Product Specification

3.0mm 302 Stainless Steel Spring Wire with 1450–1700 N/mm² Tensile Strength

Product Introduction

3.0mm 302 Stainless Steel Spring Wire is a hard-temper stainless steel wire designed for spring manufacturing and formed-wire applications.

The wire is made from AISI 302 stainless steel and supplied in a nominal 3.0mm diameter. The specified tensile strength is 1450–1700 N/mm², providing a defined mechanical-property range for spring wire selection.

For spring manufacturers, a 3.0mm wire diameter can be considered for spring designs requiring a larger wire cross-section than fine-diameter spring wire. The final selection should be based on the complete spring design, including working load, deflection, spring geometry and operating conditions.

The hard condition is an important part of the product specification because spring wire performance depends on the relationship between material grade, cold-working condition and mechanical properties.

Product Specifications

Technical note: Diameter tolerance, surface condition, applicable standard and inspection requirements should be confirmed according to the final purchase specification.

3.0mm Spring Wire and Tensile Strength

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

Tensile strength is one of the important mechanical parameters used when selecting stainless steel spring wire. However, it should not be considered independently.

The actual spring design also depends on:

• Wire diameter

• Mean coil diameter

• Spring index

• Working load

• Working deflection

• Number of active coils

• Operating cycles

• Forming process

• Service temperature

For this reason, the 3.0mm diameter and 1450–1700 N/mm² tensile-strength range should be evaluated together with the finished spring requirements.

AISI 302 Stainless Steel for Spring Wire

AISI 302 is an austenitic chromium-nickel stainless steel grade commonly used for spring wire.

The mechanical properties of stainless steel spring wire are affected by cold working. During wire production, controlled deformation increases the strength of the material and establishes the required mechanical condition.

Therefore, spring wire specifications should identify both the stainless steel grade and the required mechanical properties.

For a 3.0mm 302 spring wire, the hard condition and specified tensile-strength range provide measurable criteria for production and quality inspection.

Why the 3.0mm Diameter Matters

Wire diameter directly influences spring geometry and load characteristics.

A 3.0mm wire is substantially larger than fine spring wire such as 0.2mm or 0.32mm. It can therefore be considered for spring designs where a larger wire cross-section is required.

However, selecting a larger wire diameter does not automatically make it suitable for a higher-load application.

The wire should be evaluated together with the:

Spring Diameter

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

Working Load

The spring must generate the required force within the specified working range.

Deflection

The required working deflection influences the stress level experienced by the spring.

Operating Cycles

For repeatedly loaded springs, the expected number of operating cycles should be considered during material and spring design selection.

Typical Applications

Compression Springs

3.0mm 302 stainless steel spring wire can be used for compression spring manufacturing where the specified wire diameter and tensile-strength range meet the spring design requirements.

Important design parameters include free length, coil diameter, active coils, working load and deflection.

Torsion Springs

For torsion springs, the wire is subjected to twisting during operation.

The selection of 3.0mm wire should consider working angle, coil diameter, leg configuration and required torque.

Extension Springs

3.0mm 302 spring wire can also be considered for extension spring designs.

Working load, extension, initial tension and operating cycles should be evaluated when determining the appropriate wire specification.

Formed Wire Components

Depending on the required mechanical properties and forming process, 302 stainless steel spring wire can also be used for clips, hooks and other formed-wire components.

The supplied temper should be matched to the forming process and final component geometry.

Product Advantages

Defined 3.0mm Diameter

The 3.0mm nominal diameter provides a clearly specified wire size for spring designs requiring a larger wire cross-section.

1450–1700 N/mm² Tensile Strength

The specified tensile-strength range provides a measurable mechanical requirement for material selection and incoming inspection.

Hard Temper

The hard condition is suitable for spring-wire applications where the required mechanical properties are obtained through cold working.

AISI 302 Material

AISI 302 is a commonly used stainless steel grade for spring wire and can be processed to achieve the required mechanical condition.

Specification-Based Selection

The product can be evaluated through measurable parameters including material grade, diameter, tensile strength, temper, surface condition and applicable standard.

This provides a more objective basis for spring-wire selection than general descriptions such as “high quality” or “high performance.”

Quality Control

For 3.0mm spring wire, quality inspection should focus on measurable technical characteristics.

Material Verification

The stainless steel grade should be verified against the applicable material specification.

Diameter Inspection

The nominal diameter is 3.0mm. Diameter and tolerance should be checked according to the agreed standard or customer specification.

Tensile Strength Testing

The specified tensile-strength range is 1450–1700 N/mm². Testing should follow the applicable inspection standard.

Surface Inspection

The wire surface should be checked according to the specified finish and intended spring-forming process.

Coil Inspection

Coil dimensions, coil weight and packaging should be checked according to the agreed order requirements.

Inspection documents such as a Mill Test Certificate can be provided when required by the purchase specification.

How to Select 3.0mm 302 Stainless Steel Spring Wire

1. Start with the Finished Spring

Define the spring type, dimensions and working conditions before selecting the wire.

2. Confirm the Required Load

Determine the required working force and deflection.

3. Check the Wire Diameter

Confirm that 3.0mm wire is compatible with the required coil diameter and available installation space.

4. Define Tensile Strength

Specify the required tensile-strength range according to the spring design and applicable standard.

5. Confirm Temper

The hard condition should be confirmed together with the required mechanical properties.

6. Evaluate Service Conditions

Temperature, corrosion exposure, operating frequency and expected cycles should be considered before final material selection.

Ordering Information

When requesting 3.0mm 302 stainless steel spring wire, customers should provide:

• Material grade: AISI 302

• Diameter: 3.0mm

• Required tensile strength: 1450–1700 N/mm² or specified range

• Temper: Hard

• Diameter tolerance

• Surface condition

• Applicable standard

• Spring type

• Coil requirements

• Quantity

• Packaging requirements

A spring drawing or basic spring dimensions can also help determine whether the selected wire specification is appropriate.

FAQ

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

It can be used for compression, extension and torsion spring manufacturing, as well as selected formed-wire applications.

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

The specified tensile-strength range is 1450–1700 N/mm². The final inspection requirement should be confirmed against the agreed product specification.

What does “Hard” mean for stainless steel spring wire?

Hard refers to the supplied mechanical condition of the wire. Stainless steel spring wire obtains its mechanical properties through controlled cold working and processing.

Is 3.0mm suitable for high-load springs?

A 3.0mm wire can be considered for spring designs requiring a larger wire diameter, but suitability depends on spring geometry, working load, deflection and operating conditions.

What information is needed when ordering this wire?

The key information includes material grade, diameter, tensile strength, temper, tolerance, surface condition, applicable standard, quantity and application.

Technical Guide: 3.0mm Spring Wire Selection

A practical spring-wire selection process is:

Spring Type → Working Load → Deflection → Spring Geometry → Wire Diameter → Tensile Strength → Temper → Operating Conditions

For a 3.0mm 302 spring wire, the specified 1450–1700 N/mm² tensile strength should be evaluated together with the spring geometry rather than treated as an independent performance indicator.

For repeated-load applications, the expected operating cycles and working stress should also be considered during spring design.

Related Stainless Steel Spring Wire

Depending on the required spring dimensions and mechanical properties, stainless steel spring wire can be specified in different grades and diameters.

Related options include:

• 302 stainless steel spring wire

• 304 stainless steel spring wire

• 316 stainless steel spring wire

• Fine-diameter stainless steel spring wire

• Large-diameter stainless steel spring wire

• Compression spring wire

• Torsion spring wire

• Extension spring wire

The final material and mechanical specification should be selected according to the finished spring design and service environment.