Stainless Steel CD Weld Studs – ISO 13918 Type PT

Stainless Steel CD Weld Studs – ISO 13918 Type PT

Juxin Fasteners manufactures stainless steel capacitor discharge (CD) weld studs for corrosion-resistant sheet metal assemblies, industrial equipment, 

stainless steel enclosures and precision-engineered mounting applications.

These externally threaded weld studs feature a circular welding flange and a central ignition tip designed for capacitor discharge arc stud welding.

The welding process creates a permanent threaded attachment point on compatible metal surfaces without requiring through-holes, 

helping manufacturers simplify assembly and maintain the integrity of fabricated panels.

Juxin Fasteners supplies OEM and custom stainless steel welding fasteners for equipment manufacturers, sheet metal fabricators, 

production engineers, purchasing departments and supplier development teams.

Product Specifications

Product Name: Stainless Steel CD Weld Studs

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

Product Type: Externally Threaded Welding Stud

Material: Stainless Steel

Primary Material Reference: A2 Stainless Steel / AISI 304 / EN 1.4301

Alternative Material Reference: A4 Stainless Steel / AISI 316 / EN 1.4401, Subject to Manufacturing and Welding Evaluation

Typical Property Classes: A2-50 and A4-50, Subject to Material Certification and Applicable Specifications

Standard: ISO 13918 Type PT

Historical Reference: DIN 32501 and ISO 13918:1998

Welding Process: Capacitor Discharge Arc Stud Welding

Welding Method: Tip Ignition

Welding Base: Circular Flange with Central Ignition Tip

Thread Type: External Metric Thread

Metric Thread References: M3, M4, M5, M6, M8, M10

Custom Thread Options: UNC / UNF Inch Threads, Subject to Engineering Review

Surface Finish: Natural Stainless Steel

Optional Surface Treatment: Passivation or Other Approved Treatment According to Customer Specifications

Manufacturing: Standard and Custom OEM Production

Primary Applications: Stainless Steel Sheet Metal, Food Processing Equipment, Medical Equipment, Electrical Enclosures, Marine Equipment and Industrial Machinery

What Are Stainless Steel CD Weld Studs?

Stainless steel CD weld studs are externally threaded fasteners designed for capacitor discharge arc stud welding.

A small ignition tip is positioned at the center of the welding flange.

During installation, stored electrical energy produces a short-duration welding arc between the stud and the parent metal.

The localized welding interface melts, and the stud is brought into contact with the workpiece to form a metallurgical joint.

After welding, the external thread provides a mounting point for nuts, brackets, supports, clamps and other components.

Unlike conventional mechanical fastening methods, capacitor discharge stud welding does not require drilling through the parent sheet.

The process can be performed from one accessible side of the assembly.

Why Choose Stainless Steel CD Weld Studs?

Stainless steel combines corrosion resistance with practical mechanical performance for a wide range of industrial applications.

The principal engineering advantages include:

Corrosion Resistance in Suitable Service Environments

Permanent Welded Attachment

No Through-Hole Required

Single-Sided Welding Access

Reduced Secondary Assembly Operations

Compact Mounting Geometry

Compatibility with Automated Welding Equipment

Metric and Custom Inch Thread Options

Suitable for Precision Sheet Metal Fabrication

These advantages depend on proper material selection, welding procedure qualification and application-specific testing.

ISO 13918 Type PT – Technical Design

ISO 13918 specifies dimensions, materials and mechanical characteristics for studs used in arc stud welding.

Type PT identifies externally threaded studs intended for tip-ignition welding.

The principal design elements include:

External Threaded Shank

Circular Welding Flange

Central Ignition Tip

Controlled Stud Length

Specified Flange Diameter

Specified Flange Thickness

Thread-to-Flange Concentricity

Ignition-Tip Geometry

For standard-compliant products, the applicable ISO 13918 dimensional requirements should be followed.

Special flange dimensions, modified ignition tips and nonstandard threads can be evaluated according to customer engineering drawings.

Stainless Steel 304 vs. 316 – Material Selection

AISI 304 stainless steel is widely used in industrial equipment, fabricated stainless steel enclosures and general corrosion-resistant assemblies.

It offers a practical balance of mechanical properties, corrosion resistance and manufacturing suitability.

AISI 316 stainless steel contains molybdenum, providing improved resistance to chloride-induced pitting in many service environments.

Typical material selection considerations include:

Operating Temperature

Moisture Exposure

Chloride Concentration

Cleaning Chemicals

Corrosive Process Fluids

Parent Metal Compatibility

Mechanical Loading

Welding Procedure Requirements

AISI 316 is not universally resistant to seawater corrosion, strong acids or all chemical environments.

For demanding applications, the exact material grade and service conditions must be evaluated.

Low-carbon stainless steel grades may also be considered where welding-related sensitization is a concern.

Metric Thread Specifications

Common ISO 13918 Type PT thread references include:

M3 × 0.5 — Nominal Diameter 3 mm / 0.1181 in.

M4 × 0.7 — Nominal Diameter 4 mm / 0.1575 in.

M5 × 0.8 — Nominal Diameter 5 mm / 0.1969 in.

M6 × 1.0 — Nominal Diameter 6 mm / 0.2362 in.

M8 × 1.25 — Nominal Diameter 8 mm / 0.3150 in.

M10 × 1.5 — Nominal Diameter 10 mm / 0.3937 in.

These inch values are nominal diameter conversions only.

Metric threads are not interchangeable with UNC or UNF threads.

Actual product availability, length ranges and flange dimensions must be confirmed according to the selected specification.

UNC and UNF Inch Thread Options

North American OEM projects may require Unified inch-series threaded welding studs.

Juxin Fasteners can evaluate custom stainless steel CD weld studs with inch threads according to approved engineering drawings.

Common thread references include:

#4-40 UNC — Nominal Diameter 0.112 in.

#6-32 UNC — Nominal Diameter 0.138 in.

#8-32 UNC — Nominal Diameter 0.164 in.

#10-24 UNC — Nominal Diameter 0.190 in.

#10-32 UNF — Nominal Diameter 0.190 in.

1/4-20 UNC — Nominal Diameter 0.250 in.

1/4-28 UNF — Nominal Diameter 0.250 in.

5/16-18 UNC — Nominal Diameter 0.3125 in.

These sizes are engineering references for potential custom manufacturing rather than a statement of stock availability.

Custom Unified threads should follow the applicable ASME B1.1 requirements.

Flange geometry, stud length and welding-tip dimensions must be independently verified.

Precision Welding Flange and Ignition-Tip Geometry

The welding flange provides the interface between the stud and the parent material.

The ignition tip initiates the arc during the capacitor discharge welding cycle.

Consistent flange dimensions and ignition-tip geometry help maintain repeatable welding conditions.

For automated assembly lines, dimensional variation can affect welding performance, stud alignment and joint consistency.

Critical characteristics may include:

Flange Diameter

Flange Thickness

Ignition-Tip Diameter

Ignition-Tip Height

Stud Straightness

Thread Concentricity

Thread Pitch Accuracy

Welding Surface Condition

These characteristics should be controlled according to the approved drawing and applicable inspection requirements.

Capacitor Discharge Welding of Stainless Steel

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

The process is commonly used for attaching relatively small studs to sheet metal components.

Important welding parameters include:

Welding Energy

Stud Diameter

Stainless Steel Grade

Parent Sheet Thickness

Surface Cleanliness

Welding Gun Configuration

Stud Alignment

Ignition-Tip Geometry

Electrical Grounding

Welding Cable Arrangement

Contact or Gap Welding Method

The welding procedure must be matched to the actual material and assembly.

Although CD welding generally introduces less total heat than many conventional arc welding processes, reverse-side marking and distortion cannot be ruled out without testing.

Corrosion Resistance and Surface Treatment

Stainless steel develops a chromium-rich passive oxide layer that contributes to its corrosion resistance.

The corrosion performance of a welded assembly depends on the selected stainless steel grade, surface condition, weld quality and service environment.

Potential surface treatment options include:

Natural Stainless Steel Finish

Cleaning and Degreasing

Passivation Where Specified

Customer-Approved Special Finishes

Passivation may be specified according to applicable ASTM A967 or ASTM A380 requirements.

Any surface treatment must be evaluated for compatibility with the welding process.

Copper flash plating is commonly associated with carbon steel CD welding studs and should not be assumed to be a standard requirement for stainless steel studs.

Food Processing Machinery Applications

Food processing equipment frequently uses stainless steel components because of their corrosion resistance and cleanability.

Stainless steel CD weld studs may be used for mounting components in suitable fabricated equipment assemblies.

Potential applications include:

Stainless Steel Equipment Housings

Food Processing Machine Covers

Conveyor Equipment Brackets

Control Panel Mounting

Packaging Machinery Enclosures

Equipment Access Panels

Auxiliary Support Brackets

For hygienic applications, engineers must evaluate weld surface condition, cleanability, crevice formation and exposure to cleaning chemicals.

A stainless steel material designation alone does not establish compliance with hygienic equipment requirements.

Medical Equipment and Laboratory Machinery

Medical and laboratory equipment manufacturers frequently require corrosion-resistant fastening solutions for fabricated metal assemblies.

Stainless steel CD weld studs may be suitable for:

Medical Equipment Cabinets

Diagnostic Equipment Housings

Laboratory Instrument Enclosures

Stainless Steel Equipment Panels

Instrument Support Brackets

Medical Cart Components

Equipment Access Covers

Applications involving sterilization, patient contact or regulated medical functions require additional material and design validation.

Electrical Control Cabinets and Industrial Enclosures

Stainless steel electrical enclosures are used in environments where corrosion resistance and long-term durability are important.

CD weld studs can provide permanent threaded attachment points for internal brackets and mounting hardware.

Potential applications include:

Electrical Control Cabinets

Industrial Automation Enclosures

Power Distribution Equipment

UPS Equipment Cabinets

Outdoor Electrical Housings

Instrumentation Cabinets

Control Panel Assemblies

For electrical bonding or protective grounding applications, the completed electrical connection must be independently qualified.

A welded stainless steel stud should not automatically be treated as a certified grounding connection.

Marine and Coastal Equipment

Marine and coastal environments expose fasteners to moisture, salt deposits and chloride-containing conditions.

Stainless steel CD weld studs may be used in suitable marine equipment assemblies, including:

Marine Electrical Enclosures

Coastal Instrument Cabinets

Shipboard Equipment Panels

Marine Control Equipment

Outdoor Communication Housings

Marine Auxiliary Mounting Brackets

A4 / 316 stainless steel may provide improved chloride corrosion resistance compared with A2 / 304.

However, chloride exposure, crevice conditions and the parent material must be evaluated before material approval.

Chemical Processing Equipment

Stainless steel welded mounting studs may be used in selected chemical processing equipment housings and auxiliary assemblies.

Potential applications include:

Process Instrument Enclosures

Stainless Steel Equipment Covers

Pump Equipment Panels

Control System Housings

Chemical Processing Machinery Guards

Auxiliary Equipment Brackets

Material selection must consider the actual chemical environment.

The suitability of 304 or 316 stainless steel cannot be established from the industry name alone.

Industrial Automation and Machinery

Industrial machinery manufacturers use welded threaded studs to simplify the assembly of sheet metal components.

Potential applications include:

Automation Equipment Covers

Machine Guarding Panels

Industrial Control Boxes

Sensor Mounting Brackets

Conveyor Equipment Enclosures

Equipment Access Panels

Stainless Steel Fabricated Frames

The selected fastener must satisfy the required mechanical loading, vibration and installation conditions.

Telecommunications and Data Center Equipment

Stainless steel CD weld studs may also be used in selected corrosion-resistant telecommunications and data center equipment assemblies.

Potential applications include:

Outdoor Network Equipment Enclosures

Telecommunications Control Cabinets

Liquid Cooling Equipment Housings

Instrumentation Panels

Electrical Equipment Mounting Brackets

Equipment Access Covers

Applications involving liquid cooling systems require separate evaluation of material compatibility, sealing and corrosion performance.

Stainless Steel CD Weld Studs vs. Projection Weld Studs

Although both products create welded threaded attachment points, their welding methods differ.

Stainless steel CD weld studs use a central ignition tip and a capacitor discharge arc welding process.

Projection weld studs use specially formed projections that concentrate current during resistance projection welding.

The products are not automatically interchangeable.

Engineers should select the fastener according to the welding equipment, parent material, sheet thickness, joint geometry and required mechanical performance.

Weld Strength and Quality Validation

The mechanical performance of a welded stud assembly depends on both the stud material and the completed weld.

Inspection and validation may include:

Visual Weld Inspection

Thread Gauge Inspection

Dimensional Inspection

Stud Alignment Verification

Bend Testing

Tensile Testing

Torque Testing

Weld Failure Evaluation

Surface Condition Inspection

Production Process Monitoring

Acceptance criteria should be established according to the qualified welding procedure and customer specifications.

The welded joint should not be assumed stronger than the stud or parent sheet without supporting test data.

OEM Custom Manufacturing

Juxin Fasteners supports drawing-based manufacturing of stainless steel CD welding studs.

Custom manufacturing options include:

A2 Stainless Steel Designs

A4 Stainless Steel Designs

Alternative Weldable Stainless Steel Grades

Metric Thread Configurations

Custom UNC / UNF Threads

Special Stud Lengths

Custom Flange Diameters

Modified Flange Thicknesses

Precision Ignition-Tip Dimensions

Special Thread Tolerances

Customer-Specified Surface Treatments

Custom Packaging and Identification

Manufacturing feasibility is evaluated according to the required dimensions, material specifications and production quantities.

Engineering Information Required for Quotation

To prepare an accurate quotation, please provide:

2D Engineering Drawing

3D CAD Model, If Available

Stainless Steel Grade

Thread Diameter and Pitch

Stud Length

Flange Diameter

Flange Thickness

Ignition-Tip Geometry

Parent Metal Grade

Parent Sheet Thickness

Surface Condition

Welding Equipment Information

Mechanical Performance Requirements

Corrosion Resistance Requirements

Required Quality Documentation

Estimated Annual Consumption

Target Delivery Schedule

Frequently Asked Questions

What is a stainless steel CD weld stud?

A stainless steel CD weld stud is a threaded fastener designed for capacitor discharge arc stud welding. It provides a permanent mounting point on a compatible metal surface.

What is ISO 13918 Type PT?

Type PT identifies externally threaded studs intended for tip-ignition stud welding.

What is the difference between 304 and 316 stainless steel CD weld studs?

304 stainless steel provides general-purpose corrosion resistance, while 316 stainless steel offers improved resistance to chloride-induced corrosion in many environments.

Do stainless steel CD weld studs require copper plating?

No. Copper plating is not a universal requirement for stainless steel CD weld studs. Surface treatment should follow the applicable material and welding specifications.

Can stainless steel CD weld studs be used on thin sheet metal?

Yes, for compatible materials and properly qualified welding conditions. The minimum suitable sheet thickness depends on the stud size, welding parameters and required joint performance.

Are stainless steel CD weld studs suitable for food processing equipment?

They may be suitable for selected equipment assemblies when material compatibility, cleanability and hygienic design requirements are satisfied.

Can stainless steel CD weld studs be supplied with UNC threads?

Custom UNC and UNF thread configurations can be evaluated according to customer engineering drawings.

Can stainless steel CD weld studs be used for electrical grounding?

They may form part of an engineered grounding or bonding assembly, but electrical continuity and compliance must be verified for the completed connection.

Can Juxin Fasteners manufacture custom stainless steel CD weld studs?

Yes. Juxin Fasteners supports OEM manufacturing according to customer drawings, including customized materials, thread dimensions, flange geometry and welding-tip specifications.

Request a Quote – Stainless Steel CD Weld Studs

Juxin Fasteners manufactures stainless steel welding fasteners for international OEM manufacturers, industrial equipment producers, sheet metal fabricators and engineering procurement teams.

We support design engineers, manufacturing engineers, production managers, purchasing managers and supplier development professionals seeking reliable threaded welding fasteners.

Send us your 2D/3D drawings, stainless steel grade, thread specifications, parent material information and estimated annual requirements for technical evaluation and quotation.

Manufacturer: Juxin Fasteners

Website: www.juxinfasteners.com

Email: info@juxinfasteners.com

Stainless Steel CD Weld Studs | ISO 13918 Type PT | Corrosion-Resistant Sheet Metal Fastening | 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.