Product Specification

302 Stainless Steel Spring Wire with High Tensile Strength | 0.15–12 mm

Product Introduction

302 Stainless Steel Spring Wire is an austenitic stainless steel wire designed for spring manufacturing and other applications requiring a defined combination of wire diameter, material condition, and mechanical properties.

This product is available in a diameter range of 0.15–12 mm. The referenced product specification is 0.85 mm, with a hard condition and a tensile strength of 1850–2150 N/mm² for the specified product condition.

The wire can be supplied with a bright or soap-coated surface according to the required processing method. It is suitable for manufacturing compression springs, torsion springs, extension springs, and selected wire-formed components.

For spring applications, the required tensile strength should always be specified together with the stainless steel grade, wire diameter, material condition, applicable standard, and spring design.

Technical Parameters

The 1850–2150 N/mm² tensile-strength range refers to the referenced product specification and should not be assumed to apply to every diameter or production condition. Actual mechanical properties should be confirmed according to the final grade, diameter, standard, and material condition.

What Is 302 Stainless Steel Spring Wire?

302 stainless steel spring wire is a cold-worked stainless steel wire used for manufacturing springs and other components that require defined mechanical properties.

The wire's suitability for spring production depends on more than the stainless steel grade. The following parameters should be considered together:

• Material grade

• Wire diameter

• Tensile strength

• Material condition

• Surface condition

• Spring geometry

• Forming process

• Operating environment

For this reason, a spring-wire specification should be based on measurable technical requirements rather than general descriptions such as “high strength” alone.

302 Stainless Steel Grade

AISI 302 is an austenitic chromium-nickel stainless steel grade commonly supplied in wire and strip forms.

The product information identifies the 302 composition with approximately 17–19% chromium and 8–10% nickel, with maximum limits specified for carbon, manganese, silicon, phosphorus, sulfur, and nitrogen according to the referenced specification.

For spring-wire procurement, the material grade should be confirmed together with the applicable standard and mechanical condition.

High Tensile Strength for Spring Applications

The referenced 0.85 mm product is specified with a tensile strength of 1850–2150 N/mm².

This value should be treated as a specification for the referenced product condition rather than a universal value for all 302 spring wire sizes.

For different diameters or material conditions, the required tensile strength may differ. Buyers should therefore provide the target diameter, spring type, and applicable standard when requesting a specific mechanical-property range.

For spring manufacturing, important parameters may include:

• Tensile strength

• Wire diameter

• Diameter tolerance

• Material condition

• Surface condition

• Spring index

• Required load

• Working deflection

• Operating temperature

• Service environment

Diameter Range: 0.15–12 mm

The product diameter range is 0.15–12 mm.

The referenced product uses 0.85 mm wire, while other diameters within the available range can be evaluated according to the spring design and manufacturing process.

Diameter selection should consider:

• Spring type

• Required load

• Spring dimensions

• Coil diameter

• Working deflection

• Forming equipment

• Required tensile strength

• Operating conditions

A wire diameter should therefore be selected according to the complete spring specification rather than diameter alone.

Surface Options

Bright Surface

Bright stainless steel wire provides a clean metallic appearance and can be selected when the wire surface is visible or when the subsequent manufacturing process requires a bright wire surface.

Soap-Coated Surface

Soap coating can be used as a processing aid for certain wire-forming operations. The suitable surface condition depends on the forming equipment, drawing or coiling process, and downstream requirements.

The required surface should be confirmed before production because bright and soap-coated wire serve different processing requirements.

Applications

Compression Springs

302 stainless steel spring wire can be used for compression spring manufacturing when the selected wire diameter, tensile strength, material condition, and spring design are compatible.

Typical considerations include spring diameter, free length, working deflection, required load, and operating environment.

Torsion Springs

For torsion springs, the wire undergoes twisting during operation. Wire diameter, material condition, spring geometry, and required mechanical properties should therefore be evaluated together.

Extension Springs

302 spring wire can also be used for extension spring manufacturing. The required wire specification should be determined according to the spring dimensions, load requirements, hook configuration, and working conditions.

Wire-Formed Components

Depending on the wire specification and forming process, 302 spring wire can also be considered for selected formed-wire components requiring a defined hard material condition and mechanical properties.

Product Advantages

Defined 302 Stainless Steel Grade

The product is based on AISI 302 / SUS302 stainless steel, providing a clear material grade for technical procurement.

Hard Spring-Wire Condition

The product is supplied in a hard condition appropriate for spring-wire applications. This differentiates it from annealed stainless steel wire, which is supplied in a softer material condition.

0.15–12 mm Diameter Range

The available diameter range covers fine wire through larger wire sizes for different spring and wire-forming requirements.

High Tensile Strength for Specified Condition

The referenced 0.85 mm product is specified at 1850–2150 N/mm² tensile strength. This value should be confirmed for the specific diameter and material condition required for each order.

Bright and Soap-Coated Options

Different surface options can be selected according to the wire-forming process and downstream application.

Multiple Standards

The product information references JIS, EN, ASTM, AISI, DIN, and GB standards, allowing the wire specification to be aligned with different procurement requirements.

Quality Control

For stainless steel spring wire, quality should be evaluated through measurable parameters relevant to spring manufacturing.

Key inspection items may include:

• Material grade

• Chemical composition

• Wire diameter

• Diameter tolerance

• Tensile strength

• Surface condition

• Material condition

• Coil weight

• Packaging condition

For repeat production, maintaining consistent grade, diameter, material condition, tensile-strength requirements, and inspection criteria provides a clearer basis for controlling product consistency.

How to Select 302 Stainless Steel Spring Wire

A practical selection process is:

Spring Type → Material Grade → Wire Diameter → Material Condition → Tensile Strength → Surface → Spring Geometry → Operating Environment

For example, a 0.85 mm wire used for a small extension spring may have different requirements from a larger-diameter wire used for an industrial compression spring.

The spring type and working conditions should therefore be provided together with the required wire diameter.

302 Spring Wire vs. Annealed Stainless Steel Wire

302 spring wire and annealed stainless steel wire represent different material conditions and should not be treated as interchangeable.

If a manufacturing process requires significant deformation before the final component is produced, the selected material condition should be evaluated against the actual forming process.

Frequently Asked Questions

What is 302 stainless steel spring wire?

302 stainless steel spring wire is stainless steel wire made from AISI 302 / SUS302 and supplied in a defined hard condition for spring manufacturing and selected wire-forming applications.

What diameter range is available?

The specified diameter range is 0.15–12 mm. The referenced product specification is 0.85 mm.

What is the tensile strength of the 0.85 mm wire?

The referenced product specification lists a tensile strength of 1850–2150 N/mm². This value should not be automatically applied to other diameters or material conditions.

Can this wire be used for compression springs?

Yes. Compression springs are one of the listed applications for this 302 spring wire. The final wire specification should be selected according to the spring design and required mechanical properties.

Can it be used for torsion and extension springs?

Yes. The product is listed for compression, torsion, and extension spring applications. The appropriate wire diameter, tensile strength, and material condition depend on the specific spring design.

Is 302 spring wire the same as annealed wire?

No. This product is specified as hard spring wire, while annealed stainless steel wire has a softer material condition. They should be selected according to different manufacturing requirements.

What surface options are available?

The referenced product lists bright and soap-coated surface options. The appropriate surface depends on the forming process and downstream requirements.

Recommended Inquiry Specification

For technical confirmation, buyers can provide:

302 Grade + Wire Diameter + Diameter Tolerance + Tensile Strength + Material Condition + Surface + Spring Type + Standard + Coil Weight

For spring projects, providing the spring type and basic design parameters allows the wire specification to be evaluated more accurately.