Product Specification

0.7mm 302 Stainless Steel Spring Wire, Soap Coated

Product Introduction

TOPONE Wire supplies 302 stainless steel spring wire in diameters from 0.15–12 mm, including the 0.70 mm specification shown on this page.

AISI 302 is an austenitic chromium-nickel stainless steel commonly used for spring wire. Through cold working and controlled drawing, the wire can achieve the mechanical properties required for spring manufacturing.

This 0.70 mm spring wire is supplied in a hard / spring temper with a soap-coated surface. The combination is commonly selected for compression springs, extension springs, torsion springs, and other formed wire components where wire diameter, tensile strength, surface condition, and forming requirements need to be considered together.

The specified tensile strength for this product is 1850–2150 N/mm². The final mechanical-property requirement should be confirmed according to the applicable standard and agreed purchase specification.

Product Specifications

*Mechanical properties should be confirmed against the applicable standard, diameter, temper and agreed production specification.

Why 302 Stainless Steel Is Used for Spring Wire

AISI 302 is an austenitic stainless steel grade based on a chromium-nickel alloy system. It is widely used for stainless steel spring wire because its mechanical properties can be developed through cold working.

For spring manufacturing, material grade alone does not determine the final performance of the wire. The following parameters should be considered together:

• Wire diameter

• Cold-working condition

• Tensile strength

• Spring temper

• Spring geometry

• Working load

• Operating temperature

• Corrosion environment

• Required service cycles

For this reason, spring wire should be selected according to the actual spring design and production process rather than material grade alone.

Soap-Coated Stainless Steel Spring Wire

The soap-coated surface is designed for applications where surface lubrication is required during wire processing.

During spring coiling and wire forming, the surface condition of the wire can influence friction between the wire and forming equipment. A suitable soap coating can support wire feeding and forming operations.

The appropriate surface treatment depends on:

• Spring coiling equipment

• Wire feeding method

• Forming speed

• Lubricant compatibility

• Required surface cleanliness

• Subsequent cleaning or coating

• Final spring application

For automated spring production, the surface specification should therefore be confirmed together with the forming process.

0.7mm Spring Wire for Spring Manufacturing

The 0.70 mm diameter is a defined fine-to-medium wire size for spring manufacturing and wire forming.

The actual suitability of 0.7mm wire depends on the spring design. Important design parameters include:

• Mean coil diameter

• Wire diameter

• Spring index

• Number of active coils

• Working load

• Deflection

• Working stress

• Operating cycles

A 0.7mm wire should not be selected by diameter alone. The required tensile strength and spring geometry should be evaluated together before production.

Applications

Compression Springs

302 stainless steel spring wire can be formed into compression springs used in mechanical assemblies, electrical components, consumer equipment, and industrial mechanisms.

For compression spring production, wire diameter, tensile strength, coil diameter, working load, and deflection should be considered together.

Extension Springs

The wire can also be used for extension springs subjected to tensile loading.

The final material and wire condition should be matched to the required working load, spring geometry, operating cycles, and service environment.

Torsion Springs

For torsion springs, the wire diameter is considered together with coil diameter, leg configuration, working angle, and required torque.

0.7mm 302 spring wire can be specified for suitable small and precision torsion spring designs when the mechanical requirements are met.

Precision Wire Forms

302 spring wire can also be processed into clips, hooks, retaining components, and other formed wire parts where an elastic stainless steel material is required.

Product Advantages

1. 302 Stainless Steel Grade

AISI 302 provides a commonly used stainless steel material for spring wire applications. Its chromium-nickel austenitic composition provides the corrosion resistance characteristics associated with stainless steel.

2. 0.15–12mm Supply Range

TOPONE supplies stainless steel spring wire in diameters from 0.15 to 12 mm, allowing buyers to specify different wire sizes according to spring design and forming requirements.

The featured product on this page is 0.70 mm.

3. Hard Spring Temper

The hard / spring temper is produced through cold working and is intended for spring applications requiring defined mechanical properties.

For this product, the specified tensile strength range is 1850–2150 N/mm², subject to the applicable standard and agreed specification.

4. Soap-Coated Surface

The soap-coated surface provides a lubricating surface condition for selected spring coiling and wire-forming processes.

Its suitability should be evaluated together with the customer's forming equipment and subsequent processing requirements.

5. Multiple Specification Options

Spring wire can be specified by:

• Material grade

• Diameter

• Tensile strength

• Surface condition

• Temper

• Applicable standard

• Coil weight

• Packaging

This allows the wire specification to be matched more closely to the spring manufacturing process.

Quality Control

For stainless steel spring wire, quality should be evaluated using measurable technical parameters rather than appearance alone.

Inspection and documentation can include:

• Material grade verification

• Wire diameter inspection

• Dimensional tolerance

• Tensile strength testing

• Surface condition inspection

• Coil weight verification

• Packaging inspection

• Mill Test Certificate (MTC), when required

For production orders, the required standard, diameter tolerance, tensile-strength range, surface condition, coil weight, and packaging should be confirmed before production.

How to Select 302 Stainless Steel Spring Wire

When selecting spring wire, buyers should confirm the following parameters:

Material Grade

Specify AISI 302 or the required equivalent grade according to the application.

Wire Diameter

Select the wire diameter according to the spring design, required load, coil diameter, and working stress.

Tensile Strength

Confirm the required tensile-strength range together with the applicable standard and temper condition.

Surface Condition

Specify soap-coated or another required surface condition according to the spring coiling and cleaning process.

Spring Type

Identify whether the wire will be used for compression, extension, torsion, or another formed spring.

Operating Conditions

For demanding applications, consider temperature, corrosion exposure, working cycles, load, and fatigue requirements.

Ordering Information

For a quotation of 302 stainless steel spring wire, provide:

1. Grade: AISI 302

2. Diameter: 0.70 mm or required size

3. Surface: Soap Coated

4. Temper: Hard / Spring Temper

5. Tensile Strength: Required range

6. Standard: ASTM / EN / DIN / JIS / GB

7. Quantity

8. Coil or spool requirement

9. Coil weight

10. Spring application

Providing the spring type and basic working conditions can help determine whether the selected wire specification is suitable for the intended forming process.

FAQ

What is 0.7mm 302 stainless steel spring wire used for?

It is commonly used for compression springs, extension springs, torsion springs, and formed wire components where a 0.70mm stainless steel spring wire is suitable for the required spring design.

What is the surface treatment of this spring wire?

This product uses a soap-coated surface, which is commonly specified for stainless steel spring wire used in wire feeding and spring coiling operations.

What is the tensile strength of 0.7mm 302 spring wire?

The specified tensile strength for this product is 1850–2150 N/mm². The final requirement should be confirmed according to the applicable standard and production specification.

Can 302 spring wire be supplied in other diameters?

Yes. TOPONE supplies stainless steel spring wire from 0.15–12 mm, subject to material grade, mechanical condition, surface treatment, and production requirements.

Which spring types can use 302 stainless steel spring wire?

Typical applications include compression springs, extension springs, torsion springs, and other formed wire components. Final suitability depends on spring geometry, load, operating cycles, and environmental conditions.

Technical Selection Guide

For spring manufacturers, the correct wire specification should be determined from the finished spring requirements.

A typical selection process is:

Wire Diameter → Spring Diameter → Working Load → Deflection → Working Stress → Operating Cycles → Temperature → Corrosion Environment → Forming Process

For a 0.7mm spring wire application, the wire diameter alone does not determine the final spring performance. The complete spring design and mechanical-property requirements should be reviewed before mass production.

Related Stainless Steel Spring Wire

TOPONE supplies stainless steel spring wire in different grades, diameters, tensile-strength ranges, and surface conditions.

Available options may include:

• 302 stainless steel spring wire

• 304 stainless steel spring wire

• 316 stainless steel spring wire

• Soap-coated spring wire

• Bright surface spring wire

• Different diameter specifications

• Coil and spool packaging

The appropriate material and surface condition should be selected according to the spring design, forming process, mechanical requirements, and operating environment.