Flanged Threaded CD Weld Studs – Inch & Metric

Flanged Threaded CD Weld Studs – Inch & Metric

Juxin Fasteners manufactures flanged threaded capacitor discharge (CD) weld studs for automotive OEM assemblies, thin sheet metal fabrication, electrical equipment, industrial enclosures and precision manufacturing applications.

These externally threaded welding fasteners feature a circular flange and a small ignition tip on the welding face. The design is intended for capacitor discharge arc stud welding, providing a permanent threaded attachment point on compatible metal surfaces.

Our manufacturing capabilities support copper-plated low-carbon steel studs, stainless steel versions, aluminum alloys and customer-specified materials, including brass where technically suitable.

Standard metric and UNC inch threads, customized dimensions and drawing-based OEM production are available for engineering evaluation.

Product Specifications

Product Name: Flanged Threaded Capacitor Discharge Weld Studs

Alternative Names: Flanged CD Weld Studs, CD Threaded Studs, Tip-Ignition Threaded Weld Studs, Capacitor Discharge Welding Screws

Primary Material: Low-Carbon Steel

Primary Steel Finish: Copper Flash Plating

Additional Materials: Stainless Steel, Aluminum and Brass

Standard Reference: ISO 13918:2017, Type PT

Historical Standard Reference: DIN 32501

Welding Process: Capacitor Discharge Arc Stud Welding with Tip Ignition

Welding Methods: Contact and Gap CD Stud Welding, Subject to Equipment Compatibility

Head Configuration: Circular Welding Flange

Welding Feature: Calibrated Ignition Tip

Thread Configuration: External Machine Screw Thread

Thread Systems: ISO Metric, UNC and Selected UNF

Metric Thread Tolerance: According to the Approved Drawing and Applicable ISO Standard

Inch Thread Class: According to the Approved Drawing and Applicable ASME Standard

Flange Diameter: Standard or Customized

Stud Length: According to the Approved Drawing

Ignition-Tip Geometry: Controlled According to Welding Requirements

Manufacturing Service: OEM Custom Production

Applications: Automotive Components, Electrical Enclosures, Sheet Metal Assemblies and Industrial Equipment

What Are Flanged CD Weld Studs?

Flanged capacitor discharge weld studs are threaded metal fasteners designed for rapid attachment to compatible metal surfaces using stored electrical energy.

A capacitor discharge welding system releases a short pulse of energy through the stud and workpiece.

The ignition tip initiates the welding arc. Localized melting occurs at the interface, and the stud is brought into contact with the workpiece to complete the welded joint.

Once installed, the external threads provide a mounting point for nuts, brackets, electrical components and mechanical assemblies.

Unlike conventional bolted connections, the welding operation does not require a through-hole in the parent sheet.

This makes CD weld studs particularly useful where the reverse side of a metal panel must remain visually acceptable or inaccessible during assembly.

ISO 13918 Type PT and DIN 32501

ISO 13918:2017 specifies requirements for studs and ceramic ferrules used in arc stud welding.

Within this standard, Type PT identifies threaded studs intended for stud welding with tip ignition.

Type PT is the relevant standardized product designation for this externally threaded CD stud configuration.

DIN 32501 is a historical German standard reference commonly associated with capacitor discharge welding studs.

For new OEM projects, ISO 13918:2017 should be considered alongside the customer's engineering drawing and applicable welding specifications.

Compliance with a particular standard must be verified against the actual product dimensions, material properties and inspection requirements.

Why the Welding Flange Matters

The circular flange is a defining feature of this product.

Compared with the threaded shank, the flange provides a larger welding interface.

Its geometry helps establish the intended welding contact area and supports controlled joining to the parent material.

The flange also helps keep the arc concentrated around the welding interface rather than allowing it to migrate along the threaded shank.

Important flange design parameters include:

Flange Outside Diameter

Flange Thickness

Flange Flatness

Flange Concentricity

Welding Face Condition

Ignition-Tip Position

Flange-to-Shank Transition

The required dimensions depend on stud diameter, welding equipment and application requirements.

Calibrated Ignition Tip for CD Stud Welding

The ignition tip is a small projection located at the center of the welding face.

This feature is essential to the tip-ignition welding process.

When electrical energy is discharged, the ignition tip helps initiate the arc and controls the initial welding event.

Ignition-tip geometry can influence:

Arc Initiation

Arc Stability

Local Heat Generation

Welding Repeatability

Weld Interface Formation

Stud Positioning

Weld Quality Consistency

For high-volume production, ignition-tip height and diameter should be controlled according to the approved drawing and welding procedure.

Copper-Plated Low-Carbon Steel CD Weld Studs

Copper-flash-plated low-carbon steel is widely used for capacitor discharge threaded studs.

Low-carbon steel provides a weldable base material and an economical solution for repeat manufacturing.

The thin copper coating provides a controlled metallic surface and can improve electrical contact characteristics during welding.

However, copper flash plating should not be treated as equivalent to a dedicated high-corrosion-resistance coating.

Corrosion performance depends on coating thickness, exposure conditions and subsequent processing.

For automotive and electrical equipment applications, the final corrosion protection system should be specified separately when required.

Juxin Fasteners can evaluate customer requirements for copper plating, material chemistry, dimensional tolerances and welding performance.

Stainless Steel CD Weld Studs

Stainless steel threaded CD studs are suitable for applications requiring corrosion resistance and compatible welding characteristics.

Potential material options include A2-family stainless steels and other weldable stainless grades.

Material selection depends on environmental exposure, mechanical requirements and the parent metal.

Stainless steel studs may be considered for:

Outdoor Electrical Enclosures

Commercial Kitchen Equipment

Medical Equipment Housings

Industrial Control Cabinets

Stainless Steel Sheet Metal Assemblies

Food Processing Equipment

The appropriate alloy and welding procedure must be confirmed for the specific application.

Aluminum CD Weld Studs

Aluminum capacitor discharge studs provide a lightweight fastening solution for compatible aluminum components.

Potential applications include lightweight equipment housings, electronic enclosures and selected transportation components.

Aluminum alloy selection must account for weldability, electrical conductivity, mechanical properties and parent material compatibility.

Aluminum CD studs should not be assumed interchangeable with steel studs.

Brass CD Weld Studs

Brass configurations may be evaluated for specialized electrical and mechanical applications.

The brass alloy must be selected according to its welding suitability and the mating workpiece material.

Electrical conductivity alone does not establish weld compatibility.

Material and process qualification are necessary before production.

Metric Thread Sizes

Juxin Fasteners can evaluate the following metric threaded CD stud configurations:

M3 × 0.5

M4 × 0.7

M5 × 0.8

M6 × 1.0

M8 × 1.25

M10 × 1.5

Additional metric dimensions, including M2.5 and selected M12 designs, may be evaluated according to customer requirements.

Availability, stud length, flange dimensions and ignition-tip geometry must be confirmed for each specification.

UNC and UNF Inch Thread Sizes

Common inch-series threaded CD weld stud sizes include:

#2-56 UNC — 0.0860 in. Nominal Diameter (2.1844 mm)

#4-40 UNC — 0.1120 in. Nominal Diameter (2.8448 mm)

#6-32 UNC — 0.1380 in. Nominal Diameter (3.5052 mm)

#8-32 UNC — 0.1640 in. Nominal Diameter (4.1656 mm)

#10-24 UNC — 0.1900 in. Nominal Diameter (4.8260 mm)

#10-32 UNF — 0.1900 in. Nominal Diameter (4.8260 mm)

1/4-20 UNC — 0.2500 in. Nominal Diameter (6.3500 mm)

5/16-18 UNC — 0.3125 in. Nominal Diameter (7.9375 mm)

3/8-16 UNC — 0.3750 in. Nominal Diameter (9.5250 mm)

These are nominal thread designations, not guaranteed stock sizes or complete stud dimensions.

Metric and inch thread systems are not directly interchangeable.

For example, M6 × 1.0 and 1/4-20 UNC have different nominal diameters and thread pitches.

Custom inch-series designs can be evaluated against the applicable ASME thread requirements.

Capacitor Discharge Stud Welding Process

Capacitor discharge stud welding uses electrical energy stored in capacitors to produce a short-duration welding arc.

A typical process includes:

1. Clean and prepare the parent metal surface.

2. Install the appropriate stud in the welding gun.

3. Position the ignition tip against the intended weld location.

4. Set the welding parameters according to the qualified procedure.

5. Release the stored electrical energy.

6. Initiate the welding arc at the ignition tip.

7. Bring the stud and workpiece together to form the welded joint.

8. Allow the joint to solidify.

9. Inspect the finished weld according to the application requirements.

The actual sequence depends on whether contact or gap welding equipment is used.

Stud diameter, material, parent sheet thickness, surface condition and welding equipment all influence the required settings.

CD Welding vs. Resistance Projection Welding

Capacitor discharge stud welding and resistance projection welding are different joining processes.

CD stud welding uses a short-duration arc initiated at the stud tip.

Resistance projection welding uses electrical resistance heating and applied electrode force at engineered contact projections.

The equipment, joint design and process controls are not interchangeable.

Flanged CD weld studs should therefore be specified for the appropriate capacitor discharge welding process rather than treated as conventional ring projection weld studs.

Advantages for Thin Sheet Metal Assemblies

CD welding is particularly relevant to applications where controlled heat input is important.

Potential manufacturing benefits include:

Single-Sided Installation

No Pre-Drilled Mounting Hole

Reduced Secondary Fastening Operations

Permanent Threaded Attachment Points

Short Welding Cycle

Suitability for Thin Sheet Metal

Reduced Risk of Reverse-Side Marking

Improved Manufacturing Flexibility

Compatibility with Automated Stud Welding Equipment

Reduced Assembly Handling

The actual weld strength, deformation and reverse-side appearance depend on sheet thickness, material and qualified welding parameters.

No universal minimum sheet thickness or guaranteed mark-free result should be assumed.

Automotive OEM and Electric Vehicle Applications

Flanged threaded CD weld studs can provide mounting points on compatible automotive metal components.

Potential applications include:

Automotive Sheet Metal Brackets

Vehicle Interior Metal Assemblies

Body Equipment Mounting

Automotive Electrical Enclosures

Wiring Harness Support Brackets

Battery Pack Auxiliary Steel Brackets

Battery Management System Equipment Mounting

Electric Vehicle Power Distribution Enclosures

Thermal Management Equipment Supports

Automotive Accessory Brackets

For EV battery pack and BMS assemblies, stud selection must account for the enclosure material, electrical isolation, vibration, mechanical loading and corrosion requirements.

Steel CD studs should not be assumed suitable for direct welding to aluminum battery housings without specific qualification.

Electrical Enclosures and Power Distribution Equipment

Flanged threaded CD studs can provide attachment points for electrical equipment mounted inside fabricated metal enclosures.

Potential applications include:

Industrial Switchgear Cabinets

Electrical Distribution Panels

UPS Equipment Enclosures

Power Conversion Cabinets

Control Panel Structures

DC Power Distribution Equipment

Industrial Battery Storage Cabinets

Electrical Equipment Mounting Brackets

Where a stud is intended to provide an electrical grounding or bonding connection, the complete assembly must be evaluated for electrical continuity and applicable safety requirements.

Dedicated CD grounding stud designs may be preferable for specialized grounding applications.

AI Data Centers and Communication Equipment

Data center infrastructure requires large quantities of accurately fabricated metal equipment.

Potential applications include:

Server Cabinet Sheet Metal

Power Distribution Equipment Housings

Communication Equipment Cabinets

Cooling Equipment Metal Panels

Industrial Network Enclosures

Data Center Electrical Control Cabinets

Rack-Mounted Equipment Brackets

CD threaded studs may help simplify the installation of internal mounting components where the sheet material and assembly design are suitable.

HVAC and Thermal Management Equipment

Flanged CD weld studs can be used in compatible fabricated sheet metal assemblies for:

HVAC Equipment Cabinets

Ventilation System Housings

Air Handling Equipment

Industrial Cooling Equipment

Heat Exchanger Support Panels

Refrigeration Equipment Enclosures

Cooling System Brackets

The welding process should be validated to avoid unacceptable panel distortion or surface marking.

Medical and Laboratory Equipment

Potential applications include:

Medical Equipment Metal Enclosures

Diagnostic Equipment Cabinets

Laboratory Instrument Housings

Medical Electronics Support Structures

Stainless Steel Equipment Panels

Material selection and surface finish should be matched to cleaning requirements and the operating environment.

Commercial Kitchen and Food Processing Equipment

CD welding studs can provide threaded attachment points on compatible metal equipment.

Potential applications include:

Commercial Oven Housings

Industrial Kitchen Equipment

Stainless Steel Appliance Panels

Food Processing Machine Enclosures

Equipment Support Brackets

For hygienic applications, material selection, joint accessibility and cleanability require additional consideration.

Manufacturing and OEM Customization

Juxin Fasteners manufactures standard and custom threaded CD weld studs for OEM production.

Customization may include:

Metric Thread Specifications

UNC and UNF Threads

Stud Diameter

Stud Length

Flange Diameter

Flange Thickness

Ignition-Tip Diameter

Ignition-Tip Height

Material Grade

Copper Plating Requirements

Stainless Steel Alloy Selection

Aluminum Alloy Selection

Custom Surface Finish

Thread Tolerance

Special Dimensional Requirements

Customer-Specific Packaging

Prototype and Production Quantities

Manufacturing methods are selected according to the approved product geometry, material requirements and production volume.

Engineering Design Considerations

Successful CD stud welding requires the stud, parent material and welding equipment to be considered as a complete system.

Important design parameters include:

Parent Metal Grade

Parent Metal Thickness

Stud Material

Stud Diameter

Stud Length

Flange Geometry

Ignition-Tip Geometry

Surface Coating

Electrical Contact Conditions

Welding Energy

Welding Gun Setup

Stud Perpendicularity

Weld Strength Requirements

Reverse-Side Appearance

Corrosion Protection

Assembly Torque

Design engineers should confirm whether the application requires mechanical fastening only or an additional electrical function.

Quality Control and Weld Validation

For OEM production, inspection requirements may include:

Material Verification

Thread Gauge Inspection

Stud Length Measurement

Flange Diameter Inspection

Flange Thickness Inspection

Ignition-Tip Geometry Inspection

Surface Plating Inspection

Visual Defect Inspection

Dimensional Inspection Reports

Weld Bend Testing

Weld Tensile Testing

Weld Torque Testing

Customer-Specified Process Validation

Where required, material certificates, dimensional reports, PPAP documentation and other customer-specific records can be evaluated during quotation and production planning.

Weld testing should be performed using representative parent materials and the qualified welding procedure.

Frequently Asked Questions

What is a flanged CD weld stud?

A flanged CD weld stud is a welding fastener featuring a circular welding base and an ignition tip. 

It is attached to compatible metal surfaces using capacitor discharge arc stud welding.

What does CD mean in stud welding?

CD stands for Capacitor Discharge. 

The welding system stores electrical energy in capacitors and releases it rapidly to create a short-duration welding arc.

What is ISO 13918 Type PT?

Type PT identifies threaded studs intended for stud welding with tip ignition under ISO 13918.

Why are mild steel CD studs copper plated?

Copper flash plating provides a controlled metallic surface and can support electrical contact during welding.

 Its corrosion protection is limited and depends on the coating specification.

Are CD weld studs suitable for thin sheet metal?

Yes. CD welding is widely used for thin metal sheets because of its short welding duration and relatively low total heat input.

 Actual suitability must be verified for the workpiece.

Are inch and metric CD weld studs available?

Yes. Juxin Fasteners supports standard metric and inch-series thread configurations, as well as custom drawing-based designs.

Can stainless steel CD weld studs be supplied?

Yes. Stainless steel versions can be evaluated according to the required alloy, dimensions and welding application.

Can CD weld studs be used for electrical grounding?

They may form part of an electrical connection when the stud and complete assembly are designed and validated for that purpose.

 Dedicated grounding stud configurations are available for specialized applications.

Are CD weld studs the same as projection weld studs?

No. CD welding uses an arc initiated at the ignition tip, while resistance projection welding relies on resistance heating and electrode pressure.

Can Juxin Fasteners manufacture custom CD weld studs?

Yes. Custom production can include special flange dimensions, ignition-tip geometry, thread sizes, materials, finishes and customer-specific requirements.

Request a Flanged CD Weld Stud OEM Quotation

Juxin Fasteners manufactures flanged threaded capacitor discharge weld studs for international OEM customers.

We support design engineers, manufacturing engineers, production managers,

 purchasing teams and supplier development professionals requiring reliable threaded welding fasteners for industrial production.

Please provide the following information for engineering evaluation:

2D Engineering Drawing

3D CAD Model, If Available

Required Thread Size and Pitch

Stud Length

Flange Diameter and Thickness

Ignition-Tip Dimensions

Material Grade

Surface Finish

Parent Metal Material

Parent Metal Thickness

Welding Equipment or Process Requirements

Mechanical Load Requirements

Electrical Requirements, If Applicable

Inspection and Quality Documentation

Prototype Quantity

Production Order Quantity

Estimated Annual Demand

Our engineering sales team can review the specifications and prepare a manufacturing quotation based on your requirements.

Manufacturer: Juxin Fasteners

Website: www.juxinfasteners.com

Email: info@juxinfasteners.com

Flanged Threaded CD Weld Studs | Metric & Inch | Custom OEM Manufacturing

Packaging Standard

At Juxin Fasteners, we apply standardized export packaging to ensure product protection, traceability, and compliance with international logistics requirements.

1. Standard Export Packaging

Unless otherwise specified, all products will be packed according to our factory standard export packaging, which includes:

Moisture-resistant inner protection

Poly bag or small box packing as required

Reinforced export cartons

Clear labeling with part number, specification, batch number, and quantity

Palletizing for sea or air shipment when necessary

Our standard packaging is designed to ensure safe transportation, efficient warehousing, and long-distance international shipping.

2. Customized Packaging Options

We also provide customized packaging solutions according to customer requirements, including but not limited to:

Private labeling

Customized barcodes

Specific carton dimensions

Retail packaging

Special pallet configuration

Customer-specific marking and identification

So that you know, customized packaging may involve additional costs and extended lead time depending on the complexity of the requirements.

3. Compliance & Quality Assurance

All packaging processes are controlled under our ISO 9001 quality management system to ensure consistency, traceability, and product integrity throughout the supply chain.