Product Specification

304 Stainless Steel Spring Wire for Precision Spring Forming

Product Introduction

TOPONE supplies 304 stainless steel spring wire for precision spring manufacturing, wire forming and industrial components.

The wire is manufactured from AISI 304 / SUS304 stainless steel and is available in a 0.15–12mm diameter range. Bright and soap-coated surface options are available according to the forming process and application requirements.

304 stainless steel spring wire can be used for compression springs, extension springs, torsion springs, retaining springs and other formed-wire components.

For spring manufacturing, the material grade should be evaluated together with wire diameter, mechanical condition, surface condition, spring geometry, forming process and working environment. Diameter alone should not be used as the only basis for spring wire selection.

Product Specifications

The specific tensile strength, hardness, dimensional tolerance and mechanical condition should be confirmed according to the selected diameter, applicable standard and spring requirements.

Why Choose 304 Stainless Steel Spring Wire?

1. AISI 304 Stainless Steel

AISI 304 / SUS304 is an austenitic stainless steel grade widely used for industrial wire applications.

For spring production, the material selection should consider corrosion exposure, forming requirements, operating temperature and required mechanical properties.

2. 0.15–12mm Diameter Range

TOPONE supplies 304 stainless steel spring wire from 0.15mm to 12mm.

This range covers fine-wire spring requirements as well as larger wire sizes used for industrial spring and wire-forming applications.

The actual diameter should be selected according to spring geometry, required load, deflection, forming equipment and applicable technical specifications.

3. Cold-Drawn Manufacturing Process

The current product specification identifies the manufacturing process as cold drawn.

For spring wire, the manufacturing condition and mechanical properties should be matched to the intended forming process and finished spring requirements.

4. Bright and Soap-Coated Surfaces

Two surface conditions can be selected according to the application:

• Bright surface — suitable when a clean metallic surface is required.
• Soap coated — provides a lubricated surface condition that can be considered for spring coiling and wire forming.

Surface selection should be based on tooling, forming speed, lubrication requirements and finished-part specifications rather than appearance alone.

Applications

Compression Springs

304 stainless steel spring wire can be used for compression spring manufacturing in mechanical assemblies and industrial equipment.

Important specification factors include:

• Wire diameter
• Spring diameter
• Free length
• Number of coils
• Required spring force
• Mechanical condition

Extension Springs

For extension springs, the wire specification should correspond to the required tensile load, working extension and finished spring geometry.

Torsion Springs

304 spring wire can also be formed into torsion springs where the wire is subjected primarily to twisting during operation.

Wire diameter, spring geometry and mechanical properties should be evaluated together.

Wire Form Components

304 stainless steel spring wire can also be used for:

• Retaining springs
• Clips
• Hooks
• Formed-wire components
• Mechanical retaining parts
• Customized wire forms

304 Stainless Steel Spring Wire Selection Guide

Selecting spring wire based only on material grade can result in an unsuitable specification. Buyers should confirm the following parameters.

Material Grade

Confirm whether AISI 304 / SUS304 meets the corrosion and temperature requirements of the application.

Wire Diameter

Select the required diameter within the 0.15–12mm range according to the spring design.

Mechanical Properties

Tensile strength, hardness and spring temper can affect wire forming and finished spring behavior.

If a specific mechanical requirement is needed, provide the target value or applicable material standard.

Surface Condition

Choose bright or soap-coated surface according to the forming equipment and lubrication requirements.

Spring Type

Identify whether the wire will be used for:

• Compression springs
• Extension springs
• Torsion springs
• Retaining springs
• Other wire forms

Applicable Standard

The product can be specified according to relevant ASTM, AISI, DIN, EN, GB or JIS requirements.

Quality & Specification Control

For precision spring wire, quality should be evaluated through measurable technical specifications rather than general descriptions such as “excellent quality.”

Relevant inspection items may include:

• Material grade
• Chemical composition
• Wire diameter
• Diameter tolerance
• Surface condition
• Tensile strength
• Hardness or mechanical condition
• Coil dimensions
• Packaging condition
• Material traceability

For orders with strict dimensional requirements, the customer's technical drawing and applicable material standard should be used as the primary reference.

Custom Stainless Steel Spring Wire

TOPONE can evaluate customized spring wire requirements based on:

• Material grade
• Wire diameter
• Surface condition
• Mechanical properties
• Coil weight
• Packaging
• Applicable standard
• Spring application

For precision spring projects, customers are recommended to provide a technical drawing, spring specification or sample so that the wire diameter, mechanical condition and other parameters can be evaluated together.

Surface Selection

The appropriate surface should be confirmed according to the actual forming process and tooling requirements.

FAQ

What is the diameter range of 304 stainless steel spring wire?

The available diameter range is 0.15–12mm. Specific diameter selection should be based on the spring design and applicable technical specification.

What types of springs can be manufactured from 304 spring wire?

304 stainless steel spring wire can be used for compression springs, extension springs, torsion springs, retaining springs and other formed-wire components, subject to the required mechanical condition and spring design.

What surface finishes are available?

The main surface options are bright and soap coated. The suitable option depends on the forming process, lubrication requirements and final application.

Is 304 stainless steel suitable for precision springs?

304 stainless steel can be considered for precision spring applications when its material characteristics, mechanical condition and wire dimensions meet the requirements of the spring design and working environment.

Can the mechanical properties be customized?

Mechanical properties can be specified according to the applicable standard, wire diameter and customer's technical requirements. The exact target values should be confirmed before production.

What information is needed for a quotation?

The recommended information includes material grade, wire diameter, surface condition, mechanical requirements, spring type, quantity, standard and packaging. A technical drawing is recommended for precision spring applications.

Buyer Specification Checklist

For a technical quotation, buyers can provide: