Product Specification

0.35mm 302 Stainless Steel Spring Wire for Precision Spring Applications

Product Introduction

0.35mm 302 Stainless Steel Spring Wire is designed for manufacturers producing small springs, wire forms, screws, clips, hooks, and other precision components requiring stainless steel spring wire.

Made from AISI 302 stainless steel, this wire is suitable for applications where spring properties, corrosion resistance, and controlled wire dimensions are important considerations.

The featured diameter is 0.35mm, with a broader stainless steel spring wire range available according to material grade, diameter, surface condition, mechanical properties, and application requirements.

The wire can be supplied in different conditions, including hard or softer conditions, depending on the required forming process and final component design.

Product Specifications

Diameter tolerance, tensile strength, hardness, elongation and other mechanical properties should be confirmed according to the required wire condition and applicable standard.

Why Choose 302 Stainless Steel Spring Wire?

1. AISI 302 Stainless Steel

AISI 302 is an austenitic stainless steel grade commonly used for spring wire and other cold-worked components.

Its material characteristics make it suitable for applications where the finished component requires a combination of spring properties and resistance to normal atmospheric or moisture exposure.

For highly corrosive environments, particularly those involving significant chloride exposure, the stainless steel grade should be evaluated according to the actual service conditions.

2. 0.35mm Diameter for Fine Spring Components

The 0.35mm diameter makes this product suitable for relatively small springs and precision wire components.

When selecting fine spring wire, diameter alone is not sufficient. Manufacturers should also consider:

• Spring design

• Wire condition

• Required spring rate

• Working stress

• Number of cycles

• Forming method

• Operating temperature

• Corrosion environment

The final wire specification should therefore be matched to the actual spring design and working conditions.

3. Hard and Soft Conditions

Different spring and wire-forming processes may require different wire conditions.

Hard condition can be considered where the finished component requires the mechanical characteristics associated with harder spring wire.

Softer condition can be considered where additional forming or bending is required before the final component reaches its required condition.

The appropriate condition depends on the forming method, component geometry, required mechanical properties, and subsequent heat treatment or processing.

4. Bright and Soap-Coated Surfaces

The wire can be supplied with different surface conditions according to the intended processing method.

Bright surface is suitable for applications where a clean metallic appearance is required or where the wire is used in a finished visible component.

Soap-coated surface can be considered for wire forming processes where lubrication is required during subsequent processing.

The surface should be selected together with the forming process rather than treated as an independent specification.

Typical Applications

Precision Springs

0.35mm 302 stainless steel spring wire can be used for manufacturing:

• Compression springs

• Extension springs

• Torsion springs

• Small wire springs

• Precision springs

• Custom spring components

The suitability of the wire should be evaluated according to spring dimensions, working load, operating cycles, and service environment.

Wire Forms

The wire can also be processed into:

• Clips

• Hooks

• Retaining components

• Small brackets

• Wire forms

• Fastening components

Small Hardware Components

Depending on the design and forming process, 0.35mm stainless steel wire can also be considered for small screws, pins, hooks, and other formed metal components.

Hard vs. Soft Wire Selection

Wire condition is an important parameter when selecting 302 stainless steel spring wire.

The terms “hard” and “soft” should not be treated as universal specifications. The actual tensile strength, hardness, elongation, and other properties should be confirmed for the selected delivery condition.

Surface Selection Guide

Bright Surface

Choose a bright surface when:

• The wire remains visible in the finished component

• Surface appearance is important

• The production process does not require additional lubrication

Soap-Coated Surface

A soap-coated surface may be suitable when:

• The wire undergoes further forming

• Lubrication is required during processing

• The production line uses a specific wire-feeding or forming process

The suitable surface condition should be confirmed with the forming equipment and production method.

How to Select 0.35mm Spring Wire?

For small spring applications, buyers should evaluate more than material and diameter.

1. Material Grade

Confirm whether AISI 302 meets the required corrosion and mechanical performance for the service environment.

2. Wire Diameter

For this product, the featured diameter is 0.35mm. Diameter tolerance should be specified according to the spring design and production equipment.

3. Wire Condition

Select the appropriate hard or softer condition according to the forming process and required mechanical properties.

4. Surface Condition

Bright and soap-coated surfaces should be selected according to the subsequent forming process and finished-product requirements.

5. Spring Design

For spring production, provide parameters such as:

• Spring type

• Wire diameter

• Mean coil diameter

• Free length

• Number of active coils

• Working load

• Working deflection

• Required cycle life

• Operating temperature

These parameters help determine whether the selected 302 stainless steel spring wire is suitable for the intended application.

Quality Control

For precision stainless steel spring wire, quality should be evaluated through measurable specifications.

Key inspection items include:

• Material grade

• Chemical composition

• Wire diameter

• Diameter tolerance

• Surface condition

• Tensile strength

• Hardness

• Elongation

• Coil dimensions

• Packing condition

• Batch identification

• Applicable standard

For customized orders, customers can provide their required wire diameter, material grade, mechanical properties, surface condition, spring application, and packing requirements.

Packing & Supply

The 0.35mm 302 stainless steel spring wire can be supplied in coils or spools according to the customer's production equipment and handling requirements.

For automated spring production, spool dimensions, coil weight, winding configuration, and wire-feeding requirements can be discussed before production.

The minimum order quantity, packing weight, delivery schedule, and other commercial specifications should be confirmed according to the individual order.

FAQ

What is 0.35mm 302 stainless steel spring wire?

It is AISI 302 stainless steel wire with a featured diameter of 0.35mm, designed for small springs, wire forms, clips, hooks, and other precision components.

Is 302 stainless steel suitable for springs?

Yes. AISI 302 is commonly used for stainless steel spring wire. The appropriate wire condition and mechanical properties should be selected according to the spring design and working conditions.

What spring types can use 0.35mm wire?

Depending on the design and required mechanical properties, 0.35mm wire can be considered for compression, extension, torsion, and other small spring configurations.

Is hard or soft wire better?

Neither is universally better. The choice depends on the forming process, required mechanical properties, spring design, and subsequent processing requirements.

What surface finishes are available?

Bright and soap-coated surface conditions can be supplied according to the application and subsequent wire-forming process.

Can the 0.35mm wire be customized?

Yes. Diameter tolerance, wire condition, surface, mechanical properties, packing, and applicable standards can be specified according to the customer's requirements.