Tension Spring

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Tension Spring

Tension Spring

Heavy-Duty & Long-lasting Extension Springs

Extension springs, also known as closed coil helical springs, have both ends attached to different components. When an external force is applied, causing the components to move apart, these springs exert force to return the components to their original position. This characteristic makes them ideal for applications requiring tension or expansion. HSI offers high-quality extension springs designed for durability and longevity.

HSI provides extension springs with various capabilities, including:

Ends: Our extension springs are available with different end types, such as full-loop and machine-made loop configurations. The loops or hooks may feature a crossway center transition of the previous coil before forming the loop or hook.

Tolerances: The tolerance of an extension spring depends on its wire diameter and body diameter. Actual tolerance values are determined by the specifications of the tension helical springs, typically ranging between +/-10% and +/-5%.

Specifications of Extension Springs

The extension springs available with us have the following specifications:

Diameter0.02 to 16.00 in0.5 to 406.4 mm
Free Length0.19 to 120.00 inch5.0 to 3048 mm
Wire Size.004 to 1 in0.1 to 25.4 mm
Direction of WindingRight HandLeft HandOptional
Loop TypesMachine HooksExtendedSingle Full Loop
Side HooksCross OverDouble Full Loop
MaterialBeryllium CopperMusic WireInconel
Chrome SiliconChromium VanadiumPhosphor Bronze
Stainless Steel 302Stainless Steel 304Stainless Steel 316
FinishPlainBlack OxidePainted
CadmiumPassivateZinc Gold
Zinc SilverGold Irridite


Capabilities of Extension Springs

We provide extension springs of the following capabilities:

  • Ends: The different end types of extension springs provided by HSI are full-loop and machine-made loop configurations. The loops or hooks may have crossways center transition of the previous coil, before creating a loop or hook.
  • Tolerances: The tolerance of an extension spring depends on its wire diameter and the body diameter. Actual values of tolerances depend on the specifications of these tension helical springs. Generally, the tolerance range of these springs varies between +/-10% and +/-5%.

Types of Extension Springs

We offer a range of mechanical extension springs, including:

  • Continuous Length Extension Springs
  • Heavy Duty Extension Springs
  • Round Wire Extension Springs
  • High-Performance Extension Springs
  • Extension Spring End Types

Extension Spring End Types

There are several end types of an extension spring. Here are some end types:

Machine Cut Plain Ends

Machine Cut Plain Ends
Single Full Loop Over CenterSingle Full Loop Over Center
Small Offset Hook at the SideSmall Off set Hook at Side
Machine Half Hook Over CenterMachine Half Hook Over Center
Double Full Loop Over CenterDouble Full Loop Over Center
Coned End With Swivel BoltsConed End With Swivel Bolts
Half Loop Over CenterHalf Loop Over Center
Full Loop at SideFull Loop at Side
Coned End With Swivel HookConed End With Swivel Hook
Long Round End Hook Over CenterLong Round End Hook Over Center
Small Eye at the SideSmall Eye at Side
Threaded Plug to Fit Plain End SpringThreaded Plug to Fit Plain End Spring
Y - Hook Over CenterY - Hook Over Center
Extended Eye Over CenterExtended Eye Over Center
Drawbar SpringDrawbar Spring


Extension Spring Shape Types

Extension springs can be designed in various shapes, such as:

  • Conical
  • Barrel
  • Helical
  • Oval
  • Cylindrical

Extension springs can feature various end types to suit different applications.

Extension springs find applications in diverse industries, including:

  • Garage Doors
  • Electronic Components and Switches
  • Automobile Component Manufacturing
  • Hydraulic and Pneumatic Systems
  • Oil and Mechanical Seals
  • Extension Spring Shape Types

Extension springs can be designed in various shapes to accommodate specific requirements, including conical, barrel, helical, oval, and cylindrical shapes.

The extensive stock of extension springs in our catalog enables you to choose the right type for your application. For more information about our extension springs and other products, please contact us at sales@hariomespring.com.

About Us

Welcome to Hariome Spring Industries, a premier destination for top-quality springs in India. Established in 1989, we have been at the forefront of spring manufacturing, offering a comprehensive range of heavy-duty springs, wire springs, strip springs, and wire forms to meet diverse industrial needs.

Driven by a commitment to innovation and excellence, we prioritize technological advancements, continuous improvement, and unwavering dedication to quality. Our experienced and skilled production team ensures the fabrication of superior-quality springs, continually enhancing our manufacturing processes to meet evolving standards.

At Hariome Spring Industries, we boast a wide manufacturing range, capable of producing wire springs ranging from 0.1mm to 40mm. Our extensive product lineup includes compression springs, tension springs, torsion springs, back rod springs, extension springs, taper springs, flexible springs, hook springs, bevel springs, conical springs, Belleville springs, R clips, C clips, metal stamping springs, spring washers, wire forms, and more. Additionally, we offer customized spring solutions tailored to our customers' specific requirements.

Experience reliability, precision, and excellence with Hariome Spring Industries – your trusted partner for premium-quality springs in India.

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