Brass Nylon-Insert Hex Flange Lock Nuts – DIN 6926 Style

Brass Nylon-Insert Hex Flange Lock Nuts – DIN 6926 Style

JUXIN FASTENERS supplies brass nylon-insert hex flange lock nuts for industrial OEM fastening applications requiring corrosion resistance, 

controlled prevailing-torque locking action and a wider bearing surface.

These fasteners combine a brass hexagonal nut body, an integrated flange and a non-metallic nylon locking insert. 

The nylon insert creates resistance to rotational loosening, while the flange distributes bearing loads across a larger contact area.

Common industrial search terms include brass nylon insert flange lock nuts, brass nyloc flange nuts, brass hex flange locknuts, 

brass prevailing torque nuts, vibration-resistant brass locknuts and DIN 6926-style brass flange nuts.

JUXIN supports OEM manufacturers, Tier-1 and Tier-2 suppliers, equipment builders, mechanical engineers, 

production managers and global procurement teams requiring standard or drawing-based brass fastening components.

Product Specifications

Important Engineering Note

DIN 6926 and ISO 7043 are commonly associated with steel prevailing-torque hex flange nuts.

A brass version may follow the dimensional concept of these standards, but it must not automatically be represented as fully compliant with their steel mechanical property classes.

Brass mechanical properties, proof-load capability and prevailing-torque performance must be established through the approved material specification and customer requirements.

Brass Material Properties and Engineering Advantages

Brass is a copper-zinc alloy widely used in industrial fastening applications requiring corrosion resistance, electrical conductivity, thermal conductivity and good machinability.

The actual properties depend on the brass alloy, chemical composition, manufacturing condition and processing method.

Corrosion Resistance

Brass generally offers good resistance to atmospheric corrosion and many ordinary indoor industrial environments.

It is often selected where resistance to red rust is desirable.

However, brass is not universally resistant to aggressive chemicals, ammonia-containing environments, seawater or all industrial cleaning agents.

Engineers must consider dezincification, stress corrosion cracking and galvanic compatibility where applicable.

Electrical Conductivity

Brass is electrically conductive and may be suitable for selected electrical equipment and mechanical fastening applications.

However, the presence of a nylon insert does not establish electrical isolation of the complete fastener.

Likewise, a brass nut does not automatically provide a qualified electrical bonding connection.

Electrical current-carrying and grounding applications require separate engineering verification.

Thermal Conductivity

Brass provides higher thermal conductivity than many conventional carbon steels.

This can be useful in selected mechanical assemblies where heat transfer through metallic components is relevant.

However, the nylon insert introduces a separate temperature limitation and must be evaluated independently.

Machinability

Suitable brass grades offer good machinability, supporting controlled thread production, dimensional accuracy and custom fastening geometries.

For drawing-based OEM applications, the selected alloy and manufacturing process should be matched to mechanical and dimensional requirements.

Common Brass Material Grades

Brass fasteners may be manufactured from different copper-zinc alloys depending on regional material specifications and production requirements.

Examples include:

• CW614N / CuZn39Pb3: A commonly used free-machining brass grade in European specifications.

• C36000: A widely recognized North American free-cutting brass alloy.

• CuZn40 and other specified brass alloys: Potential alternatives subject to mechanical and manufacturing requirements.

Material designations such as H59 or H62 may appear in supplier specifications, but they must not be treated as automatically equivalent to European or North American alloys.

The actual material grade, chemical composition, lead content and regulatory requirements must be verified before production.

DIN 6926-Style Metric Sizes

JUXIN FASTENERS offers brass nylon-insert flange lock nut inquiries in the following metric sizes:

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

The following table lists the corresponding standard metric coarse-thread pitches.

These values identify standard metric coarse-thread pitches.

Final flange diameter, overall height, width across flats, thread tolerance and nylon insert geometry must follow the approved brass product drawing.

DIN 6926 and ISO 7043 Dimensional Considerations

DIN 6926 and ISO 7043 provide useful references for the dimensional configuration of nylon-insert hex flange nuts.

ISO 7043:2012 specifies metric coarse-thread prevailing-torque hex flange nuts with non-metallic inserts in sizes M5 through M20 and steel property classes 8, 9 and 10.

These steel mechanical property classes must not be assigned to brass nuts without an independently applicable specification.

For brass variants, dimensions may be developed using the relevant flange geometry while defining separate material, strength and locking-performance requirements.

Customers requiring dimensional interchangeability should provide the applicable standard edition and approved engineering drawing.

UNC and UNF Inch-Series Brass Nylon-Insert Lock Nuts

North American industrial procurement frequently uses Unified National Coarse (UNC) and Unified National Fine (UNF) threads.

Brass nylon-insert lock nuts are available in the American industrial market in various UNC and UNF configurations.

However, standard brass nylon-insert hex nuts and brass nylon-insert hex flange nuts are different product configurations.

For a flanged brass version, the required geometry and manufacturing feasibility must be confirmed separately.

Common Inch-Series Thread References

These are engineering reference thread designations for sourcing and customization inquiries. They do not represent confirmed inventory for every brass flange nut configuration.

Metric and UNC/UNF threads are not interchangeable.

Customers requiring inch-series brass flange lock nuts should provide the exact thread designation, flange dimensions, material specification, mechanical requirements and applicable drawing.

How Brass Nylon-Insert Flange Lock Nuts Resist Loosening

The nylon insert is positioned near the upper portion of the nut.

During installation, the mating bolt thread enters the nylon insert and produces controlled interference.

The nylon deforms around the mating thread, generating frictional resistance to relative rotation.

This prevailing-torque mechanism helps resist rotational loosening caused by vibration and repeated mechanical movement.

The integrated flange provides a broader bearing surface than a conventional hex nut without a washer.

Key Engineering Benefits

• Prevailing-torque resistance to rotational loosening.

• Brass body with good atmospheric corrosion resistance.

• Integrated flange for broader bearing-load distribution.

• Potential reduction in separate washer handling.

• Good machinability for custom fastening designs.

• Electrical and thermal conductivity where relevant.

• Compatibility with drawing-based OEM manufacturing programs.

• Availability of different metric thread configurations.

Prevailing torque does not replace proper joint preload.

Severe vibration, transverse loading, joint separation or insufficient clamp force can still result in loosening or fastening failure.

Brass vs. Carbon Steel vs. Stainless Steel Nylon-Insert Lock Nuts

Brass Nylon-Insert Lock Nuts

Brass offers corrosion resistance, electrical conductivity, thermal conductivity and good machinability.

It is often considered for selected electrical equipment, plumbing-related machinery, instrumentation and general industrial assemblies.

Mechanical strength is typically lower than that of high-strength steel fasteners, depending on the selected alloys and conditions.

Carbon Steel Nylon-Insert Lock Nuts

Carbon steel versions are commonly selected for industrial applications requiring specified mechanical property classes and higher proof-load capability.

Protective coatings such as zinc plating may be required for corrosion resistance.

Stainless Steel Nylon-Insert Lock Nuts

Stainless steel versions may be preferred for applications requiring enhanced corrosion resistance, depending on the grade and environment.

Material selection should account for mechanical strength, galvanic compatibility, operating temperature and cost.

Engineering Selection

Brass should not be selected solely because it resists red rust.

The correct material depends on joint load, service environment, corrosion exposure, mating fastener material, electrical requirements and maintenance conditions.

Industrial Applications & Engineering Solutions

1. Automotive Fastening Systems

Brass nylon-insert flange lock nuts may be considered for selected non-safety-critical automotive accessories, auxiliary brackets, instrumentation equipment and specialized mechanical assemblies.

The nylon insert provides resistance to rotational loosening, while the flange distributes bearing loads.

Automotive engineers should evaluate vibration, temperature, mechanical loads and galvanic compatibility with mating components.

Brass versions should not be substituted for specified high-strength steel lock nuts in structural or safety-critical automotive joints.

2. Electric Vehicles and EV Battery Pack Equipment

Potential applications include selected battery enclosure accessories, auxiliary equipment brackets, instrumentation supports and non-critical mechanical assemblies.

Brass conductivity may be useful in some electrical equipment designs, but the complete fastening arrangement must be evaluated for electrical safety.

For EV battery systems, engineers must consider electrical isolation, current-carrying requirements, thermal exposure, corrosion and vibration.

Ordinary brass nylon-insert flange lock nuts are not automatically suitable for high-voltage electrical terminals, critical battery retention or high-temperature battery components.

3. Rail Transit and Railway Equipment

Potential applications include selected railway interior equipment, instrumentation brackets, electrical cabinet accessories and non-critical mechanical assemblies.

Railway environments introduce vibration, thermal cycling, corrosion and fire-safety requirements.

The nylon insert may require evaluation against applicable railway fire-performance specifications.

Safety-critical railway fastening systems require approved materials and engineering validation.

4. Aerospace Ground Support and Aviation Equipment

Brass nylon-insert flange lock nuts may be considered for approved non-flight-critical ground support equipment, maintenance fixtures, workshop machinery and auxiliary industrial applications.

Aircraft-installed fasteners require approved aerospace specifications, traceability and engineering authorization.

A DIN 6926-style brass industrial lock nut must not be represented as an aerospace-certified replacement.

5. Electrical Cabinets and Power Distribution Equipment

Brass fasteners may be used in selected electrical cabinet accessories, instrument housings, control panel structures and auxiliary mechanical mounting systems.

Brass provides electrical conductivity and good resistance to atmospheric corrosion.

However, electrical bonding, grounding continuity and current-carrying capability must be independently verified.

The nylon insert is a locking component and does not automatically establish electrical insulation or an approved grounding connection.

6. HVAC and Ventilation Equipment

Potential applications include suitable HVAC instrumentation, auxiliary equipment brackets, ventilation control assemblies and mechanical mounting hardware.

Brass may be useful where atmospheric corrosion resistance is desirable.

Engineers should evaluate moisture exposure, temperature, vibration and compatibility with surrounding metals.

7. Industrial Machinery, Pumps and Valves

Brass nylon-insert flange lock nuts may be considered for selected pump accessories, valve equipment, machinery brackets, instrument mounts and non-critical mechanical assemblies.

Brass is commonly used in fluid-handling equipment, but the suitability of a nylon-insert lock nut depends on the actual operating environment.

Pressure-retaining, high-load or safety-critical joints require separately approved fastening specifications.

8. Robotics and Industrial Automation

Potential applications include instrumentation brackets, automation equipment accessories, sensor mounts and auxiliary mechanical structures.

The prevailing-torque mechanism may help resist rotational loosening in suitable vibration-exposed assemblies.

For moving equipment, engineers must evaluate fatigue, joint preload, mechanical loading and maintenance requirements.

9. Sheet Metal Fabrication and Metal Enclosures

The integrated flange provides a wider bearing surface for suitable sheet-metal brackets, enclosure frames and fabricated components.

Design engineers should evaluate sheet thickness, hole size, edge distance, local deformation and mating surface compatibility.

Where blind-side installation is required, blind rivet nuts or self-clinching fasteners may be more appropriate.

10. Construction Machinery and Mining Equipment

Brass nylon-insert flange lock nuts may be evaluated for selected auxiliary components, instrumentation mounts and corrosion-sensitive accessories.

Heavy construction and mining equipment frequently requires high mechanical strength and severe-vibration performance.

Standard brass lock nuts should not replace specified high-strength steel fasteners in structural, load-bearing or safety-critical joints without engineering approval.

11. Medical Equipment and Laboratory Machinery

Potential applications include approved non-patient-contact instrument brackets, laboratory machinery frames, equipment enclosures and auxiliary mechanical components.

Engineers must consider cleanliness, chemical exposure, material composition, corrosion resistance and applicable regulatory requirements.

Leaded brass alloys may be unsuitable for applications with strict lead-content restrictions.

Ordinary brass nylon-insert lock nuts are not inherently medical-grade, sterile or suitable for implantable applications.

12. Agricultural and Textile Machinery

Potential applications include selected instrument mounts, equipment accessories, protective covers and non-critical mechanical assemblies.

Brass corrosion resistance and machinability may be useful where the operating environment and mechanical loads permit.

Engineers should verify vibration, contamination exposure, temperature and maintenance requirements.

Installation and Assembly Engineering Guidelines

Thread Compatibility

Confirm the correct thread diameter, pitch, tolerance and mating bolt specification.

Metric coarse, metric fine, UNC and UNF thread systems must not be mixed.

Tightening Torque and Joint Preload

The nylon insert generates prevailing torque during installation.

The tightening procedure must account for both prevailing torque and the torque required to establish the intended clamp load.

Brass threads may have lower stripping resistance than high-strength steel threads.

Excessive tightening can damage the brass thread or deform the nut.

Installation torque must be established using the approved brass material specification, mating bolt and joint design.

Nylon Insert Engagement

The mating bolt must sufficiently engage the nylon insert to establish the required locking function.

Thread engagement and bolt protrusion should follow the approved assembly specification.

Reusability

Nylon-insert lock nuts may be reusable when permitted by the relevant specification and when prevailing-torque performance remains acceptable.

Repeated installation can reduce locking resistance.

Nuts with damaged inserts, distorted brass threads or insufficient prevailing torque should be replaced.

Operating Temperature

The nylon insert limits the permissible service temperature of the complete fastening system.

Temperature capability depends on the actual nylon grade, operating duration, loading and environmental conditions.

The previously stated -50°C to +100°C range should not be treated as a guaranteed rating without material and performance verification.

Galvanic Corrosion

Brass may form galvanic couples with dissimilar metals in the presence of moisture or conductive electrolytes.

The complete joint should be evaluated when brass fasteners are installed against aluminum, carbon steel or other dissimilar materials.

Flange Bearing Surface

Ensure that the flange seats correctly against the mating surface.

Check for burrs, excessive hole clearance, local deformation and interference with adjacent components.

The flange does not automatically replace a hardened washer or specialized bearing arrangement in every application.

OEM Quality Control and Inspection Requirements

For repeatable industrial production, quality planning may include:

• Brass alloy identification and chemical composition verification.

• Material mechanical property verification.

• Thread gauge inspection.

• Width-across-flats dimensional inspection.

• Overall height and flange diameter verification.

• Nylon insert integrity and retention inspection.

• Prevailing-torque testing against approved requirements.

• Surface condition and appearance inspection.

• Corrosion testing where specified.

• Lead-content and restricted-substance verification where applicable.

• Lot identification and production traceability.

• Packaging and shipment inspection.

Inspection methods, sampling plans and acceptance criteria should follow the approved drawing, material specification and customer purchase requirements.

DIN 6926, ISO 7043 and Related Standards

DIN 6926

A widely recognized metric designation for nylon-insert hex flange lock nuts, primarily associated with steel product configurations.

ISO 7043

An international standard covering metric coarse-thread prevailing-torque hexagon nuts with flange and non-metallic inserts, with specified steel property classes.

DIN EN 1663

A European standard associated with metric coarse-thread prevailing-torque hex flange nuts with non-metallic inserts.

ISO 12125

An international standard for specified metric fine-thread prevailing-torque hex flange nuts with non-metallic inserts.

DIN EN 1666

A European fine-thread nylon-insert hex flange nut specification.

ASME B18.16.6

A United States standard covering specified inch-series prevailing-torque lock nut configurations.

Its application to a particular brass flange nut must be verified against the relevant product scope and approved drawing.

NF E 25-413, NF E 25-506 and NF E 25-507

French national standard references encountered in fastener specifications.

Their exact scope, edition and applicability to the requested brass nut must be confirmed before claiming compliance or dimensional equivalence.

Important Standards Note

These standards are not universally interchangeable.

A brass DIN 6926-style lock nut should be specified using an approved combination of dimensional requirements, brass material properties, thread tolerances and prevailing-torque performance criteria.

Custom OEM Brass Nylon-Insert Flange Lock Nut Solutions

JUXIN FASTENERS supports technical review of standard and customized brass fastening requirements.

Potential customization areas include:

• Metric coarse and fine-thread configurations.

• UNC and UNF inch-series inquiries.

• Customer-specified brass alloy grades.

• Customized flange dimensions.

• Special nut heights and wrenching geometry.

• Application-specific nylon insert requirements.

• Customer-defined prevailing-torque performance.

• Surface finish and corrosion requirements.

• Material composition and restricted-substance documentation.

• Industrial bulk packaging.

• Drawing-based OEM production programs.

Custom configurations are subject to technical feasibility, tooling requirements, order quantity and approval of the final manufacturing drawing.

Frequently Asked Questions

What is a brass nylon-insert hex flange lock nut?

It is a brass hexagonal flange nut with a non-metallic nylon locking insert. 

The insert produces prevailing torque against the mating bolt thread, while the flange provides a broader bearing surface.

Is a brass nylon-insert flange lock nut fully compliant with DIN 6926?

Not automatically. DIN 6926 and related ISO specifications are primarily associated with steel configurations. 

Brass versions may use similar dimensions but require separately defined material and mechanical performance requirements.

Are brass nylon-insert lock nuts high-strength fasteners?

Brass lock nuts should not automatically be described as high-strength fasteners. 

Their strength depends on the selected brass alloy, manufacturing condition and approved mechanical requirements.

What are the advantages of brass compared with carbon steel?

Brass offers good atmospheric corrosion resistance, electrical conductivity, thermal conductivity and machinability. 

Carbon steel may provide higher mechanical strength depending on the grade.

Can brass nylon-insert lock nuts be used in electrical equipment?

Yes, in appropriately engineered applications.

 Electrical bonding, current-carrying capability and insulation requirements must be evaluated separately.

Can metric brass lock nuts replace UNC or UNF nuts?

No. Metric and Unified thread systems are not interchangeable.

Are brass nylon-insert flange lock nuts suitable for outdoor use?

Suitability depends on the brass alloy, environmental exposure, mating materials and corrosion requirements. 

Aggressive chemical or marine environments require additional evaluation.

Can these lock nuts be reused?

Reuse may be possible when permitted by the approved specification and when the nylon insert and brass threads continue to meet the required performance criteria.

What is the operating temperature range?

The allowable temperature depends on the nylon insert grade, brass material and complete joint design.

 A specific temperature rating must be verified for the supplied configuration.

What information is required for an OEM quotation?

Customers should provide the thread designation, brass alloy, dimensions, prevailing-torque requirements, operating conditions, quantity and engineering drawings where available.

Request a Quote – Brass Nylon-Insert Hex Flange Lock Nuts

JUXIN FASTENERS supplies industrial fastening components for OEM manufacturers, 

Tier-1 and Tier-2 suppliers, equipment manufacturers, engineering teams, production managers and global procurement organizations.

For an accurate technical and commercial quotation, please provide:

1. Required metric or UNC/UNF thread designation.

2. Brass material grade or chemical composition requirements.

3. Applicable dimensional standard or approved drawing.

4. Flange dimensions, nut height and thread tolerances.

5. Nylon insert and prevailing-torque requirements.

6. Operating temperature and environmental conditions.

7. Required surface finish and compliance documentation.

8. 2D engineering drawings or 3D CAD files, if available.

9. Estimated annual consumption and order quantity.

10. Packaging, inspection and delivery requirements.

Our team can review standard and customized brass fastener requirements and provide technical quotation support for suitable industrial production programs.

Email: info@juxinfasteners.com

Website: www.juxinfasteners.com

JUXIN FASTENERS – Industrial Brass Lock Nuts, OEM Fastening Components and Custom Engineered Fastener Solutions.

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.