Product Specification

0.2mm 302 Stainless Steel Spring Wire with Soap-Coated Surface

Product Introduction

0.2mm 302 Stainless Steel Spring Wire is a fine-diameter spring wire manufactured from AISI 302 stainless steel and supplied with a soap-coated surface.

With a nominal diameter of 0.20mm, this wire is intended for small springs and fine wire-forming applications where a compact wire size is required. Typical applications include miniature compression springs, extension springs, torsion springs and precision wire components.

AISI 302 is an austenitic chromium-nickel stainless steel grade widely used for spring wire. Its mechanical properties can be adjusted through cold working and the specified spring temper.

For 0.2mm spring wire, the final performance is influenced by more than the material grade. Wire diameter tolerance, tensile strength, spring geometry, forming process and operating conditions should all be considered when selecting the specification.

Product Specifications

Note: Tensile strength, dimensional tolerance and other mechanical requirements should be confirmed according to the applicable standard and production specification.

Why 0.2mm Spring Wire?

A 0.2mm wire diameter is suitable for applications where the spring or formed-wire component requires a fine cross-section.

Compared with larger spring wire, a smaller diameter can be considered for miniature components and compact assemblies. However, wire diameter should not be selected independently from spring design.

Important parameters include:

• Wire diameter

• Mean coil diameter

• Number of active coils

• Working load

• Working deflection

• Spring rate

• Operating cycles

• Installation space

• Forming method

For a miniature spring, these parameters work together to determine whether 0.2mm wire is appropriate for the required application.

302 Stainless Steel for Fine Spring Wire

AISI 302 stainless steel is commonly used for stainless steel spring wire because its mechanical properties can be developed through cold working.

During wire production, drawing and other cold-working operations increase the strength of the material. The final mechanical condition is therefore an important part of the spring wire specification.

For this reason, purchasing specifications for 0.2mm 302 spring wire should identify not only the grade but also the required mechanical properties and applicable material standard.

This approach provides a clearer basis for production and quality inspection.

Soap-Coated Surface

The soap-coated surface is an important feature of this product.

For spring manufacturing, the wire passes through feeding and coiling equipment before being formed into the final spring. Surface lubrication can affect the interaction between the wire and forming equipment.

A suitable soap-coated surface can support wire feeding and forming processes where lubrication is required.

The actual coating specification should be selected according to:

• Spring coiling equipment

• Wire feeding system

• Forming speed

• Subsequent cleaning process

• Final surface requirements

• Compatibility with the customer's production process

The coating should therefore be treated as part of the processing specification rather than simply as an appearance feature.

Typical Applications

Miniature Compression Springs

0.2mm 302 stainless steel spring wire can be used for small compression springs where the component requires a fine wire diameter.

Potential applications include compact mechanical assemblies, electrical components, small devices and precision mechanisms.

The final selection should be based on required spring force, working deflection and operating cycles.

Small Extension Springs

The wire can be formed into small extension springs when the required spring geometry and mechanical properties are compatible with the 0.2mm wire specification.

Working load and repeated extension should be considered when determining the appropriate material condition.

Miniature Torsion Springs

For small torsion springs, wire diameter, coil diameter and working angle must be evaluated together.

0.2mm wire may be considered for compact torsion spring designs where the required mechanical properties can be achieved.

Fine Wire Forms

In addition to conventional springs, fine stainless steel spring wire can be formed into clips, hooks and other small wire components.

The required temper and surface condition should be matched to the forming process.

Product Advantages

Fine 0.2mm Diameter

The 0.20mm diameter provides a fine wire size for miniature spring and precision wire-forming applications.

AISI 302 Material

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

Soap-Coated Surface

The soap-coated finish is suitable for applications where surface lubrication is required during wire feeding and spring coiling.

Suitable for Miniature Spring Designs

The fine diameter can be considered for compact spring designs where installation space and component size are important design factors.

Specification-Based Production

The wire can be specified according to measurable requirements such as material grade, diameter, tolerance, mechanical properties, surface condition and applicable standard.

This provides a more practical basis for quality control than relying only on general descriptions such as "high quality" or "high performance."

Quality Control

For 0.2mm fine spring wire, dimensional and surface inspection are particularly important because the wire is used in small-scale forming processes.

Quality-control items can include:

Material Verification

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

Diameter Inspection

The nominal diameter is 0.20mm. The required diameter tolerance should be agreed before production and checked using suitable measuring equipment.

Mechanical Testing

Tensile strength and other mechanical properties should be evaluated according to the specified standard and temper condition.

Surface Inspection

The soap-coated surface should be checked for uniformity and suitability for the intended wire-feeding and forming process.

Coil Inspection

Coil dimensions, coil weight and packaging should be checked according to the customer's requirements.

Inspection documents such as a Mill Test Certificate can be provided when included in the order specification.

How to Select 0.2mm 302 Spring Wire

Selecting fine stainless steel spring wire should start from the finished spring rather than the wire alone.

1. Define the Spring Type

Identify whether the component is a compression spring, extension spring, torsion spring or another formed-wire component.

2. Determine the Working Load

The required force and deflection help determine whether a 0.2mm diameter is suitable.

3. Check the Spring Geometry

Coil diameter, free length, active coils and spring index should be considered together with wire diameter.

4. Specify Mechanical Properties

The required tensile strength or spring temper should be clearly defined instead of using only general terms such as "hard wire."

5. Confirm the Surface Condition

For automated coiling, confirm whether a soap-coated surface is compatible with the customer's wire-feeding and forming process.

Ordering Information

For a quotation or technical inquiry, customers are recommended to provide:

• Material: AISI 302

• Diameter: 0.20mm

• Diameter tolerance

• Surface: Soap-coated

• Required tensile strength

• Temper condition

• Applicable standard

• Coil or spool requirements

• Coil weight

• Quantity

• Spring type or application

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

FAQ

What is 0.2mm 302 stainless steel spring wire used for?

It is mainly intended for fine-diameter spring applications, including miniature compression springs, extension springs, torsion springs and precision wire forms.

Why use a soap-coated surface?

A soap-coated surface can provide lubrication during wire feeding and spring coiling processes. The actual coating requirement should be matched to the customer's forming equipment and subsequent processing.

Is 0.2mm wire suitable for miniature springs?

It can be considered for miniature spring designs, but suitability depends on spring geometry, required load, deflection, operating cycles and mechanical properties.

What should be specified when buying 0.2mm spring wire?

The key parameters include material grade, diameter, tolerance, tensile strength, temper, surface condition, standard, quantity and packaging requirements.

Is 302 stainless steel suitable for spring applications?

AISI 302 is a commonly used austenitic stainless steel grade for spring wire. Its mechanical condition is developed through cold working and should be specified according to the intended spring application.

Technical Selection Guide for Fine Spring Wire

For miniature springs, selecting the smallest available wire diameter is not necessarily the correct approach.

A practical selection process is:

Spring load → working deflection → spring geometry → wire diameter → material grade → mechanical properties → surface condition

For this reason, 0.2mm 302 spring wire should be evaluated according to the complete spring design.

For applications involving high cycle counts, demanding working loads or elevated temperatures, the material specification and spring design should be reviewed before production.

Related Products

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

Related products may include:

• 302 stainless steel spring wire

• 304 stainless steel spring wire

• 316 stainless steel spring wire

• 0.2mm fine stainless steel wire

• Soap-coated stainless steel spring wire

• Bright surface stainless steel spring wire

The appropriate grade, diameter and surface condition should be selected according to the mechanical requirements and operating environment of the finished spring.