Product Specification

5mm JIS Standard 302 Stainless Steel Spring Wire for Compression, Torsion and Extension Springs

Product Introduction

5mm 302 Stainless Steel Spring Wire is a stainless steel spring wire specified for compression, torsion and extension spring manufacturing.

This product uses AISI 302 stainless steel and has a nominal wire diameter of 5mm. The specification is based on JIS requirements, making the applicable standard an important part of material selection and quality inspection.

With its 5mm diameter, the wire is intended for spring designs requiring a larger wire cross-section than fine-diameter spring wire. The final suitability depends on the spring geometry, required load, working deflection, mechanical properties and operating environment.

For spring manufacturers, selecting 5mm 302 stainless steel wire should therefore involve more than confirming the material grade. Wire diameter, tolerance, tensile strength, temper and surface condition should be specified according to the finished spring design.

Product Specifications

Technical note: Diameter tolerance, tensile strength, temper, surface condition and detailed JIS requirements should be confirmed against the agreed purchase specification before production.

Understanding JIS Standard Spring Wire

For stainless steel spring wire, the material grade and applicable standard should be defined together.

JIS requirements can specify important characteristics such as chemical composition, dimensions and mechanical properties. Therefore, simply identifying a wire as "302 stainless steel" is not sufficient when a project requires compliance with a specific JIS specification.

For a 5mm 302 spring wire order, customers should confirm:

• Applicable JIS standard

• Wire diameter and tolerance

• Tensile-strength requirement

• Temper condition

• Surface condition

• Coil requirements

• Inspection requirements

Using a defined standard provides a measurable basis for production and incoming inspection.

5mm Diameter for Larger Spring Designs

A 5mm wire diameter provides a substantially larger cross-section than fine spring wire such as 0.2mm or 0.32mm.

This makes it suitable for spring designs where the required spring load, mechanical strength or component dimensions call for a larger wire size.

However, a larger diameter does not automatically mean that the wire is suitable for every high-load spring.

The final wire selection should consider:

• Required spring force

• Working deflection

• Mean coil diameter

• Spring index

• Number of active coils

• Operating frequency

• Required service life

• Installation space

• Temperature

• Corrosive environment

AISI 302 Stainless Steel for Spring Applications

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

Its mechanical properties can be developed through cold working. During wire production, the material undergoes controlled deformation to obtain the required mechanical condition.

For spring manufacturing, the final mechanical properties are therefore related to both the stainless steel grade and the processing condition.

This is why the material specification should identify the grade, diameter, applicable standard and required mechanical properties together.

Applications

Compression Springs

5mm 302 stainless steel spring wire can be considered for compression spring designs requiring a larger wire diameter.

Typical design parameters include:

• Wire diameter

• Mean coil diameter

• Free length

• Number of active coils

• Working load

• Working deflection

• Spring rate

The final wire specification should be matched to these design requirements.

Torsion Springs

For torsion springs, the wire experiences twisting around the spring axis.

Important parameters include wire diameter, coil diameter, working angle, leg geometry and operating cycles.

The 5mm wire diameter should therefore be selected according to the torque and geometry required by the finished spring.

Extension Springs

5mm 302 spring wire can also be used for extension springs when the required wire diameter and mechanical properties are compatible with the spring design.

Working load, extension, initial tension and operating cycles should be considered during material selection.

Industrial Wire Forms

Depending on the specified mechanical condition and forming process, 302 stainless steel spring wire can also be considered for larger formed-wire components.

The required temper should be evaluated according to the forming method and finished component geometry.

Product Advantages

5mm Defined Wire Diameter

The 5mm nominal diameter provides a clearly specified wire size for spring designs requiring a larger cross-section.

AISI 302 Stainless Steel

AISI 302 is a commonly used stainless steel grade for spring-wire applications and can be cold-worked to obtain the mechanical condition required for spring production.

JIS-Based Specification

The JIS standard provides a defined technical framework for specifying and inspecting the material.

Suitable for Multiple Spring Types

The product is intended for compression, torsion and extension spring applications, subject to the requirements of the finished spring design.

Specification-Based Quality Control

Important quality parameters can include material grade, wire diameter, dimensional tolerance, tensile strength, temper and surface condition.

This approach provides measurable criteria for production and inspection instead of relying on general claims about product quality.

Quality Control

For 5mm stainless steel spring wire, quality control should focus on measurable characteristics.

Material Verification

The chemical composition should be checked against the specified 302 stainless steel grade and applicable JIS requirement.

Diameter Inspection

The nominal wire diameter is 5.0mm. The required dimensional tolerance should be defined according to the applicable JIS specification or customer drawing.

Mechanical Properties

Tensile strength and other mechanical properties should be tested according to the agreed standard and temper condition.

Surface Inspection

The wire surface should be checked according to the specified surface condition and the requirements of the spring-forming process.

Coil Inspection

Coil dimensions, coil weight and packaging should be inspected according to the order specification.

Where required, inspection documents such as a Mill Test Certificate can be provided according to the agreed requirements.

How to Select 5mm 302 Spring Wire

Step 1: Define the Spring Type

First identify whether the application requires a compression, torsion or extension spring.

Step 2: Determine the Required Load

Calculate the working load and deflection required by the finished spring.

Step 3: Confirm the Wire Diameter

Check whether 5mm wire is compatible with the required spring diameter and available installation space.

Step 4: Define Mechanical Properties

Specify the required tensile strength and temper according to the spring design and applicable JIS specification.

Step 5: Confirm Surface Requirements

Surface requirements should be matched to the wire-forming and spring-coiling process.

Step 6: Evaluate the Service Environment

Temperature, humidity, chemical exposure, working cycles and loading conditions should be considered when selecting the stainless steel grade.

Ordering Information

For a 5mm JIS 302 stainless steel spring wire inquiry, customers should provide:

• Material: AISI 302

• Diameter: 5.0mm

• Applicable JIS standard

• Diameter tolerance

• Required tensile strength

• Temper condition

• Surface condition

• Spring type

• Coil requirements

• Quantity

• Packaging requirements

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

FAQ

What is 5mm 302 stainless steel spring wire used for?

It is specified for compression, torsion and extension spring applications requiring a 5mm stainless steel spring wire.

What standard does this product follow?

The product is specified according to JIS requirements. The exact JIS standard should be confirmed for the specific order.

Why is the 5mm diameter important?

Wire diameter directly affects spring geometry and mechanical behavior. A 5mm wire can be considered for spring designs requiring a larger wire cross-section.

Is 302 stainless steel suitable for spring manufacturing?

AISI 302 is commonly used for stainless steel spring wire. Its final mechanical properties depend on the cold-working and temper condition.

What information should be provided for a quotation?

The recommended information includes material grade, 5mm diameter, applicable JIS standard, tolerance, tensile strength, temper, surface condition, spring type and quantity.

Technical Guide: 5mm Stainless Steel Spring Wire Selection

A spring wire should be selected according to the complete working condition of the finished spring.

A practical selection sequence is:

Spring Type → Working Load → Deflection → Spring Geometry → Wire Diameter → Material Grade → Mechanical Properties → Operating Environment

For a 5mm spring wire, the relatively large wire diameter should be evaluated together with the required coil diameter and spring load.

For repeated-load applications, the spring design should also consider operating cycles and working stress rather than selecting the wire only by nominal diameter.

Related Stainless Steel Spring Wire

Depending on spring design and operating requirements, stainless steel spring wire can be specified in different grades, diameters and mechanical conditions.

Related product categories include:

• 302 stainless steel spring wire

• 304 stainless steel spring wire

• 316 stainless steel spring wire

• JIS stainless steel spring wire

• Large-diameter stainless steel spring wire

• Compression spring wire

• Torsion spring wire

• Extension spring wire

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