Heavy Extension Springs

Name: China Customized Heavy Extension Springs Manufacturers Suppliers Factory - Made in China - Zhongxin
Brand: Zhongxin
SKU: 308397638

Heavy extension springs are oversized tension elastic parts designed for heavy-load operating conditions, forged with high-strength spring steel to achieve outstanding tensile bearing capacity and anti-fatigue performance.
We produce durable heavy extension springs with wire diameters from 5mm to 20mm and outer diameters ranging 30mm–150mm. Custom free length covers 300mm to 3000mm to fit all kinds of heavy machinery. Strict quenching and tempering procedures ensure every heavy extension springs maintains stable structural rigidity under long-term repeated stretching.

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Product Introduction

Heavy-Duty Performance

Ultra-large tensile load capacity

Thick high-strength alloy steel wire supports thousands of Newtons of tensile force for heavy-duty work.

Reinforced end strength

Heavy-duty end structures including round hooks, flat hooks, lifting rings and fork hooks deliver solid connection and avoid fracture.

Superior fatigue resistance

Raw materials such as 60Si2Mn, 55CrSi and 50CrVA undergo complete thermal processing to extend cyclic service life.

Stable structure

Thick wire coils resist lateral bending during stretching, maintaining consistent working stability.

Surface Protection

Multiple anti-rust solutions are available: plastic coating, electrophoresis, black oxide plus anti-rust oil, effectively preventing rust and extending service life in humid outdoor environments.

Application Fields

Widely applied to lifting machinery, mining equipment, elevators, heavy vehicles, engineering machinery and large industrial facilities under heavy load conditions.

Material & Heat Treatment Advantages

Baoding Zhongxin Spring Manufacturing Co., Ltd. has rich experience in material selection and thermal processing for heavy-duty springs. All heavy extension springs adopt premium alloy spring steel sourced from formal steel mills to control raw material quality from the source. We own dedicated heat treatment equipment and customized quenching & tempering parameters for different materials and sizes to balance strength and toughness. Shot peening strengthening is additionally applied to heavy specification springs to boost surface quality and fatigue resistance. Mature thermal processing technology lays a solid foundation for reliable performance of heavy-load elastic components.

Product Parameter Table

Parameter Item	Value / Range
Wire Diameter Range	5 mm ~ 20 mm
Outer Diameter Range	30 mm ~ 150 mm
Free Length	300 mm ~ 3000 mm (Customizable)
End Hook Types	Round hook, flat hook, lifting ring, fork hook and other heavy-duty ends (Customizable)
Optional Materials	Alloy Spring Steel (60Si2Mn / 55CrSi / 50CrVA)
Surface Treatment	Plastic Coating / Electrophoresis / Black Oxide + Anti-rust Treatment
Customization Mode	Custom design per drawings, samples or heavy-load working conditions
Application Scenarios	Lifting machinery, mining equipment, elevators, heavy vehicles, engineering machinery, large industrial equipment

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