Carbon Steel Top-Lock Distorted-Thread Hex Locknuts – DIN 980

Carbon Steel Top-Lock Distorted-Thread Hex Locknuts – DIN 980 All-Metal Prevailing-Torque Nuts

Vibration-Resistant Hexagon Locking Nuts for Industrial Machinery, Automotive Equipment and OEM Assemblies

JUXIN FASTENERS supplies carbon steel top-lock distorted-thread hex locknuts for industrial equipment manufacturers, 

automotive Tier-1 and Tier-2 suppliers, agricultural machinery manufacturers, heavy equipment producers and international OEM procurement teams.

These all-metal prevailing-torque nuts use controlled deformation of the upper internal thread region to create resistance against rotation on a compatible mating bolt.

In the American industrial fastener market, the product is commonly called a Top-Lock Distorted-Thread Locknut.

Related engineering and procurement terminology includes DIN 980 Lock Nuts, All-Metal Prevailing-Torque Hex Nuts, Deformed-Thread Locknuts and All-Metal Self-Locking Hexagon Nuts.

Unlike nylon-insert locknuts, the locking action is generated through metallic interference.

Unlike center-lock distorted-thread nuts, the locking feature is positioned toward the top of the nut.

This positioning allows the lower, undeformed thread region to guide the mating bolt before it reaches the locking section.

The product has a conventional hexagon exterior without an integrated flange.

JUXIN FASTENERS supports drawing-based OEM inquiries for carbon steel top-lock hex nuts with customer-specified dimensions, 

mechanical properties, surface treatments and prevailing-torque requirements.

Product Overview and Technical Specifications

Product Name: Carbon Steel Top-Lock Distorted-Thread Hex Locknuts

Primary American Industry Name: Top-Lock Distorted-Thread Locknuts

Alternative Industry Names:

• DIN 980 All-Metal Lock Nuts

• Top-Lock Hex Locknuts

• All-Metal Prevailing-Torque Hexagon Nuts

• Deformed-Thread Hex Locknuts

• Distorted-Thread Self-Locking Nuts

• Nylon-Free Hex Lock Nuts

Material: Carbon Steel

Original Listed Property Classes:

• Property Class 5

• Property Class 6

• Property Class 8

• Property Class 10

Original Listed Metric Sizes:

• M5

• M6

• M8

• M10

• M12

• M14

• M16

• M20

Original Listed Surface Treatment Options:

• Clear Zinc Plating

• Blue-Passivated Zinc Plating

• Yellow Zinc Plating

• Black Zinc Plating

• Zinc-Nickel Alloy Plating

• Zinc-Flake Coating

• Dacromet-Type Coating, Subject to Specification

Product Configuration: Non-Flanged Hexagon Nut

Locking Principle: Controlled Metallic Thread Deformation

Locking Position: Upper Internal Thread Region

Primary Historical Standard Reference: DIN 980

Related Standards for Engineering Review:

• ISO 7042

• ISO 7719

• ISO 10513

• ISO 2320

• ISO 898-2

Manufacturing Basis: Approved Engineering Drawings and Customer Specifications

The original product information lists several sizes, mechanical classes and coating options. Availability of each combination must be confirmed.

The exact applicable product standard depends on the nut geometry, height, thread pitch and property class.

What Is a Top-Lock Distorted-Thread Locknut?

A top-lock distorted-thread locknut is an all-metal prevailing-torque hexagon nut designed to resist unintended rotation.

The locking action is created by deliberately deforming a portion of the internal thread near the top of the nut.

When a compatible bolt passes through the nut, the distorted section creates interference with the mating thread.

This interference produces resistance to rotation.

The resistance is known as prevailing torque.

The locking feature helps resist unintended rotation under suitable operating conditions.

However, prevailing torque alone does not guarantee that a bolted joint will remain secure.

Correct bolt preload, joint stiffness, mating materials and installation procedures remain essential.

How the Top-Lock Distorted-Thread Mechanism Works

The locking mechanism relies on controlled metallic deformation.

During installation, the mating bolt first engages the undeformed lower threads.

These threads guide the bolt and establish alignment.

As the bolt advances into the upper locking region, the distorted threads contact the mating thread with additional interference.

This produces prevailing torque.

The locking resistance helps oppose unintended rotation.

Engineering Advantages of Top-Lock Positioning

The position of the locking feature can provide:

• Initial engagement through undeformed threads.

• Guided thread starting.

• Reduced risk of immediate locking interference at the entry face.

• Controlled locking resistance near the upper portion of the nut.

• Compatibility with selected automated assembly processes.

Actual installation behavior depends on the thread geometry, mating bolt and coating.

Top-Lock vs. Center-Lock Distorted-Thread Locknuts

Top-lock and center-lock distorted-thread nuts use related all-metal locking principles.

However, their locking locations differ.

Top-Lock Distorted-Thread Nuts

The locking feature is positioned near the top of the nut.

The bolt typically engages the lower threads before reaching the distorted section.

Center-Lock Distorted-Thread Nuts

The locking feature is positioned nearer the middle of the nut.

Some center-lock designs can be installed from either side.

Engineering Comparison

Important differences may include:

• Locking feature location.

• Installation direction.

• Thread starting behavior.

• Prevailing-on torque.

• Prevailing-off torque.

• Reuse performance.

• Nut geometry.

• Manufacturing process.

The two designs should not be substituted without checking the approved engineering requirements.

Top-Lock Distorted-Thread Nuts vs. Spring-Stop Locknuts

These products should not be confused.

Top-Lock Distorted-Thread Nuts

Use controlled deformation of the nut body or internal thread.

Spring-Stop Locknuts

Use an elastic metallic locking feature, such as spring prongs or a friction ring.

Key Difference

The top-lock distorted-thread nut generates interference through its deformed metallic thread geometry.

A spring-stop nut generates interference through an elastic spring feature.

Their locking behavior and reuse characteristics may differ.

Top-Lock Distorted-Thread Nuts vs. Nylon-Insert Locknuts

Nylon-insert locknuts use a polymer insert to generate locking resistance.

Top-lock distorted-thread nuts use metallic thread interference.

Potential Advantages of All-Metal Top-Lock Designs

• No nylon insert.

• Potential suitability for selected elevated-temperature applications.

• Metallic prevailing-torque locking.

• Compact conventional hexagon geometry.

• Compatibility with selected industrial vibration environments.

Important Limitations

The all-metal construction does not establish unlimited temperature capability.

Installation torque can be higher than for a conventional free-spinning nut.

Repeated installation may reduce locking performance.

The correct design must be selected according to the joint requirements.

Carbon Steel Material Selection

The original product information identifies carbon steel.

Carbon steel is widely used in industrial fastening applications because of its mechanical properties, manufacturability and cost characteristics.

Material selection should consider:

• Required property class.

• Mating bolt strength.

• Thread deformation process.

• Heat treatment.

• Fatigue performance.

• Coating requirements.

• Operating temperature.

• Corrosion exposure.

The selected material must provide both the required mechanical strength and the specified prevailing-torque performance.

Property Classes 5, 6, 8 and 10

The original product information lists four property classes.

These designations must be verified against the applicable nut standard.

Property Class 5

May be relevant to selected lower-strength fastening applications.

Property Class 6

May be relevant to certain general-purpose mechanical assemblies.

Property Class 8

Commonly associated with medium-strength metric steel fastening systems.

Property Class 10

May be selected for certain higher-strength bolted joints.

Important Engineering Requirement

Not every product standard includes every listed property class.

For example, a particular ISO prevailing-torque nut standard may specify a narrower set of mechanical classes.

The approved drawing must establish the correct combination of standard, material, dimensions and mechanical properties.

Mating Bolt Compatibility

The mating bolt must be compatible with the nut's:

• Thread size.

• Thread pitch.

• Mechanical property class.

• Locking interference.

• Coating.

• Installation requirements.

An excessively strong nut combined with an unsuitable mating bolt may increase the risk of thread damage.

Bolt compatibility should be determined from the applicable standards and joint engineering requirements.

DIN 980 Standard Reference

DIN 980 is a historical German standard for all-metal prevailing-torque hexagon nuts.

It addresses different types of metallic prevailing-torque construction.

DIN 980 Type V

Type V refers to a single-piece all-metal nut in which locking resistance is produced through deformation of the metallic nut structure.

This is particularly relevant to the top-lock distorted-thread product family.

DIN 980 Type M

Type M refers to a construction using an additional metallic prevailing-torque element.

This is not automatically the same construction as a single-piece distorted-thread nut.

Important Standard Note

DIN 980 should be interpreted together with the applicable drawing and standard edition.

A nut described commercially as DIN 980 must still be checked for dimensional and functional compliance.

ISO 7042, ISO 7719 and ISO 10513

These ISO standards relate to different configurations of prevailing-torque all-metal hexagon nuts.

They are not universal synonyms.

ISO 7042

A relevant standard reference for certain all-metal prevailing-torque hexagon nut configurations.

ISO 7719

A relevant standard reference for a different prevailing-torque hexagon nut configuration.

ISO 10513

A standard reference associated with high all-metal prevailing-torque hexagon nuts with metric fine-pitch threads.

The 2025 edition covers specified high-nut configurations and fine-pitch sizes.

Engineering Selection

Before listing a standard as applicable, verify:

• Nut height.

• Width across flats.

• Thread diameter.

• Thread pitch.

• Property class.

• Locking feature.

• Product grade.

• Standard edition.

A product should not be advertised as compliant with multiple standards solely because those standard numbers appeared in a historical catalog.

ISO 2320 Prevailing-Torque Performance

ISO 2320 provides functional requirements and test methods for prevailing-torque steel nuts.

Relevant performance characteristics include:

• Prevailing-on torque.

• Prevailing-off torque.

• Repeated installation performance.

• Proof-load-related requirements.

• Torque/clamp-force behavior.

Prevailing-On Torque

Prevailing-on torque is the resistance encountered when the nut advances along the mating bolt before significant clamp force develops.

Prevailing-Off Torque

Prevailing-off torque is the resistance encountered during removal after clamp force has been relieved.

Clamp Force

Clamp force is generated by bolt tension and compresses the joint components.

Important Engineering Principle

Prevailing torque is not equivalent to clamp force.

A secure joint requires the correct relationship between installation torque, friction and bolt preload.

Can Top-Lock Distorted-Thread Nuts Be Reused?

Repeated installation and removal may reduce the prevailing-torque locking performance.

Some catalog products are treated as non-reusable.

For OEM engineering, reuse must be determined from:

• Applicable standard requirements.

• Customer specifications.

• Remaining prevailing-off torque.

• Thread condition.

• Locking feature condition.

• Coating condition.

• Number of installation cycles.

• Joint criticality.

A nut should not be reused solely because it can still be threaded onto a bolt.

The approved maintenance specification should determine whether reuse is permitted.

Available Metric Thread Sizes

The original product range includes:

• M5

• M6

• M8

• M10

• M12

• M14

• M16

• M20

Common ISO metric coarse-thread designations for reference include:

• M5 × 0.8

• M6 × 1.0

• M8 × 1.25

• M10 × 1.5

• M12 × 1.75

• M14 × 2.0

• M16 × 2.0

• M20 × 2.5

These are reference thread designations.

The actual thread pitch and tolerance class must be confirmed for each ordered product.

Metric Fine-Pitch Options

Fine-pitch metric threads may be requested for selected OEM applications.

Examples of common metric fine-pitch designations include:

• M8 × 1.0

• M10 × 1.25

• M12 × 1.5

• M14 × 1.5

• M16 × 1.5

• M20 × 1.5

These are engineering reference examples, not confirmation that every size is available.

Fine-pitch designs must be evaluated against the actual product standard and manufacturing requirements.

Metric vs. UNC and UNF Threads

American industrial buyers may search for similar distorted-thread locknuts using UNC or UNF thread terminology.

However, the featured range is metric.

Metric, UNC and UNF threads are not directly interchangeable.

For example:

• M6 is not interchangeable with 1/4"-20 UNC.

• M8 is not interchangeable with 5/16"-18 UNC.

• M10 is not interchangeable with 3/8"-16 UNC.

Requests for inch-series locknuts must be evaluated separately.

Surface Treatment and Corrosion Protection

The original product range includes several coating options.

Coating selection should consider:

• Operating environment.

• Corrosion exposure.

• Coating thickness.

• Thread fit.

• Prevailing torque.

• Installation friction.

• Mechanical properties.

• Environmental compliance.

Clear Zinc Plating

Clear zinc plating provides corrosion protection in suitable industrial environments.

Blue-Passivated Zinc Plating

Blue-passivated zinc may be selected for customer-specified industrial coating requirements.

Yellow Zinc Plating

Yellow zinc finishes may be specified for selected applications.

The actual passivation chemistry and environmental compliance must be verified.

Black Zinc Plating

Black zinc finishes provide a dark appearance with corrosion protection determined by the complete coating system.

Zinc-Nickel Alloy Plating

Zinc-nickel coatings may be considered for applications requiring enhanced corrosion protection.

Actual performance depends on the coating specification.

Zinc-Flake Coating

Zinc-flake coatings may provide corrosion protection for selected industrial fasteners.

Coating thickness and friction characteristics must be compatible with the locking feature.

Dacromet-Type Coating

Dacromet-type systems are associated with particular zinc-flake coating technologies.

The actual coating chemistry and environmental compliance must be confirmed.

Relevant Coating Standards

• ISO 4042 for electroplated fastener coating systems.

• ISO 10683 for non-electrolytically applied zinc-flake coatings.

The required corrosion performance must be defined by the approved customer specification.

Coating Effects on Prevailing Torque

Top-lock distorted-thread nuts rely on controlled thread interference.

Coating thickness and surface friction can affect the locking behavior.

Potential effects include:

• Increased installation torque.

• Reduced thread clearance.

• Coating wear.

• Prevailing-torque variation.

• Mating thread damage.

• Reduced assembly consistency.

For OEM production, prevailing-torque testing should be performed on the finished coated component where required.

Industrial Applications and Engineering Solutions

1. Automotive Mechanical Assemblies

Automotive manufacturers may use all-metal locking nuts for selected vibration-exposed mechanical joints.

Potential applications include:

• Equipment brackets.

• Mechanical support assemblies.

• Auxiliary mounting hardware.

• Selected serviceable components.

Engineering Challenge

Vibration and dynamic loading may contribute to unintended fastener rotation.

Potential Solution

A top-lock distorted-thread hex nut may provide metallic prevailing-torque resistance where the joint design and customer specifications permit.

Safety-critical automotive joints require dedicated validation.

2. Industrial Machinery and Equipment

Industrial machinery contains numerous mechanical fastening points.

Potential applications include:

• Equipment frames.

• Mechanical brackets.

• Machine guards.

• Auxiliary mounting hardware.

Engineering Challenge

Repeated operation may affect joint retention.

Potential Solution

A top-lock all-metal hex nut may be evaluated as part of a properly designed bolted connection.

3. Agricultural Machinery

Agricultural equipment operates under vibration, dust and changing environmental conditions.

Potential applications include:

• Equipment supports.

• Implement accessories.

• Mechanical brackets.

• Auxiliary fastening assemblies.

Engineering Challenge

Vibration and environmental exposure can affect fastener reliability.

Potential Solution

A coated carbon steel top-lock nut may be evaluated according to the mechanical and corrosion requirements.

4. Heavy Equipment and Construction Machinery

Heavy equipment may experience shock loading and vibration.

Engineering Challenge

The joint may require resistance to unintended rotation.

Potential Solution

A suitable all-metal prevailing-torque hex nut may be considered where its mechanical properties and locking performance meet the approved design.

5. Rail and Transportation Equipment

Rail equipment may contain vibration-exposed mechanical assemblies.

Engineering Challenge

Repeated loading and maintenance requirements may affect joint selection.

Potential Solution

A specified top-lock nut may be evaluated where permitted by the relevant equipment requirements.

Rail-specific qualifications must be confirmed separately.

6. HVAC and Thermal Management Equipment

HVAC systems contain fans, pumps and mechanical supports.

Potential applications include:

• Fan brackets.

• Pump supports.

• Equipment frames.

• Auxiliary mounting hardware.

Engineering Challenge

Equipment vibration can affect threaded joints.

Potential Solution

A top-lock distorted-thread nut may provide locking resistance where the assembly requirements are satisfied.

7. Industrial Automation and Production Lines

Industrial automation equipment often includes vibration-exposed mechanical assemblies.

Engineering Challenge

The connection may require reliable retention and consistent installation performance.

Potential Solution

A top-lock hex nut may be evaluated with controlled prevailing torque and assembly procedures.

8. Electric Motors and Drive Equipment

Electric motors and drive systems may produce vibration.

Potential applications include:

• Equipment brackets.

• Mechanical support frames.

• Auxiliary mounting hardware.

Engineering Challenge

Repeated operating cycles can affect joint retention.

Potential Solution

An all-metal top-lock nut may be considered where the mechanical and temperature requirements permit.

9. Electrical Enclosures and Power Distribution Equipment

Electrical equipment manufacturers may require secure mechanical connections.

Potential applications include:

• Enclosure brackets.

• Mechanical support frames.

• Equipment mounting hardware.

Engineering Challenge

Vibration and thermal cycling may affect fastening performance.

Potential Solution

A suitable top-lock hex nut may be evaluated for mechanical fastening applications.

Electrical grounding and insulation requirements must be addressed separately.

10. AI Data Center Mechanical Infrastructure

AI data centers contain extensive mechanical equipment associated with cooling and power distribution.

Potential applications include:

• Cooling equipment brackets.

• Pump mounting hardware.

• Mechanical support frames.

• Auxiliary equipment assemblies.

Engineering Challenge

Continuous operation may create vibration in selected mechanical systems.

Potential Solution

A properly specified top-lock nut may be evaluated for suitable mechanical joints.

11. Renewable Energy Equipment

Renewable energy equipment may contain mechanical support assemblies exposed to environmental conditions.

Engineering Challenge

Vibration and corrosion exposure may affect fastener performance.

Potential Solution

A coated all-metal locking nut may be considered according to the approved mechanical and coating requirements.

12. General OEM Equipment Manufacturing

Potential applications include:

• Fabricated metal structures.

• Equipment supports.

• Mechanical brackets.

• Industrial enclosures.

• Serviceable equipment accessories.

Engineering Challenge

Conventional hex nuts may not provide the required locking resistance.

Potential Solution

A top-lock distorted-thread nut may be evaluated as an alternative locking system.

Installation and Assembly Engineering

Correct installation is essential for top-lock distorted-thread nuts.

Step 1: Verify the Mating Bolt

Confirm the thread size, pitch, property class and coating.

Step 2: Inspect the Nut

Check the threads and locking feature for damage.

Step 3: Identify the Installation Direction

Top-lock designs are generally installed from the undeformed thread entry side.

Step 4: Start the Threads Correctly

Engage the nut without cross-threading.

Step 5: Advance into the Locking Region

The distorted upper threads generate prevailing torque.

Step 6: Apply the Required Tightening Method

Use the approved torque or tensioning procedure.

Step 7: Verify the Joint

Confirm the required seating and fastening conditions.

Important Installation Considerations

• Avoid cross-threading.

• Use compatible mating bolts.

• Account for prevailing torque.

• Control installation friction.

• Verify adequate thread engagement.

• Inspect the locking feature where required.

• Follow approved reuse requirements.

Automated Assembly and Production Management

For production managers, top-lock nuts affect assembly efficiency and process control.

Important factors include:

• Nut orientation.

• Thread starting.

• Tool engagement.

• Prevailing-on torque.

• Final tightening torque.

• Assembly cycle time.

• Coating friction.

• Cross-threading prevention.

• Inspection.

• Rework.

• Repeat-order consistency.

The correct nut geometry and coating can support more consistent production assembly when properly validated.

Common Engineering Problems and Corrective Measures

Problem 1: Excessive Installation Torque

Possible causes include excessive locking interference, incompatible threads or coating friction.

Review the mating components and finished nut specification.

Problem 2: Insufficient Prevailing Torque

Possible causes include incorrect deformation geometry, wear or manufacturing variation.

Review the locking feature and functional test requirements.

Problem 3: Thread Damage

Possible causes include cross-threading or incompatible mating bolt properties.

Verify thread compatibility and installation procedures.

Problem 4: Inconsistent Clamp Force

Possible causes include friction variation or unsuitable tightening procedures.

Review the actual torque/clamp-force relationship.

Problem 5: Coating Damage

Possible causes include excessive friction or unsuitable installation conditions.

Review the coating specification and assembly process.

Problem 6: Corrosion

Possible causes include inadequate coating selection or environmental exposure.

Review the required corrosion protection system.

Problem 7: Reduced Reuse Performance

Possible causes include thread wear or changes in the locking feature.

Review the permitted installation cycles and prevailing-torque requirements.

Problem 8: Joint Loosening

Possible causes include inadequate preload, joint settlement or insufficient locking performance.

Evaluate the complete bolted joint.

Quality Inspection and Functional Validation

Quality requirements should follow the approved drawing and customer specification.

Dimensional Inspection

Potential characteristics include:

• Thread diameter.

• Thread pitch.

• Nut height.

• Width across flats.

• Thread entry geometry.

• Locking feature geometry.

• Critical dimensional tolerances.

Material Verification

Confirm the specified carbon steel and applicable mechanical requirements.

Mechanical Property Testing

Verify the required nut property class and proof-load-related requirements.

Prevailing-Torque Testing

Depending on the applicable specification, testing may include:

• Prevailing-on torque.

• Prevailing-off torque.

• Repeated installation performance.

• Torque/clamp-force behavior.

Coating Inspection

Potential requirements include:

• Coating type.

• Coating thickness.

• Surface appearance.

• Corrosion resistance.

• Friction characteristics.

• Environmental compliance.

Functional Assembly Validation

Depending on the application, customer testing may include:

• Mating bolt compatibility.

• Installation torque.

• Locking performance.

• Vibration resistance.

• Temperature exposure.

• Corrosion exposure.

• Joint retention.

These are potential customer-defined validation requirements, not claims that every test is routinely performed on every production lot.

OEM Quality Documentation

Depending on customer requirements, documentation may include:

• Approved engineering drawings.

• Material specifications.

• Dimensional inspection reports.

• Mechanical property reports.

• Prevailing-torque test reports.

• Coating specifications.

• Corrosion test reports.

• First article inspection.

• Production traceability.

• Process control records.

• PPAP documentation where applicable.

• Engineering change control.

Specific certifications and approvals must be supported by the appropriate records.

Custom Top-Lock Distorted-Thread Hex Nuts to Engineering Drawings

JUXIN FASTENERS supports OEM inquiries for standard-based and customer-specific top-lock distorted-thread hex nuts.

Custom requirements may include:

• Metric thread size.

• Thread pitch.

• Nut height.

• Width across flats.

• Property class.

• Locking feature geometry.

• Prevailing-torque requirements.

• Coating specification.

• Corrosion resistance.

• Friction requirements.

• Installation conditions.

• Quality documentation.

• Packaging.

• Production volume.

Manufacturing feasibility and quotation depend on the approved technical requirements.

Frequently Asked Engineering Questions

What is a top-lock distorted-thread locknut?

It is an all-metal hexagon nut with a distorted upper thread region that creates prevailing torque on a compatible bolt.

What is the American name for this product?

Top-Lock Distorted-Thread Locknut is a recognized American industrial catalog name.

Is this product a flange nut?

No. The featured product is a conventional non-flanged hexagon locknut.

What is DIN 980?

DIN 980 is a historical German standard for all-metal prevailing-torque hexagon nuts.

What is DIN 980V?

DIN 980 Type V refers to a single-piece metallic locking nut that uses deformation to generate prevailing torque.

Are top-lock and center-lock nuts the same?

No. Their locking features are positioned differently.

Are top-lock nuts the same as spring-stop nuts?

No. Spring-stop designs use elastic metallic locking elements, while top-lock distorted-thread nuts use controlled thread deformation.

Can top-lock distorted-thread nuts be reused?

Reuse depends on the product specification, remaining prevailing torque and customer requirements.

What property classes are listed?

The original product range lists Classes 5, 6, 8 and 10, subject to verification against the applicable standard.

What sizes are listed?

M5, M6, M8, M10, M12, M14, M16 and M20.

What surface treatments are available?

The original range includes zinc, zinc-nickel and zinc-flake coating options, subject to specification.

Are these nuts suitable for vibration-exposed machinery?

They may be suitable for selected applications when the complete joint is properly designed and validated.

Are top-lock nuts suitable for high temperatures?

All-metal designs may be considered for selected elevated-temperature applications, but actual temperature capability must be verified.

What is prevailing torque?

Prevailing torque is rotational resistance produced by the locking feature before significant clamp force develops.

Can metric top-lock nuts be used on UNC bolts?

No. Metric and UNC threads are not directly interchangeable.

Can JUXIN FASTENERS evaluate custom DIN 980 nut drawings?

Yes. Customer-specific requirements can be reviewed according to the supplied drawings and production specifications.

What information is required for an OEM quotation?

A dimensioned drawing, material specification, thread size, property class, locking feature design, coating requirements and estimated annual quantity provide a useful basis for technical review.

Request a Custom DIN 980 Top-Lock Distorted-Thread Hex Nut RFQ

JUXIN FASTENERS supports OEM sourcing and technical inquiries for carbon steel top-lock distorted-thread hex nuts, DIN 980 all-metal lock nuts and specialized prevailing-torque fasteners.

For a new OEM program or an existing production component, please provide:

• 2D engineering drawing or 3D CAD file.

• Required product standard and edition.

• Metric thread size and pitch.

• Required property class.

• Mating bolt specification.

• Nut height and width across flats.

• Locking feature geometry.

• Prevailing-on torque requirements.

• Prevailing-off torque requirements.

• Reuse cycle requirements, if applicable.

• Surface coating specification.

• Corrosion resistance requirements.

• Friction requirements.

• Operating temperature and service environment.

• Quality and inspection requirements.

• Initial order quantity.

• Estimated annual production demand.

• Target delivery schedule.

Our team can review the technical specifications and discuss engineering clarification, manufacturing feasibility and quotation.

JUXIN FASTENERS

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

Email: info@juxinfasteners.com

Submit Your Engineering Drawings for a Custom DIN 980 Top-Lock Distorted-Thread Hex Nut RFQ.

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.