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Custom Extension Spring Manufacturer

Built to deliver reliable tension and controlled extension.

Wire Diameter
0.1 – 80mm
Outer Diameter
1 – 150mm
Free Length
2-600 mm
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Upload a drawing for engineering review. Dimensions are optional when a drawing is provided.

Extension Springs

Extension springs are designed to provide reliable pulling force when extended. With hooks or loops at both ends, these springs are commonly used to connect components, absorb tension, and return assemblies to their original position after the load is released.
Our extension springs can be manufactured with different wire diameters, body diameters, free lengths, hook configurations, spring rates, and material options. They are suitable for machinery, automotive components, agricultural equipment, garage doors, electrical devices, and various industrial applications. For fitness and sports equipment, see our sports and recreation spring solutions.
Each spring is produced according to approved drawings, samples, or technical requirements. From design review and tooling preparation to forming, inspection, and packaging, we maintain careful control throughout the production process. Standard and custom extension springs are available to meet different load, space, and installation requirements.
For a customized quotation, please provide your drawing, sample, dimensions, hook style, working load, extended length, working conditions, and expected quantity. Our team will recommend a suitable extension spring solution for your application.

 

Zinc-plated extension spring with loop ends, its definition, characteristics and typical applications

Spring wire material options: carbon spring wire, music wire, stainless steel 304 and 316, oil tempered, silicon chrome, alloy steel, beryllium copper, phosphor bronze, nickel alloy and titanium alloyCompression springs in increasing sizes showing the 0.1 to 80 mm wire diameter rangeSpring surface treatment options: black oxide, zinc plating, nickel and black nickel plating, Dacromet, electroless nickel, powder coating, phosphating and shot peeningSpring coiling machines and inspection equipment, including a salt spray chamber, spring load testers and a profile projectorNorenSpring production floor: CNC spring coiling lines, coating line and finished-goods warehouse supporting 4,000,000+ springs a monthSpring delivery lead times for standard stock and custom-developed products, with a container ship at sea

REQUEST AN ENGINEERING REVIEW

Start Your Inquiry

Send the drawing you already have.

A PDF, CAD file, sketch or clear reference image is enough to begin an engineering review.

01
GeometryKey dimensions or installation space
02
Working pointRequired load, travel or operating position
03
ConditionsMaterial, temperature or corrosion exposure
04
OrderPrototype or production quantity

No drawing available? Choose Enter Dimensions Manually.

Upload a technical drawing

Dimensions are optional when a drawing is provided.

Your file and project details are used only to review this inquiry.

QUALITY VERIFIED AT EVERY STAGE

Spring load testing equipment operated by a NorenSpring technician
Dimensional inspection with a digital caliper
Dimensional InspectionCritical dimensions checked with calibrated tools.
Material analysis in the NorenSpring laboratory
Material AnalysisMaterial condition and hardness confirmed.
  1. 1

    Drawing Review

    Drawing, load and material reviewed.

  2. 2

    First Article

    Sample dimensions and force verified.

  3. 3

    In-process Inspection

    Critical dimensions checked during production.

  4. 4

    Final Report

    Inspection and traceability records issued.

PREPARED FOR DELIVERY

Protected Packaging

Protected Packaging

Oil paper, VCI bags, bubble film and reinforced cartons.

Custom Crates

Custom Crates

Plywood crates for heavy loads and long-distance shipping.

Palletized & Labelled

Palletized & Labelled

Protected racks and clear labelling organize part number, lot and quantity.

Global Delivery

Global Delivery

Export-ready loads prepared for reliable international logistics.

QUALITY & DOCUMENTS

Material Traceability

Wire identification and material checks from receipt to production.

Inspection

Dimensional, material and load testing with detailed reports.

Certificates

Certificates of Conformance, material certificates and PPAP.

Downloads

Company and product documents in the Download Center.

COMMON QUESTIONS

Answers Before You Ask

Clear answers to common purchasing questions.

Still have questions?
Can you manufacture from my drawing without a standard part number?

Yes. Most of our projects start from a customer drawing or application sketch. We review the geometry, material and performance needs, then confirm manufacturability before quoting.

What is your minimum order quantity?

We support both small-batch prototypes and high-volume production. There is no fixed MOQ — quantities are evaluated based on the spring type, tooling and material requirements.

How do you handle springs for high-temperature or corrosive environments?

We select materials (such as Inconel, stainless steel or special alloys) and surface treatments matched to the operating environment. Our engineers can recommend options based on temperature range, media exposure and cycle life.

What documentation can you provide with production orders?

We supply inspection reports, material certificates, dimensional records and traceability documentation as agreed during project setup. PPAP and FAIR packages are available for automotive and aerospace programs.

What is the expected lead time?

Lead time depends on the spring type, material, tooling, quantity and approval requirements. We confirm the production and sample schedule during quotation.

How are payment and delivery terms confirmed?

Commercial terms, delivery address and documentation requirements are confirmed with the quotation before production starts.

What support is available after delivery?

After-delivery questions can be routed through the project contact for drawing questions, quality documents, repeat orders and application feedback.

Can you provide samples before mass production?

Yes. Prototype and pre-production samples can be arranged for dimensional, load and application approval before the full production order proceeds.

Two ways to start the review

Attach the file you already have, or enter the dimensions you know. Both go to the same engineering team.

Upload PDF / CAD Enter Dimensions