Product Specification

304 Stainless Steel Spring Wire for Precision Springs

Product Introduction

TOPONE 304 stainless steel spring wire is designed for precision spring manufacturing, wire forming, and industrial components where material grade, wire diameter, and mechanical condition need to be controlled according to the finished spring design.

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

For precision spring production, wire diameter should not be considered separately from spring geometry, required load, forming process, mechanical properties, surface condition, and working environment.

Product Specifications

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

Why Choose 304 Stainless Steel Spring Wire?

AISI 304 / SUS 304 Material

304 is an austenitic stainless steel grade commonly used for industrial wire and spring applications.

For spring production, material selection should consider the actual corrosion environment, operating temperature, forming requirements, and required mechanical properties rather than relying on the grade name alone.

0.15–12mm Diameter Range

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

This range covers fine spring wire as well as larger wire sizes used for industrial springs and formed-wire components.

For precision springs, the required diameter tolerance should also be specified because dimensional variation can affect the finished spring geometry and assembly.

Cold-Drawn Manufacturing

The product is specified as cold-drawn round wire.

The drawing condition influences the final mechanical condition of the wire. For spring manufacturing, the required tensile strength, hardness, spring temper, and forming requirements should therefore be confirmed before production.

Bright and Soap-Coated Surfaces

Two main surface options are available:

• Bright surface: suitable when a clean metallic surface is required.

• Soap-coated surface: provides a lubricated condition that can be considered for spring coiling and other forming processes.

Surface selection should be based on tooling, forming equipment, lubrication requirements, and final-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 parameters include:

• Wire diameter

• Mean spring diameter

• Free length

• Number of active coils

• Required spring force

• Mechanical condition

Extension Springs

For extension springs, the wire specification should match the required tensile load, working extension, spring geometry, and forming process.

Torsion Springs

304 spring wire can also be formed into torsion springs.

Wire diameter, spring geometry, spring temper, and mechanical properties should be evaluated together when specifying the material.

Precision Wire Forms

The wire can also be used for clips, hooks, retaining components, formed-wire parts, and other customized wire forms.

Precision Spring Wire Selection Guide

1. Confirm the Material Grade

Specify AISI 304 / SUS 304 or the required equivalent designation.

Check whether the material is suitable for the actual working environment and corrosion exposure.

2. Confirm the Wire Diameter

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

For precision spring applications, specify the required diameter tolerance according to the drawing or applicable standard.

3. Confirm Mechanical Properties

Spring wire selection should include the required:

• Tensile strength

• Hardness

• Spring temper

• Elongation where applicable

The exact values should be based on the spring design, wire diameter, applicable standard, and forming process.

4. Select the Surface Condition

Choose bright or soap-coated wire according to the production process.

Soap-coated wire can be considered when the spring coiling process requires additional surface lubrication.

5. Confirm the Spring Type

Specify whether the wire will be used for:

• Compression springs

• Extension springs

• Torsion springs

• Retaining springs

• Clips

• Other wire forms

6. Provide the Spring Drawing

For precision spring projects, a technical drawing or sample is recommended.

Useful information includes wire diameter, spring diameter, free length, number of coils, working load, operating temperature, and required service conditions.

Quality & Specification Control

For precision spring wire, quality should be evaluated through measurable specifications rather than general descriptions.

Relevant inspection items may include:

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

Bright vs. Soap-Coated Spring Wire

Surface choice should be determined by the actual tooling and production process.

A bright surface should not automatically be treated as a better option than soap coating; the two surfaces serve different processing requirements.

Customized 304 Spring Wire

TOPONE can evaluate customized spring wire requirements based on:

• Material grade

• Wire diameter

• Diameter tolerance

• Surface condition

• Mechanical properties

• Spring temper

• Coil weight

• Packaging

• Applicable standard

• Spring application

For precision spring projects, providing the finished spring drawing or technical specification allows the wire diameter and mechanical condition to be evaluated together.

FAQ

What is 304 stainless steel spring wire?

304 stainless steel spring wire is cold-drawn stainless steel wire made from AISI 304 / SUS 304 and used for spring manufacturing and wire-forming applications.

What is the diameter range?

The current TOPONE range is 0.15–12mm. The exact diameter and tolerance should be confirmed according to the spring design and applicable specification.

What springs can be manufactured from 304 wire?

304 stainless steel spring wire can be used for compression springs, extension springs, torsion springs, retaining springs, and various formed-wire components when the mechanical condition matches the application.

What surface options are available?

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

Is 304 suitable for precision springs?

304 can be considered for precision spring applications when the material grade, wire diameter, mechanical properties, surface condition, and spring design meet the required specification.

Can mechanical properties be customized?

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

What information is needed for a quotation?

Provide the material grade, wire diameter, tolerance, surface condition, mechanical requirements, spring type, quantity, applicable standard, and packaging requirements.

For precision applications, a spring drawing or sample is recommended.

Buyer Specification Checklist