs widely used for? 

Common extension springs are essential for any assembly requiring a reliable return pull action. They are commonly applied in Automotive and Machinery (carburetors, farm machinery), Home Systems (screen door returns, garage door assemblies, washing machine balance systems), and Recreation (trampolines, toys). Additionally, they serve specialized roles in electronic assemblies and capacitive touch button configurations.

FAQ for Common Extension Spring

Q1: How do you determine the optimal initial tension to prevent the extension spring from yielding under high tensile loads?

 A: Properly specifying initial tension is critical to ensuring the spring operates within its safe extended length without permanent deformation. Our engineering team calculates the spring rate relative to your load requirements to maintain the tightly wound helical coil structure even after repeated stretching.

Q2: Why is the hook and loop configuration considered the most sensitive part of the extension spring design?

 A: The ends are critical for attachment and bear the brunt of the pulling force. We carefully design configurations like the Full Loop or Double Twisted Full Loop to minimize stress concentration, ensuring the hook remains secure and does not fatigue prematurely during the pull-back action.

Q3: For electronics and touch applications, how does material selection impact the conductive return pull performance? 

A: While high-carbon steel offers great force, copper alloys like Phosphor Bronze or Beryllium Copper provide superior electrical conductivity and fatigue resistance. These materials are ideal for assemblies requiring both a mechanical return action and a reliable signal path for touch interfaces.

Q4: Can extended hooks be customized to accommodate non-standard mounting distances in specialized machinery? 

A: Yes, we offer Half Hooks, Extended Hooks, and machine-centered loops for unique mounting needs. These custom configurations allow for precise force application in complex assemblies like farm machinery or washing machine balance systems where standard attachment points may not be available.

Q5: What protective measures are taken to ensure the longevity of extension springs in outdoor or humid environments? 

A: We provide professional surface treatments including Nickel, Tin, and Zinc plating to resist environmental oxidation. This anti-corrosion layer ensures that springs used in screen doors or garage assemblies maintain their initial tension and structural integrity over a long service life.