Product Specification

2.3mm 302 Stainless Steel Spring Wire for Compression, Torsion and Extension Springs

Product Introduction

2.3mm 302 Stainless Steel Spring Wire is a hard-temper austenitic stainless steel wire designed for compression, torsion and extension spring manufacturing.

The wire is produced from AISI 302 stainless steel and supplied in a 2.3mm nominal diameter. The available tensile strength for this specification is 1550–1800 N/mm², providing a defined mechanical-property range for spring manufacturing.

The wire can be supplied with either a bright or soap-coated surface, allowing the surface condition to be selected according to the customer's spring coiling and forming process.

For spring applications, wire diameter and tensile strength should be considered together with spring geometry, working load, deflection and operating cycles. A suitable spring wire specification should therefore be selected according to the finished spring design rather than diameter alone.

Product Specifications

Note: The applicable standard and mechanical-property requirements should be confirmed before production. Tensile strength and other inspection requirements should be evaluated against the agreed purchase specification.

2.3mm 302 Spring Wire Mechanical Properties

The specified tensile-strength range for this 2.3mm product is 1550–1800 N/mm².

For stainless steel spring wire, tensile strength is affected by material grade, wire diameter and cold-working condition. Therefore, tensile strength should always be specified together with the wire grade and temper.

For spring manufacturers, the tensile-strength requirement should also be considered alongside:

• Spring wire diameter

• Mean coil diameter

• Spring index

• Working load

• Deflection

• Number of working cycles

• Spring forming process

This provides a more complete basis for selecting spring wire than using tensile strength alone.

Why AISI 302 Is Used for Spring Wire

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

The material can be strengthened through cold working. This is particularly important for spring wire because the final mechanical condition is related to the amount of cold work and specified temper.

The 302 grade is therefore frequently selected when a stainless steel spring wire is required with a defined mechanical-property range.

For applications exposed to specific corrosive environments, however, the material grade should be evaluated according to the actual service conditions rather than selected solely because it is stainless steel.

Bright Surface vs. Soap-Coated Surface

This 2.3mm 302 spring wire can be specified with bright or soap-coated surface treatment.

Bright Surface

A bright surface can be considered when the spring manufacturer requires a cleaner metallic surface appearance or a specific downstream processing condition.

The suitability of a bright finish depends on the spring coiling equipment and subsequent processing requirements.

Soap-Coated Surface

Soap coating provides a lubricated surface condition commonly used for wire feeding and spring coiling.

It can be useful when friction between the wire and forming equipment needs to be controlled during the coiling process.

The appropriate surface should be selected according to:

• Spring coiling equipment

• Wire feeding method

• Forming speed

• Lubrication requirements

• Subsequent cleaning

• Final spring surface requirements

Therefore, bright and soap-coated wire should be treated as different processing options rather than simply different appearances.

Applications

Compression Springs

2.3mm 302 stainless steel spring wire can be used for compression springs designed to resist compressive loading.

The wire diameter and tensile strength should be evaluated together with spring diameter, free length, active coils and working deflection.

Typical applications include mechanical components, industrial equipment, electrical assemblies and general-purpose stainless steel spring components.

Torsion Springs

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

Important design parameters include:

• Wire diameter

• Mean coil diameter

• Number of coils

• Working angle

• Leg configuration

• Operating frequency

The 2.3mm diameter should therefore be selected based on the required torque and spring geometry.

Extension Springs

2.3mm 302 spring wire can also be used for extension springs where the wire is subjected to tensile loading.

Spring design should take into account working load, extension, initial tension and the required number of operating cycles.

Product Advantages

Defined 2.3mm Diameter

The 2.3mm diameter provides a clearly specified wire size for spring manufacturers designing medium-sized spring components.

1550–1800 N/mm² Tensile Strength

The specified tensile-strength range gives customers a measurable mechanical-property requirement for spring-wire selection and incoming inspection.

Hard Temper

The hard condition is intended for spring applications where the wire needs to be supplied with defined cold-worked mechanical properties.

Two Surface Options

Bright and soap-coated surfaces allow the wire specification to be matched to different spring coiling and downstream processing requirements.

Multiple Standards

The product can be specified according to JIS, EN, ASTM, AISI, DIN or GB requirements, subject to confirmation of the exact applicable standard.

Quality Control

For 2.3mm spring wire, quality control should focus on measurable product characteristics.

Material Grade

The chemical composition should be checked against the agreed 302 stainless steel specification.

Diameter

The nominal diameter is 2.3mm. Diameter and tolerance should be verified according to the applicable standard or customer drawing.

Tensile Strength

The specified tensile-strength range is 1550–1800 N/mm². Testing should be performed according to the agreed inspection standard.

Surface Condition

The bright or soap-coated surface should be inspected according to the specified finish and intended forming process.

Coil Condition

Coil dimensions, coil weight and packaging should be checked before shipment.

Where required, inspection documentation such as a Mill Test Certificate can be provided according to the order specification.

How to Select 2.3mm Stainless Steel Spring Wire

Selecting spring wire should begin with the finished spring requirements.

1. Define the Spring Type

Identify whether the application requires compression, torsion or extension springs.

2. Calculate the Required Spring Load

The working load and deflection determine the mechanical requirements of the spring.

3. Check Wire Diameter

The 2.3mm diameter should be evaluated against the required spring diameter and available installation space.

4. Confirm Tensile Strength

The required tensile-strength range should be matched to the spring design and applicable standard.

5. Select the Surface

Choose bright or soap-coated surface according to the spring coiling machine and downstream process.

6. Confirm Operating Conditions

Temperature, corrosion exposure, working cycles and loading conditions should be considered before final material selection.

Ordering Information

When requesting 2.3mm 302 stainless steel spring wire, customers should provide:

• Material grade: 302

• Diameter: 2.3mm

• Tensile strength: 1550–1800 N/mm² or required range

• Temper: Hard

• Surface: Bright or soap-coated

• Applicable standard

• Spring type

• Coil weight

• Quantity

• Packaging requirements

For customized requirements, a spring drawing or basic spring dimensions can help determine the appropriate wire specification.

FAQ

What is 2.3mm 302 stainless steel spring wire used for?

It is designed for compression, torsion and extension spring manufacturing and can also be used for other formed stainless steel wire components.

What tensile strength does the 2.3mm wire have?

The listed tensile-strength range is 1550–1800 N/mm². The final requirement should be confirmed against the applicable standard and purchase specification.

Is the 2.3mm 302 spring wire available with different surfaces?

Yes. The listed surface options are bright and soap-coated.

What is the difference between bright and soap-coated spring wire?

Bright wire provides a bright metallic surface, while soap-coated wire has a lubricated surface condition that can be useful during wire feeding and spring coiling.

Which spring types can be manufactured from this wire?

The product is specified for compression, torsion and extension springs. The final suitability depends on the spring geometry and operating conditions.

Which standards are available?

The product can be specified according to JIS, EN, ASTM, AISI, DIN and GB requirements, subject to confirmation of the applicable specification.

Technical Selection Guide

For a 2.3mm stainless steel spring wire, diameter should not be treated as the only selection parameter.

A practical selection sequence is:

Spring Type → Working Load → Spring Geometry → Wire Diameter → Tensile Strength → Surface Condition → Operating Environment

For example, two springs using the same 2.3mm wire may require different specifications if their working loads, coil diameters or operating cycles are different.

This is why the wire grade, diameter, mechanical properties and surface condition should be specified together when ordering spring wire.

Related Products

For different spring designs, stainless steel spring wire can be supplied in different grades, diameters and surface conditions.

Related options include:

• 302 stainless steel spring wire

• 304 stainless steel spring wire

• 316 stainless steel spring wire

• Bright stainless steel spring wire

• Soap-coated stainless steel spring wire

• Fine-diameter stainless steel spring wire

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