Product Specification

3.0mm 302 Stainless Steel Spring Wire for High-Load Forming

Product Introduction

3.0mm 302 Stainless Steel Spring Wire is a hard-temper stainless steel wire designed for spring manufacturing, wire forming and industrial components requiring a defined diameter and controlled tensile strength.

Made from AISI 302 / SUS302 stainless steel, this product has a nominal diameter of 3.0mm and a specified tensile strength of 1450–1700 N/mm².

The wire is available with different surface conditions according to production requirements, including bright and soap-coated options.

The wider stainless steel spring wire range is 0.15–12mm, allowing manufacturers to select different diameters according to spring geometry, working load, forming equipment and application requirements.

For spring manufacturing, wire diameter and tensile strength should be evaluated together with spring dimensions, working deflection, forming process and service environment.

Product Specifications

Note: The 1450–1700 N/mm² tensile strength range applies to this specified 3.0mm hard-temper configuration. Other diameters and temper conditions may have different mechanical properties and should be confirmed according to the applicable specification.

AISI 302 Stainless Steel for Spring Manufacturing

AISI 302 is an austenitic stainless steel grade commonly used for stainless steel spring wire and cold wire-forming applications.

The mechanical condition of spring wire is influenced by cold working during production. For this reason, the material grade should be specified together with the required tensile strength or temper condition.

For the 3.0mm hard-temper wire, the specified tensile strength of 1450–1700 N/mm² provides a measurable reference for material selection and quality inspection.

When evaluating the wire for a specific spring, buyers should also consider:

• Wire diameter

• Tensile strength

• Spring diameter

• Working load

• Working deflection

• Number of active coils

• Forming equipment

• Operating environment

3.0mm Diameter for Spring Design

The 3.0mm wire diameter provides a larger cross-section than fine spring wire and can be considered for spring designs requiring this specific wire size.

Wire diameter directly affects spring geometry and should be selected together with the required spring dimensions.

For engineering evaluation, manufacturers should consider:

Spring Diameter

The mean coil diameter should be compatible with the selected wire diameter and required spring geometry.

Working Load

The spring design should be evaluated against the required working force and operating range.

Working Deflection

Required deflection affects the stress experienced by the finished spring and should be considered during material and spring design.

Operating Cycles

For repeatedly loaded springs, the expected number of operating cycles should be considered when selecting the wire specification and designing the finished spring.

Hard Temper and Tensile Strength

This product is supplied in hard temper with a specified tensile strength of 1450–1700 N/mm².

The tensile strength provides a measurable parameter for comparing the supplied wire with the customer's technical specification.

However, tensile strength should not be considered independently when selecting spring wire.

The final application also depends on:

• Wire diameter

• Spring geometry

• Forming process

• Working load

• Deflection

• Operating cycles

• Service temperature

• Service environment

For customized orders, the required tensile strength or mechanical condition should be confirmed before production.

Bright and Soap-Coated Surface Options

Bright Surface

Bright stainless steel spring wire provides a clean metallic surface and can be selected for applications where surface appearance and condition are important.

Soap-Coated Surface

Soap-coated wire can be considered for spring-forming processes where the surface condition and lubrication characteristics are suitable for the customer's forming equipment.

The appropriate surface should be selected according to:

• Wire feeding system

• Forming equipment

• Tooling

• Lubrication requirements

• Forming speed

• Subsequent processing

0.15–12mm Stainless Steel Spring Wire Range

TOPONE supplies stainless steel spring wire in diameters from 0.15–12mm.

The 3.0mm specification is one option within this product range.

These are general application references. The final diameter should be determined according to the finished spring drawing, required load and forming process.

Applications

Compression Springs

3.0mm 302 stainless steel spring wire can be considered for compression spring manufacturing where the specified diameter and hard-temper condition match the spring design.

Important design parameters include:

• Spring diameter

• Free length

• Working load

• Working deflection

• Number of active coils

Extension Springs

The wire can also be evaluated for extension spring production when the specified diameter, tensile strength and forming process are suitable for the required design.

Torsion Springs

For torsion spring applications, wire diameter, coil diameter, working angle and mechanical condition should be evaluated together.

Industrial Wire Forms

The 3.0mm wire can also be used for selected formed-wire components such as:

• Clips

• Hooks

• Retaining components

• Brackets

• Wire forms

• Industrial hardware

The forming process should be matched with the hard-temper condition and specified tensile strength.

Product Advantages

Defined 3.0mm Diameter

The 3.0mm nominal diameter provides a clear specification for spring design and industrial wire-forming applications.

Hard Temper

The hard condition provides a defined mechanical state for applications requiring the specified tensile strength range.

1450–1700 N/mm² Tensile Strength

The specified tensile strength range provides a measurable parameter for material selection and incoming inspection.

AISI 302 Stainless Steel

AISI 302 is a commonly used stainless steel grade for spring wire and cold wire-forming applications.

Bright and Soap-Coated Options

Different surface conditions can be selected according to the forming equipment, lubrication requirements and subsequent processing.

0.15–12mm Product Range

The wider diameter range allows manufacturers to select different wire sizes according to spring geometry and component requirements.

Quality Control and Inspection

For stainless steel spring wire, product quality should be evaluated using measurable technical parameters.

Depending on the purchase specification, inspection can include:

Material Verification

Chemical composition can be checked against the specified AISI 302 stainless steel grade.

Diameter Inspection

Wire diameter and dimensional tolerance can be inspected according to the agreed specification.

Tensile Strength Testing

The specified tensile strength for this 3.0mm hard-temper product is 1450–1700 N/mm².

Testing can be performed according to the applicable product standard and purchase specification.

Surface Inspection

The wire surface can be inspected according to the agreed bright or soap-coated surface condition.

Coil and Packaging Inspection

Coil weight, spool specifications and packaging can be checked according to customer requirements.

Documentation

Material Test Certificates and inspection documents can be provided when required by the purchase specification.

Applicable Standards

ASTM A313/A313M is a key reference standard for stainless steel round spring wire intended for spring manufacturing. The standard covers requirements including chemical composition and tensile strength, with mechanical tests such as wrap, coil uniformity and bend tests specified within the standard.

Depending on the customer's market and technical requirements, specifications can also reference:

• AISI

• EN

• DIN

• JIS

• GB

• Equivalent customer specifications

The exact standard, diameter tolerance, tensile strength, surface condition and inspection requirements should be confirmed before production.

How to Select 3.0mm 302 Stainless Steel Spring Wire

Selecting spring wire should start from the finished component requirements rather than diameter alone.

Step 1: Define the Spring Type

Determine whether the application requires a compression, extension, torsion or another type of spring.

Step 2: Confirm the Wire Diameter

Confirm whether 3.0mm matches the required spring geometry and available forming equipment.

Step 3: Define the Mechanical Condition

Confirm the required tensile strength or temper according to the spring design.

For this product, the specified hard-temper tensile strength is 1450–1700 N/mm².

Step 4: Confirm the Surface

Select bright or soap-coated surface according to the wire feeding system, forming equipment and subsequent processing.

Step 5: Confirm the Standard

Specify the required ASTM, EN, DIN, JIS or other applicable standard.

Step 6: Confirm Packaging

For automated production, confirm coil weight, spool dimensions and unwinding requirements before ordering.

Ordering Information

For a 3.0mm 302 stainless steel spring wire inquiry, buyers are recommended to provide:

• Material Grade: AISI 302

• Diameter: 3.0mm

• Temper: Hard

• Tensile Strength: 1450–1700 N/mm²

• Surface: Bright / Soap Coated

• Applicable Standard

• Quantity

• Coil or Spool Requirement

• Packaging Requirement

• Application or Spring Type

Providing a spring drawing or component specification can help determine whether the selected wire condition is suitable for the intended manufacturing process.

Frequently Asked Questions

What is 3.0mm 302 stainless steel spring wire used for?

It can be used for compression springs, extension springs, torsion springs and selected industrial wire-forming components.

What is the tensile strength of this 3.0mm spring wire?

The specified tensile strength for this hard-temper configuration is 1450–1700 N/mm².

What does hard temper mean?

Hard temper indicates a defined cold-worked mechanical condition of the spring wire. The exact mechanical properties should be specified according to the applicable standard and purchase requirements.

Is AISI 302 suitable for spring manufacturing?

AISI 302 is commonly used for stainless steel spring wire. Final suitability depends on the wire diameter, mechanical condition, spring design and operating requirements.

What diameter range is available?

The stainless steel spring wire product range is 0.15–12mm. The nominal diameter of this product is 3.0mm.

Can the surface finish be customized?

Bright and soap-coated surface options can be selected according to the application and forming process.

Can the wire be supplied in coils or spools?

Yes. Coil or spool supply can be specified according to the wire diameter, production equipment and customer handling requirements.

Technical Inquiry

For a 3.0mm 302 stainless steel spring wire inquiry, please provide:

Material Grade + Diameter + Temper + Tensile Strength + Surface + Standard + Quantity

For spring manufacturing projects, providing the spring drawing, working load or basic component dimensions can help determine the appropriate wire specification.