Stainless Steel DIN 929 Hex Weld Nuts – 304 & 316

Stainless Steel DIN 929 Hex Weld Nuts – 304 & 316

A2/A4 Stainless Steel Hexagon Projection Weld Nuts for OEM Manufacturing

Juxin Fasteners manufactures DIN 929 stainless steel hex weld nuts for automotive components, stainless steel sheet metal fabrication, industrial enclosures and corrosion-sensitive equipment assemblies.

These internally threaded fasteners feature a hexagonal body, three welding projections and a circular locating pilot.

 They are designed to provide permanent threaded attachment points through resistance projection welding to compatible metal components.

Our specified materials include SUS304 and SUS316 stainless steel. The product range covers M5, M6, M8, M10, M12, M14 and M16, with metric coarse and selected fine-thread configurations.

For North American OEM applications, custom Unified UNC and UNF thread configurations can be evaluated according to customer drawings.

Juxin Fasteners is an industrial fastener manufacturer supporting cold heading, cold forming, CNC machining where required, OEM/ODM customization and industrial batch manufacturing.

Product Specifications

The final material, dimensions, thread tolerance, welding requirements and inspection criteria must follow the approved engineering drawing.

What Is a Stainless Steel DIN 929 Hex Weld Nut?

A stainless steel hex weld nut is a hexagonal internally threaded fastener designed to be permanently attached to a compatible metal workpiece.

Unlike an ordinary hex nut, the DIN 929 design incorporates welding projections and a locating pilot.

The typical configuration includes:

• Six-sided nut body.

• Central internal thread.

• Three welding projections.

• Circular locating pilot.

• Defined nut height.

• Dimensions suitable for resistance projection welding.

The locating pilot assists positioning over a prepared workpiece hole.

The welding projections concentrate electrical current and electrode force to form localized welded connections.

Once the weld is properly formed, the nut provides a fixed threaded attachment point.

The nut-to-workpiece connection is permanent, while the mating bolt can generally be removed for maintenance or disassembly.

DIN 929 Standard and Product Geometry

DIN 929 is the principal international reference for hexagon weld nuts.

The standard defines relevant product geometry, including the hexagonal body, locating pilot and welding projections.

DIN 929 is distinct from DIN 928 square weld nuts and DIN 977 hexagon flange weld nuts.

For stainless steel configurations, material requirements must be specified separately and verified against the approved drawing.

DIN 929 Stainless Steel Hex Weld Nut Dimensions

The following are nominal DIN 929 dimensional references.

Dimensions are in millimeters.

These values are nominal references rather than a complete manufacturing drawing. 

Pilot height, welding projection dimensions, thread tolerances and other requirements must be verified against the selected DIN 929 edition.

SUS304 Stainless Steel Hex Weld Nuts

SUS304 is an austenitic stainless steel commonly associated with the A2 stainless steel fastener material group.

It is widely used in industrial applications requiring corrosion resistance and suitable manufacturing characteristics.

Potential applications include:

• Stainless steel equipment enclosures.

• Automotive mounting components.

• Fabricated sheet metal assemblies.

• Industrial machinery.

• Indoor and general industrial environments.

Actual suitability depends on the service environment, material specification and welding process.

SUS316 Stainless Steel Hex Weld Nuts

SUS316 is a molybdenum-containing austenitic stainless steel commonly associated with the A4 fastener material group.

Compared with typical 304 stainless steel, 316 generally offers improved resistance to localized corrosion in certain chloride-containing environments.

Potential applications include:

• Coastal industrial equipment.

• Marine equipment enclosures.

• Chemical processing machinery.

• Food processing equipment.

• Industrial washdown systems.

• Corrosion-sensitive mounting brackets.

SUS316 is not immune to pitting, crevice corrosion or stress corrosion cracking.

Material selection must consider the actual chemical exposure, temperature and service conditions.

304 vs. 316 Stainless Steel Hex Weld Nuts

The material grade should be selected according to the actual operating environment and approved customer requirements.

Stainless Steel Material Designations

Common international references include:

These are commonly corresponding material references, not unconditional certifications of equivalence.

The actual chemical composition and mechanical properties must be specified and verified.

Mechanical Properties of Stainless Steel Weld Nuts

ISO 3506-2 may be relevant when specifying mechanical properties for applicable stainless steel nuts.

The required property class must be confirmed for the actual product configuration.

Nut mechanical properties and welded attachment strength are separate engineering considerations.

A nut with satisfactory thread strength may still fail if the welding process does not produce an adequate attachment.

Metric Coarse Thread Specifications

These are metric coarse-thread references.

Selected fine-thread configurations are included in the stated product offering, subject to confirmation of the exact thread designation and material-specific availability.

Metric Fine Thread Options

Common engineering reference designations include:

These are reference thread designations, not a statement that every configuration is stocked in both SUS304 and SUS316.

Custom fine-thread hex weld nuts require dimensional and manufacturing feasibility confirmation.

American UNC and UNF Stainless Steel Hex Weld Nuts

North American OEM customers may require Unified inch-thread weld nuts.

Juxin Fasteners supports engineering feasibility review for custom UNC and UNF configurations.

Pitch equivalents are dimensional references.

These inch-thread sizes are custom engineering options, not confirmed stock configurations or standard DIN 929 dimensions.

ASME B1.1 Unified Thread Requirements

For custom inch-thread hex weld nuts, ASME B1.1 is the relevant Unified thread standard.

The customer drawing should identify:

• Thread designation.

• UNC or UNF series.

• Internal thread class.

• Thread direction.

• Hexagonal body dimensions.

• Pilot geometry.

• Welding projection dimensions.

Internal thread class 2B may be specified where appropriate.

ASME B1.1 does not independently establish the external weld nut geometry or welding performance.

Metric and Inch Threads Are Not Interchangeable

For example:

The exact thread designation must match the mating bolt.

Three-Projection Welding Design

DIN 929 hex weld nuts typically incorporate three welding projections arranged around the threaded opening.

These projections concentrate current and pressure during resistance projection welding.

Important geometric characteristics include:

• Projection height.

• Projection width.

• Projection location.

• Projection consistency.

• Nut flatness.

• Contact with the workpiece.

The completed weld strength depends on the projection geometry, welding process and workpiece properties.

Circular Locating Pilot

The locating pilot is a characteristic feature of the typical DIN 929 design.

It helps align the nut with the workpiece hole and can assist automated positioning.

The pilot may also help reduce the risk of welding residue entering the internal thread.

However, it does not guarantee complete protection against weld spatter or thread distortion.

The mounting hole, pilot diameter, pilot height and welding electrode must be designed as a compatible system.

Resistance Projection Welding of Stainless Steel Nuts

Resistance projection welding is commonly used to attach appropriately designed weld nuts to metal components.

The process applies controlled electrical current and electrode force to create localized welded connections.

Critical variables include:

• Stainless steel grade.

• Workpiece material.

• Workpiece thickness.

• Welding current.

• Welding time.

• Electrode force.

• Projection geometry.

• Electrode alignment.

• Surface condition.

Welding parameters must be developed through trials and validated for the actual assembly.

SUS304 and SUS316 Welding Considerations

Austenitic stainless steels have different electrical and thermal properties from carbon steel.

These differences can affect resistance welding behavior.

Engineering review should consider:

• Heat generation.

• Projection collapse.

• Electrode wear.

• Material condition.

• Thread distortion.

• Surface contamination.

• Welded joint strength.

• Corrosion performance after welding.

SUS304 and SUS316 should not automatically be assigned identical welding parameters.

Stainless Steel-to-Stainless Steel Welding

Stainless steel hex weld nuts may be welded to compatible stainless steel workpieces using a validated process.

The selected process must account for the actual material grades and workpiece thickness.

Where required, post-weld cleaning or surface restoration should be specified.

Stainless Steel-to-Carbon Steel Welding

Some applications may involve stainless steel weld nuts attached to carbon steel components.

This is a dissimilar-metal joining application.

Engineering considerations include:

• Welding process compatibility.

• Heat generation.

• Joint strength.

• Material interaction.

• Galvanic corrosion.

• Protective coating requirements.

The completed assembly must be validated.

Thread Integrity After Welding

Resistance projection welding can affect thread condition if the process is not properly controlled.

Possible issues include:

• Weld spatter.

• Thread distortion.

• Nut misalignment.

• Localized overheating.

• Poor bolt engagement.

Thread gauge inspection and appropriate post-weld checks may be required.

The welding process should not be described as automatically preserving thread precision under every condition.

Weld Strength and Torque Resistance

The completed welded attachment must meet the mechanical requirements of the assembly.

Depending on the application, relevant tests may include:

• Destructive torque testing.

• Push-off testing.

• Peel testing.

• Weld examination.

• Thread inspection.

• Application-specific durability testing.

The required test methods and acceptance criteria must be defined by the customer.

Corrosion Resistance After Welding

Stainless steel corrosion resistance depends on its passive surface condition.

Welding may produce heat tint, surface contamination or localized changes that affect corrosion performance.

Depending on the application, post-weld cleaning, surface restoration or passivation may be required.

For marine, food processing and chemical equipment, the complete welded assembly should be evaluated rather than relying solely on the stainless steel grade.

Plain Stainless Steel Surface Finish

Plain stainless steel is the specified surface condition for this product family.

Additional surface treatments may be evaluated according to customer requirements.

Possible processes include:

• Cleaning.

• Passivation.

• Surface finishing.

• Post-weld restoration.

The correct process depends on material grade, welding sequence and environmental requirements.

Automotive Stainless Steel Components

Automotive manufacturers may require stainless steel welded threaded attachments for selected components where corrosion resistance or material compatibility is important.

Potential applications include:

• Corrosion-sensitive mounting brackets.

• Stainless steel fabricated components.

• Vehicle body attachment interfaces.

• Equipment housings.

• Customer-engineered mounting structures.

Safety-critical automotive applications require specific OEM engineering approval and validation.

Electric Vehicle Equipment and Enclosures

Electric vehicle equipment may incorporate stainless steel brackets, housings and fabricated components.

DIN 929 stainless steel hex weld nuts can be evaluated where the workpiece material and resistance welding process are compatible.

Battery-related or safety-critical applications require application-specific qualification.

Electrical Cabinets and Power Distribution Equipment

Stainless steel electrical cabinets may require fixed threaded attachment points for internal mounting structures.

Potential applications include:

• Outdoor electrical enclosures.

• Power distribution cabinets.

• Industrial control panels.

• Stainless steel equipment brackets.

• Mounting structures.

Engineering requirements may include corrosion resistance, panel thickness, electrical continuity and welding accessibility.

Food Processing Equipment

Food processing machinery often uses stainless steel components.

SUS304 and SUS316 hex weld nuts may be evaluated for suitable non-product-contact equipment brackets, housings and mounting structures.

Where hygienic design or food-contact requirements apply, the complete assembly must meet the applicable customer specifications.

Surface finish, cleanability and welded joint geometry are important considerations.

Marine and Coastal Equipment

SUS316 hex weld nuts may be considered for selected marine and coastal equipment applications.

Potential uses include:

• Equipment enclosures.

• Stainless steel mounting brackets.

• Marine machinery housings.

• Fabricated support components.

Chloride exposure, crevice geometry and galvanic corrosion must be evaluated.

SUS316 is not automatically suitable for every marine environment.

Chemical Processing Equipment

Chemical processing equipment may require stainless steel threaded attachment points.

Material selection depends on chemical exposure, concentration, temperature and operating conditions.

SUS304 and SUS316 are not universally resistant to all chemicals.

Rail and Transportation Equipment

Stainless steel hex weld nuts may be considered for suitable fabricated transportation equipment components.

Mechanical, vibration, corrosion and welding requirements must be defined by the applicable engineering specification.

Industrial Machinery and Automation

Industrial equipment manufacturers may use stainless steel welded threaded attachments in:

• Equipment housings.

• Fabricated brackets.

• Machinery covers.

• Automated equipment structures.

• Stainless steel support panels.

The fastener must be selected according to the intended mechanical and environmental requirements.

HVAC and Outdoor Equipment

Stainless steel hex weld nuts may be evaluated for suitable HVAC enclosures, outdoor equipment and corrosion-sensitive mounting assemblies.

The workpiece material, coating system and welded joint requirements should be reviewed before production.

DIN 929 vs. DIN 928 vs. DIN 977

These products have different installation geometries.

They should not be substituted without engineering approval.

Cold Heading and Cold Forming Manufacturing

Juxin Fasteners supports cold heading and cold forming for suitable stainless steel hex weld nut designs.

Austenitic stainless steel requires careful consideration of:

• Material formability.

• Work hardening.

• Tooling design.

• Hexagonal body geometry.

• Locating pilot formation.

• Welding projection consistency.

• Dimensional tolerances.

The manufacturing route is selected according to the approved material and product design.

CNC Machining and Secondary Operations

CNC machining may be used for custom features, special dimensions or drawing-specific requirements.

Secondary operations may include:

• Internal thread manufacturing.

• Dimensional finishing.

• Cleaning.

• Passivation where specified.

• Inspection.

Not every DIN 929 weld nut requires CNC machining.

Custom OEM Stainless Steel Hex Weld Nuts

Juxin Fasteners supports customer-specific manufacturing based on 2D engineering drawings, 3D CAD models and technical specifications.

Custom options may include:

• SUS304 or SUS316 material.

• Metric coarse threads.

• Selected metric fine threads.

• Unified UNC or UNF threads.

• Hexagonal body dimensions.

• Nut height.

• Locating pilot diameter and height.

• Welding projection geometry.

• Mechanical property requirements.

• Surface finish.

• Inspection requirements.

• Packaging.

All custom designs are subject to engineering and manufacturing feasibility review.

Quality Inspection

Depending on the customer specification, inspection may include:

• Material grade verification.

• Chemical composition review.

• Thread gauge inspection.

• Hexagonal width across flats.

• Nut height.

• Locating pilot dimensions.

• Welding projection dimensions.

• Surface condition.

• Mechanical property testing.

• Welded joint testing.

• Corrosion testing where specified.

The inspection plan must follow the approved project requirements.

Production Manager Considerations

Production managers evaluating stainless steel hex weld nuts should consider:

• Material consistency.

• Welding equipment compatibility.

• Nut feeding and positioning.

• Pilot dimensional consistency.

• Welding projection consistency.

• Electrode maintenance.

• Welding cycle time.

• Thread condition after welding.

• Surface cleaning requirements.

• Production scrap and rework.

• Batch consistency.

• Packaging and delivery scheduling.

These factors influence production efficiency and assembly reliability.

Purchasing and Supplier Development Requirements

Purchasing managers and supplier development engineers should verify:

• DIN 929 standard edition.

• Approved engineering drawing.

• SUS304 or SUS316 material specification.

• Metric or Unified inch-thread designation.

• Thread pitch and tolerance.

• Hex body dimensions.

• Locating pilot dimensions.

• Welding projection geometry.

• Workpiece material and thickness.

• Welding process requirements.

• Mechanical properties.

• Surface finish.

• Weld strength acceptance criteria.

• Inspection requirements.

• Initial order quantity.

• Estimated annual demand.

• Delivery schedule.

Complete technical information supports accurate manufacturing feasibility review and quotation.

Relevant International Standards

Depending on the approved product configuration, the following standards may be relevant:

• DIN 929: Hexagon weld nuts.

• ISO 3506-2: Mechanical properties of applicable corrosion-resistant stainless steel nuts.

• ISO 261: ISO metric screw-thread general plan.

• ISO 724: Basic dimensions of ISO metric screw threads.

• ISO 965 Series: ISO metric screw-thread tolerances.

• ASME B1.1: Unified inch screw threads.

• ISO 4759-1: Tolerances for applicable fasteners.

• ISO 3269: Acceptance inspection of fasteners.

• ASTM A967/A967M: Chemical passivation treatments for stainless steel parts, where specified.

• ASTM A380/A380M: Cleaning, descaling and passivation practices for stainless steel, where applicable.

Reference to these standards does not independently establish certification or product conformity.

The approved customer drawing and technical specification remain controlling.

Frequently Asked Questions

What is a stainless steel DIN 929 hex weld nut?

It is a hexagonal stainless steel nut with welding projections and a locating pilot, designed for attachment to compatible metal components through resistance projection welding.

What stainless steel grades are available?

The specified materials are SUS304 and SUS316.

What is the difference between A2 and A4 stainless steel?

A2 is commonly associated with 304 stainless steel, while A4 is commonly associated with 316 stainless steel. 

A4 generally provides improved resistance to localized corrosion in certain chloride-containing environments.

What is the difference between DIN 929 and DIN 928?

DIN 929 covers hexagon weld nuts, while DIN 928 covers square weld nuts.

How many welding projections does a typical DIN 929 nut have?

The typical configuration uses three welding projections.

What is the purpose of the locating pilot?

The pilot assists positioning and alignment with the workpiece mounting hole.

What metric sizes does Juxin Fasteners offer?

The specified range includes M5, M6, M8, M10, M12, M14 and M16.

Are metric fine-thread configurations available?

Selected metric fine-thread configurations are included in the stated offering. Exact pitches and material-specific availability must be confirmed.

Can custom UNC and UNF stainless steel hex weld nuts be manufactured?

Juxin Fasteners supports engineering feasibility review for custom Unified inch-thread designs.

Are metric and Unified inch threads interchangeable?

No. The exact thread dimensions and tolerances must match the mating bolt.

Can stainless steel weld nuts be attached to carbon steel?

Dissimilar-metal welding may be feasible with a validated process, but mechanical and corrosion requirements must be reviewed.

Are stainless steel weld nuts corrosion-proof?

No. Corrosion resistance depends on material grade, environment, surface condition and assembly design.

Are hex weld nuts self-locking?

The welded nut is fixed to the workpiece, but its internal thread does not automatically provide prevailing-torque locking.

Can DIN 929 stainless steel weld nuts be used in automotive manufacturing?

Yes, where the approved design and welding process support the application.

Can Juxin Fasteners manufacture custom locating pilots and welding projections?

Yes. Custom geometry can be evaluated according to customer drawings and manufacturing feasibility.

Request a Quote — Stainless Steel DIN 929 Hex Weld Nuts

Juxin Fasteners is an industrial fastener manufacturer supporting automotive OEMs, Tier-1 and Tier-2 suppliers, stainless steel sheet metal fabricators, electrical equipment manufacturers, food processing equipment manufacturers, industrial machinery manufacturers, mechanical engineers, manufacturing engineers, production managers, purchasing managers and supplier development teams.

Our manufacturing capabilities include cold heading, cold forming, CNC machining where required and suitable secondary operations.

We support OEM/ODM fastener manufacturing, made-to-drawing production and industrial batch manufacturing.

Recommended RFQ Information

• 2D engineering drawing or 3D CAD model.

• DIN 929 standard reference and edition.

• SUS304 or SUS316 material specification.

• Metric or Unified inch-thread designation.

• Thread pitch and tolerance.

• Hexagonal body dimensions.

• Nut height.

• Locating pilot diameter and height.

• Welding projection geometry.

• Workpiece material and thickness.

• Welding process requirements.

• Mechanical property requirements.

• Surface finish and post-weld treatment.

• Weld strength acceptance criteria.

• Inspection and testing requirements.

• Sample requirements.

• Initial order quantity.

• Estimated annual demand.

• Packaging and delivery requirements.

Please send your engineering drawings and technical specifications for manufacturing feasibility review and quotation.

Juxin Fasteners

Industrial Fastener Manufacturer | Stainless Steel DIN 929 Hex Weld Nuts | A2/A4 Projection Weld Nuts | OEM/ODM Manufacturing | Made-to-Drawing Fasteners

Website: https://www.juxinfasteners.com/

Email: info@juxinfasteners.com

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.