Product Specification

302/304 Soap-Coated Stainless Steel Spring Wire 0.15–12mm

Product Introduction

TOPONE 302/304 stainless steel spring wire is a cold-drawn stainless steel wire supplied with a soap-coated surface for spring manufacturing and cold-forming applications.

Available in AISI 302 / SUS 302 and AISI 304 / SUS 304 grades, the wire covers a diameter range of 0.15–12mm for different spring sizes and formed-wire components.

The soap-coated surface provides a lubricated wire condition that can be considered for spring coiling and forming processes where surface lubrication is required.

For spring production, material grade, wire diameter, mechanical condition, surface condition and applicable standard should be selected together according to the finished spring design and manufacturing process.

Product Specifications

Technical Note: Tensile strength, hardness and other mechanical properties should be confirmed according to the selected diameter, mechanical condition and applicable standard. One mechanical specification should not be applied to the complete 0.15–12mm diameter range.

302 and 304 Stainless Steel Spring Wire

SUS 302 Spring Wire

302 stainless steel is commonly specified for spring wire applications where a spring-tempered mechanical condition is required.

For 302 spring wire, the required diameter, temper condition, surface and mechanical properties should be defined according to the spring design and applicable standard.

SUS 304 Spring Wire

304 stainless steel spring wire is another commonly specified option for stainless steel spring and wire-forming applications.

Material selection should consider the working environment, forming requirements and required mechanical condition rather than selecting the grade by name alone.

Choosing Between 302 and 304

The choice between 302 and 304 should be based on the required material specification, spring-forming process, mechanical requirements and service environment.

For precision spring applications, the customer's drawing and applicable material standard should be used as the primary reference.

Soap-Coated Surface

The soap coating provides a lubricated surface condition that can be useful during spring coiling and cold forming.

It can help accommodate processing requirements related to:

• Wire feeding

• Spring coiling

• Forming operations

• Tooling lubrication

• Cold forming processes

The suitable coating condition should be confirmed according to the customer's equipment, tooling and production process.

If a bright metallic surface is required for the finished component, a bright-surface wire specification may be more appropriate.

Product Advantages

302 and 304 Material Options

TOPONE supplies both 302 and 304 stainless steel spring wire, allowing buyers to select the material grade according to the required specification and application.

0.15–12mm Diameter Range

The product is available from 0.15mm to 12mm, covering fine spring wire as well as larger industrial spring applications.

For precision spring production, nominal diameter and diameter tolerance should be specified together.

Soap-Coated Surface

The soap-coated surface provides a lubricated condition for spring coiling and forming processes where surface lubrication is required.

The appropriate coating specification depends on the customer's production equipment and forming process.

Spring-Tempered Condition

Spring-tempered wire can be specified when the finished component requires a defined mechanical condition for spring forming.

The required mechanical properties should be confirmed according to the wire diameter and applicable standard.

Specification-Based Supply

The wire can be specified according to:

• Material grade

• Wire diameter

• Diameter tolerance

• Mechanical condition

• Surface condition

• Applicable standard

• Coil or spool requirements

• Packaging

This approach allows the wire specification to be matched with the actual spring manufacturing process.

Applications

Compression Springs

302/304 stainless steel spring wire can be used for compression spring production where the required material grade, diameter and mechanical condition are properly defined.

Extension Springs

For extension springs, wire selection should consider spring dimensions, forming requirements and the required mechanical condition.

Torsion Springs

Torsion spring production requires the wire specification to be evaluated together with spring geometry, wire diameter and forming process.

Wire Forms

Soap-coated stainless steel wire can also be considered for clips, retaining components and other formed-wire parts when the specified material and mechanical condition meet the application requirements.

How to Select Soap-Coated Stainless Steel Spring Wire?

1. Select the Material Grade

Confirm whether the application requires SUS 302 or SUS 304 according to the applicable material standard.

2. Confirm the Wire Diameter

Select the required wire diameter within the 0.15–12mm range.

For precision components, specify the required diameter tolerance as well.

3. Define the Mechanical Condition

Specify spring temper or another required mechanical condition according to the finished spring design.

4. Confirm the Surface

Soap-coated wire is suitable when a lubricated surface condition is required during spring forming.

If surface appearance is a major requirement, compare the soap-coated specification with a bright-surface option.

5. Confirm the Spring Type

Specify the intended application:

• Compression spring

• Extension spring

• Torsion spring

• Wire form

• Retaining component

• Customized spring component

6. Define the Applicable Standard

Specify the required JIS, ASTM, DIN, EN, GB or customer-specific standard.

Quality & Specification Control

For stainless steel spring wire, product evaluation should be based on measurable technical specifications.

Relevant inspection and control items may include:

• Material grade

• Chemical composition

• Wire diameter

• Diameter tolerance

• Surface condition

• Tensile strength

• Hardness or spring temper

• Coil dimensions

• Packaging

• Material traceability

For precision spring applications, the customer's technical drawing and applicable material standard should be used as the primary reference.

Buyer Specification Checklist

Providing these details helps define the required stainless steel spring wire specification before quotation and production.

FAQ

What is soap-coated stainless steel spring wire?

It is stainless steel spring wire supplied with a soap-coated surface condition. The coating provides lubrication for applications involving spring coiling and cold forming.

What is the diameter range?

TOPONE supplies this product range from 0.15mm to 12mm. The required diameter tolerance should be confirmed according to the application and applicable standard.

Is this wire available in 302 and 304?

Yes. The product can be specified in AISI 302 / SUS 302 or AISI 304 / SUS 304, subject to the required material specification.

Why use a soap-coated surface?

A soap-coated surface provides a lubricated condition that can be considered for wire feeding, spring coiling and cold forming processes.

What types of springs can use this wire?

Typical applications include compression springs, extension springs, torsion springs and other formed-wire components, subject to the required material and mechanical specifications.

What information is needed for an inquiry?

Provide the material grade, wire diameter, tolerance, mechanical condition, surface, applicable standard, quantity, packaging and application. A technical drawing is recommended for precision spring components.

Technical Inquiry

For a 302/304 soap-coated stainless steel spring wire inquiry, please provide:

Grade + Diameter + Temper + Surface + Standard + Quantity + Application

Example:

SUS 304 + 2.0mm + Spring Tempered + Soap Coated + ASTM / Customer Specification + 1,000kg + Compression Spring