Product Specification

Stainless Steel Cold Heading Wire for Fasteners and Cold Forging

Product Introduction

TOPONE stainless steel cold heading wire is designed for manufacturers producing fasteners and cold-formed components such as screws, bolts, nuts, rivets, pins, studs, and other precision wire-formed parts.

The wire is available in multiple stainless steel grades, including 201, 202, 302, 302HQ, 304, 304HC, and 316, allowing manufacturers to select material according to cold heading requirements, corrosion environment, forming process, and finished-component specifications.

Cold heading is a forming process in which wire is shaped inside a die at room temperature. The selected wire therefore needs to provide an appropriate combination of formability, ductility, surface condition, and mechanical propertiesfor the intended forming operation.

TOPONE supplies cold heading wire with bright or soap-coated surfaces and can provide different delivery conditions according to customer requirements.

Product Specifications

Diameter range, tolerance, tensile strength, elongation, hardness, and surface condition should be confirmed according to the selected grade and customer's production requirements.

What Is Stainless Steel Cold Heading Wire?

Cold heading wire is stainless steel wire prepared for cold forming operations.

During cold heading, a section of wire is inserted into a die and subjected to compressive force. The material flows into the die cavity to form the required head or component geometry.

This process is widely used for manufacturing fasteners because multiple forming operations can be performed without heating the workpiece.

The suitability of the wire depends on several factors, including:

• Stainless steel grade

• Wire diameter

• Delivery condition

• Surface condition

• Chemical composition

• Mechanical properties

• Heading ratio

• Die geometry

• Number of forming operations

Therefore, cold heading wire should be selected according to the actual fastener design rather than by grade alone.

Available Stainless Steel Grades

Different grades provide different combinations of corrosion resistance, formability, and work-hardening characteristics.

302HQ Stainless Steel Cold Heading Wire

302HQ is a specialized austenitic stainless steel grade commonly used for cold heading applications.

Its copper-containing composition is intended to reduce work hardening compared with conventional 302/304-type grades, making it suitable for fastener production requiring cold forming.

Typical applications include:

• Screws

• Self-tapping screws

• Small machine screws

• Precision fasteners

304 / 304HC Stainless Steel Cold Heading Wire

304 is a widely used stainless steel grade for general-purpose fasteners and cold-formed components.

304HC is used when the cold heading process requires a suitable balance of formability and mechanical properties.

Typical applications include:

• Bolts

• Screws

• Nuts

• Rivets

• General stainless steel fasteners

316 Stainless Steel Cold Heading Wire

316 stainless steel contains molybdenum and is generally selected when improved resistance to chloride-containing environments is required compared with standard 304 applications.

It can be considered for fasteners used in:

• Marine-related equipment

• Chemical environments

• Outdoor hardware

• Equipment exposed to chloride-containing conditions

The final material selection should be based on the actual service environment and applicable specification.

201 / 202 Stainless Steel Cold Heading Wire

201 and 202 stainless steel grades can be considered for applications where material cost, forming requirements, and service environment are balanced according to the finished product.

The appropriate grade should be selected based on the required chemical composition, mechanical properties, corrosion environment, and cold-forming process.

Surface Options

Bright Surface

Bright surface wire is suitable where surface appearance is important or where the wire will undergo a controlled forming process without requiring additional surface lubrication from the supplied coating.

It can be used for visible fasteners and components where a clean metallic surface is required.

Soap-Coated Surface

Soap coating provides a lubricating layer that can be used during subsequent cold heading or forming operations.

The appropriate coating should be selected according to:

• Heading equipment

• Die design

• Forming speed

• Number of forming stages

• Required lubrication

• Subsequent cleaning process

For high-volume fastener production, the surface/coating specification should be agreed with the wire supplier before production.

Delivery Conditions

Cold heading wire can be supplied in different conditions depending on the required forming operation.

Annealed Condition

Annealed wire provides a softer and more ductile material condition and may be considered when substantial cold deformation is required.

Cold Drawn Condition

Cold drawn wire provides controlled dimensional characteristics and mechanical properties according to the specified drawing condition.

Customized Condition

For specialized fastener production, the delivery condition can be discussed according to the customer's heading process, component geometry, and mechanical requirements.

Typical Applications

Fasteners

Stainless steel cold heading wire is commonly processed into:

• Screws

• Bolts

• Nuts

• Rivets

• Pins

• Studs

• Washers and related components

Automotive Components

Depending on the selected material grade and application requirements, cold heading wire can be used for selected automotive fasteners and formed metal components.

The appropriate stainless steel grade should be determined based on temperature, corrosion exposure, mechanical loading, and applicable automotive specifications.

Construction Hardware

Potential applications include:

• Building fasteners

• Stainless steel screws

• Anchoring components

• Hardware fittings

• Structural fastening components

Industrial Equipment

Cold heading wire can also be used for customized fasteners and formed components used in machinery, equipment, electrical products, and general industrial assemblies.

How to Select Stainless Steel Cold Heading Wire?

Selecting the correct wire requires more than choosing a stainless steel grade.

1. Confirm the Finished Component

Provide the fastener drawing or finished-part dimensions, including:

• Head diameter

• Head height

• Shank diameter

• Thread dimensions

• Overall length

• Forming stages

2. Determine the Heading Process

The supplier should understand whether the component is produced through:

• Single-stage heading

• Multi-stage cold heading

• Cold extrusion

• Heading + thread rolling

• Other forming operations

3. Select the Material Grade

Consider:

• Required corrosion resistance

• Cold-forming behavior

• Work-hardening characteristics

• Mechanical requirements

• Service environment

• Applicable standard

4. Select the Surface Condition

Bright and soap-coated surfaces should be selected according to the forming equipment and lubrication requirements.

5. Confirm Mechanical Requirements

Depending on the application, specifications may include:

• Tensile strength

• Yield strength

• Elongation

• Hardness

• Dimensional tolerance

These values should be confirmed for the selected grade and delivery condition rather than using one generic value for all grades.

Quality Control

For stainless steel cold heading wire, quality control should focus on measurable parameters related to the customer's forming process.

Key inspection items include:

• Chemical composition

• Material grade

• Wire diameter

• Diameter tolerance

• Surface condition

• Tensile strength

• Elongation

• Hardness

• Coil dimensions

• Weight

• Batch identification

• Applicable material standard

TOPONE operates under an ISO 9001:2015 quality management system. The product page currently identifies ISO9001:2015 certification, while specific material inspection data should be provided according to the grade and order specification.

Packing

Cold heading wire can be supplied in coil or other specified packaging according to the customer's production equipment.

For automated cold heading production, the following packing details can be confirmed:

• Coil inner diameter

• Coil outer diameter

• Coil weight

• Wire feeding direction

• Spool requirements

• Identification labels

• Special packing requirements

The current TOPONE product information also lists coil inner diameters of approximately 250–1000mm for cold heading wire products, but the final packing specification should be confirmed for each order.

FAQ

What is stainless steel cold heading wire used for?

It is mainly used for producing cold-formed fasteners and components such as screws, bolts, nuts, rivets, pins, and studs.

Which stainless steel grades are available?

TOPONE's cold heading wire range includes grades such as 201, 202, 302, 302HQ, 304, 304HC, and 316, with the exact availability depending on product specification and order requirements.

What is the difference between 302HQ and 304HC?

Both are used for cold heading, but their chemical composition and cold-forming characteristics differ. 302HQ is specifically developed for cold heading applications, while 304HC is used as a cold-heading grade based on 304 chemistry with controlled composition for forming requirements.

Is soap coating necessary for cold heading wire?

Not always. The appropriate surface depends on the forming equipment, die design, lubrication system, forming stages, and subsequent processing. Bright and soap-coated conditions can be selected according to the production process.

Can the cold heading wire be customized?

Yes. Customers can specify material grade, diameter, tolerance, mechanical properties, surface condition, delivery condition, coil dimensions, and packing requirements.