Black Anodized 6061 Aluminum Nylon-Insert Hex Flange Lock Nuts

Black Anodized 6061 Aluminum Nylon-Insert Hex Flange Lock Nuts – Custom OEM Manufacturing & Industrial Fastening Solutions

JUXIN FASTENERS is an industrial fastener manufacturer specializing in standard and custom-engineered fastening components for international OEM, Tier-1 and Tier-2 manufacturing programs.

Our black anodized 6061 aluminum nylon-insert hex flange lock nuts combine a lightweight aluminum alloy body, a non-metallic prevailing-torque locking insert and an integrated flange bearing surface.

Available in the listed metric sizes M2, M2.5, M3, M4, M5, M6 to M16, these fasteners may be considered for suitably engineered lightweight mechanical assemblies, 

bicycle accessories, mountain bike equipment, racing accessories, robotics, precision machinery and industrial equipment.

The black anodized appearance is particularly relevant to OEM products requiring coordinated black hardware, discreet visible fasteners or consistent external component finishes.

JUXIN FASTENERS also supports OEM/ODM custom manufacturing, drawing-based production and industrial batch orders.

Our broader manufacturing capabilities combine cold heading, cold forming and CNC machining with product-specific secondary manufacturing operations, 

allowing us to support a wide range of industrial fasteners and precision components.

1. Product Specifications

The exact flange dimensions, nut height, thread tolerance, material temper, insert specification and functional acceptance criteria must be established through the approved product drawing.

2. What Is a Black Aluminum Nylon-Insert Flange Lock Nut?

A nylon-insert flange lock nut is a fastening component that incorporates a polymer locking insert near the upper portion of the nut.

As a mating bolt engages the nylon insert, controlled interference produces prevailing torque.

This helps resist rotational loosening under appropriate joint conditions.

The integrated flange provides a bearing surface beneath the nut and may reduce the need for a separate washer where the joint design permits.

The black version uses a 6061 aluminum alloy body with a black anodized finish.

Black anodizing does not make the nut mechanically equivalent to a high-strength steel lock nut.

The suitability of the product depends on the actual mechanical requirements, material condition, thread geometry and assembly design.

3. Why Choose 6061 Aluminum for Lightweight Fastening?

6061 aluminum is a magnesium-silicon aluminum alloy commonly used in engineered lightweight components.

Its relatively low density can be beneficial in selected equipment where reducing mass is important.

For equivalent solid metal volume, aluminum is approximately 65% lighter than carbon steel.

The weight difference between actual finished nuts depends on their dimensions and construction.

Potential Advantages

• Low material density.

• Good machinability.

• Compatibility with specified anodizing processes.

• Lightweight fastening design.

• Custom dimensional manufacturing possibilities.

• Coordinated appearance with black industrial components.

Material Strength and Temper

The 6061 alloy designation alone does not confirm the temper or mechanical strength.

For example, 6061-T6 is a specific material condition and must not be assumed without verification.

Aluminum lock nuts may have lower thread stripping resistance and load capacity than steel lock nuts of similar nominal dimensions.

The required material temper, thread strength, installation torque and functional performance must be established by the OEM engineering specification.

4. Black Anodizing for Industrial OEM Equipment

Black anodizing is widely relevant to the appearance requirements of engineered aluminum products.

For OEM fastening applications, it can provide a coordinated black surface appearance alongside machined aluminum housings, instrument brackets, bicycle accessories and equipment components.

Anodizing forms an oxide layer on the aluminum surface.

Its performance depends on the specified process, coating thickness, sealing and operating environment.

Black Anodizing vs. Black PVD

Black anodizing and black Physical Vapor Deposition (PVD) are different finishing processes.

The historical product description contains both terms, but that does not confirm that this particular lock nut receives both treatments.

For this page, the finish is identified as black anodizing. Any additional PVD process must be separately confirmed.

Black Anodizing vs. Black Zinc Plating

Black anodizing is used on aluminum and differs from black zinc or black zinc-nickel plating typically specified for steel components.

These finishes must not be treated as interchangeable.

OEM Black Color Consistency

Black finishes can vary in gloss, shade and surface texture.

For appearance-sensitive OEM manufacturing, customers should specify:

• Approved black color reference.

• Matte, satin or glossy appearance requirements.

• Surface preparation.

• Anodizing thickness.

• Sealing requirements.

• Cosmetic acceptance criteria.

• Scratch and handling limits.

• Color consistency between production batches.

• Packaging protection.

A black color description alone does not establish a particular gloss level or coating performance.

5. Metric Thread Sizes M2–M8

The inch values are nominal diameter conversions only.

They do not indicate thread interchangeability.

M2–M3

Potential applications include compact instrumentation, miniature robotics, RC racing accessories and small equipment assemblies.

M4–M5

Potential applications include selected bicycle accessory brackets, precision equipment mounts and lightweight industrial components.

M6–M8

Potential applications include suitable machinery accessories, equipment covers and approved non-critical mounting assemblies.

Each application requires verification of joint load, thread engagement and installation conditions.

6. UNC and UNF Inch-Series References for American OEM Customers

US manufacturers may require custom lock nuts with UNC or UNF threads.

The following designations are provided for engineering reference and custom manufacturing inquiries.

These are common thread references, not a confirmed list of stocked or previously manufactured black aluminum locknut sizes.

Custom inch-series production is subject to drawing review and manufacturing feasibility.

Metric and inch-series threads are not interchangeable.

For example, M6 × 1.0 and 1/4-20 UNC use different thread specifications and must not be substituted for one another.

The same caution applies to UNC, UNF, BSW and BSF systems.

7. Nylon Insert Locking Mechanism

The nylon insert creates interference with the mating bolt thread during assembly.

This generates prevailing torque, which helps resist rotation.

Important Engineering Distinctions

Prevailing torque is not the same as joint preload.

The nylon insert does not automatically prevent joint separation, fatigue failure or loss of clamp load.

The correct tightening procedure must account for the locking resistance and the required joint preload.

Assembly Torque

Aluminum threads may be damaged by excessive tightening.

Installation torque should be determined from the approved joint design, actual aluminum temper, mating bolt and operating conditions.

Steel locknut torque values must not be transferred directly to aluminum components.

Temperature Limitations

The nylon insert's allowable service temperature depends on its material grade and application conditions.

A universal -50°C to +100°C operating range cannot be guaranteed without supporting test evidence.

Reuse

Repeated assembly may reduce prevailing torque.

Reuse should be permitted only when the approved specification and functional condition allow it.

8. Bicycle Accessory Manufacturing

Black aluminum fastening components can be relevant to bicycle OEMs and accessory manufacturers seeking lightweight, visually coordinated hardware.

Potential non-safety-critical applications include:

• Bicycle computer mounts.

• Lighting brackets.

• Sensor accessories.

• Fender and mudguard brackets.

• Approved equipment holders.

• Bottle cage accessory mounts.

• Lightweight accessory covers.

Black anodized hardware may blend with black frames, brackets and machined accessory components.

Engineering Considerations

Bicycle engineers should evaluate vibration, impact, fatigue, corrosion, thread strength, installation torque and maintenance.

These aluminum lock nuts must not automatically replace specified fasteners in braking, steering, wheel retention or other safety-critical bicycle assemblies.

9. Mountain Bike Equipment Manufacturing

Mountain bike accessories are exposed to vibration, repeated impact, moisture, dirt and frequent maintenance.

Potential applications include approved non-critical accessory mounts, protective covers and instrument brackets.

Mountain Bike Design Checklist

• Impact and vibration loading.

• Thread stripping resistance.

• Aluminum material temper.

• Corrosion exposure.

• Anodizing damage.

• Nylon insert performance.

• Assembly and reuse requirements.

• Fatigue and joint preload.

Suspension pivots, brake assemblies and steering components require separately approved fastening systems.

10. Racing Bicycle and Performance Cycling Accessories

Lightweight black aluminum hardware may be evaluated for selected racing bicycle accessories.

Examples include approved electronics brackets, sensor mounts, non-critical instrument supports and accessory fastening systems.

For competition equipment, mechanical performance and fatigue validation must take priority over appearance or mass reduction.

11. Motorsport and Racing Equipment

Black anodized aluminum lock nuts may be relevant to selected non-structural racing equipment accessories.

Potential uses include:

• Data acquisition brackets.

• Instrument mounts.

• Camera accessories.

• Non-critical bodywork attachments.

• Equipment covers.

• Workshop fixtures.

Motorsport engineering requirements may include severe vibration, temperature variation and dynamic loading.

These lock nuts are not automatic replacements for approved fasteners in brakes, steering, suspension, wheels or restraint systems.

12. RC Racing and Model Engineering

Miniature aluminum lock nuts may be considered for:

• RC racing car accessories.

• Model vehicle equipment.

• Compact electronics mounts.

• Lightweight covers.

• Small mechanical assemblies.

M2–M4 sizes may be especially relevant to compact assemblies, subject to the approved product design.

The black finish can coordinate with dark-colored RC components.

13. Robotics and Industrial Automation

Robotics manufacturers may require lightweight fasteners for approved auxiliary equipment and compact assemblies.

Potential applications include:

• Sensor brackets.

• Instrument housings.

• Protective covers.

• Automation accessories.

• Small fixture components.

• Peripheral equipment mounts.

Production Requirements

• Accurate thread geometry.

• Consistent flange dimensions.

• Controlled installation torque.

• Repeatable insert retention.

• Assembly tool accessibility.

• Product identification.

• Inspection criteria.

JUXIN FASTENERS supports drawing-based custom fastener manufacturing for suitable robotics and automation projects.

14. Drone and UAV Equipment

Black aluminum lock nuts may be considered for approved non-flight-critical accessories, such as camera brackets, sensor accessories and equipment covers.

Flight-critical assemblies require separately qualified fastening components and engineering approval.

15. Automotive OEM and Tier-1 Applications

Automotive manufacturers may evaluate aluminum lock nuts for selected non-critical auxiliary components.

Potential applications include:

• Instrument accessories.

• Approved interior equipment brackets.

• Auxiliary sensor mounts.

• Non-critical covers.

• Lightweight equipment accessories.

Automotive engineering teams should evaluate vibration, temperature, corrosion, fatigue, thread strength and required traceability.

These lock nuts must not automatically replace high-strength steel nuts in structural automotive joints.

16. EV and Battery Pack Equipment

Potential applications include selected non-electrical accessory brackets, auxiliary sensor mounts and equipment covers.

EV engineering reviews should consider:

• Electrical isolation.

• Thermal exposure.

• Galvanic corrosion.

• Vibration and fatigue.

• Clamp load.

• Fire safety requirements.

• Battery system qualification.

Commercial nylon-insert aluminum lock nuts are not automatically suitable for high-voltage electrical terminals or safety-critical battery retention.

17. Rail Transit Equipment

Potential uses include approved non-critical interior accessories, instrument mounts and auxiliary enclosure components.

Rail equipment may require specific vibration, environmental, fire and smoke performance.

The nylon insert and complete fastening system must be qualified for the actual application.

18. Aerospace Ground Support Equipment

Potential applications include approved maintenance fixtures, ground support instrument brackets and workshop accessories.

Aircraft-installed fastening systems require appropriate aerospace standards, material traceability and engineering approval.

This product must not be described as aerospace-qualified without supporting evidence.

19. Electrical Cabinets and Power Equipment

Potential applications include:

• Control cabinet accessories.

• Instrument brackets.

• Lightweight enclosure components.

• Auxiliary equipment mounts.

• Non-critical power equipment covers.

Black anodizing can affect electrical contact characteristics.

Grounding, bonding and current-carrying requirements must be independently verified.

20. HVAC Equipment

Potential applications include suitable control accessories, instrumentation brackets and lightweight equipment covers.

Engineers should evaluate vibration, humidity, temperature and corrosion compatibility.

21. Medical and Laboratory Equipment

Potential applications include approved non-patient-contact laboratory equipment accessories, instrument brackets and enclosure components.

Medical equipment manufacturers must evaluate cleaning chemicals, contamination, material documentation and regulatory requirements.

These fasteners are not inherently medical-grade or suitable for implantable applications.

22. Construction and Industrial Machinery

Potential applications include auxiliary instrument mounts, equipment covers and non-structural brackets.

Heavy-duty and structural joints often require steel fasteners with specified mechanical properties.

6061 aluminum lock nuts should not replace such fasteners without engineering validation.

23. Sheet Metal Fabrication and Industrial Enclosures

The integrated flange can provide a wider bearing surface than a conventional hex nut.

Potential applications include suitable fabricated brackets, instrument housings and equipment enclosures.

Engineering requirements include:

• Sheet thickness.

• Hole diameter.

• Bearing stress.

• Flange seating.

• Joint preload.

• Thread engagement.

Where access is available from only one side, blind rivet nuts or self-clinching fasteners may be more appropriate.

24. Precision Machinery and Instrumentation

Potential applications include approved compact instruments, specialty machinery accessories and lightweight mechanical housings.

Important factors include thread tolerances, flange dimensions, tool access, insert retention and inspection consistency.

25. Industrial Fastener Manufacturing – Cold Heading, Cold Forming and CNC Machining

JUXIN FASTENERS is a manufacturer, not a trading company.

Our manufacturing capabilities combine cold heading, cold forming and CNC machining with product-specific secondary manufacturing operations.

This multi-process approach allows us to support different fastener geometries, dimensional requirements and industrial production needs.

Cold Heading and Cold Forming

These processes can be suitable for manufacturing selected fastener shapes in production volumes where forming is technically and commercially appropriate.

CNC Machining

CNC machining can support precision dimensions, specialized geometry and custom-engineered features.

Combined Manufacturing Processes

Cold heading or cold forming can be combined with CNC machining when the product design requires multiple manufacturing operations.

For example, a suitable component may be formed first and subsequently machined to achieve specific features.

However, the actual manufacturing route for a particular 6061 aluminum lock nut must be determined from its approved design and manufacturing plan.

We do not assume that every aluminum lock nut uses the same production process.

Our Broader Manufacturing and Product Capabilities

• Blind rivet nuts and blind rivet studs.

• Self-clinching nuts, studs and standoffs.

• Industrial nuts and lock nuts.

• Weld fasteners.

• Threaded inserts.

• Automotive fastening components.

• CNC precision components.

• Specialty and custom-engineered fasteners.

This broad manufacturing capability supports OEM customers requiring multiple fastening solutions for their equipment programs.

26. Custom Black Aluminum Lock Nut Manufacturing

JUXIN FASTENERS supports OEM/ODM manufacturing and made-to-drawing production for customer-specific aluminum locknut requirements.

Custom manufacturing projects may include:

• Special metric thread specifications.

• Custom UNC/UNF threads.

• Modified flange diameters.

• Customer-specific nut heights.

• Special wrenching dimensions.

• Approved 6061 material temper.

• Black anodizing requirements.

• Matte, satin or gloss appearance specifications.

• Custom nylon insert requirements.

• Prevailing-torque acceptance criteria.

• Customer-defined dimensional tolerances.

• Special inspection requirements.

• OEM packaging and labeling.

• Industrial batch production.

All custom requirements are subject to manufacturing feasibility, tooling and engineering review.

27. OEM Manufacturing Process and Project Coordination

Engineering Review

Customers submit 2D drawings, 3D CAD files, material requirements, thread specifications and production quantities.

Manufacturing Feasibility

The product design is reviewed for geometry, material, tolerances, manufacturing process and functional requirements.

Quotation and Production Planning

Commercial terms, tooling considerations and manufacturing schedules are evaluated according to the project.

Sample Evaluation

Where required, samples are evaluated against agreed engineering and appearance requirements.

Batch Manufacturing

Approved production specifications are used to establish the manufacturing and inspection requirements.

Quality Inspection

Product characteristics are inspected according to the approved acceptance criteria.

Packaging and Delivery

Packaging, identification and shipping requirements are coordinated according to the customer order.

28. Quality Control and Inspection Requirements

Depending on the approved product specification, relevant quality checks may include:

• 6061 aluminum material identification.

• Material temper verification.

• Thread inspection.

• Flange diameter measurement.

• Nut height measurement.

• Width-across-flats inspection.

• Nylon insert integrity.

• Insert retention.

• Prevailing-torque testing.

• Black anodizing appearance.

• Coating thickness verification.

• Color and gloss comparison.

• Packaging inspection.

• Lot identification and traceability.

The actual inspection plan must be agreed for the manufacturing project.

No specific testing performance, certification or inspection equipment is implied without supporting evidence.

29. Engineering Failure Prevention

30. International Standards and Technical References

The following standards are relevant to prevailing-torque locknut design but must not be treated as automatic compliance specifications for every aluminum product.

DIN 6926

A withdrawn German standard associated with prevailing-torque hex flange nuts with non-metallic inserts.

DIN EN 1663 and DIN EN 1666 are identified as replacement standards.

DIN 6926-style is used here as a configuration reference.

DIN EN 1663

Associated with metric coarse-thread prevailing-torque hex flange nuts with non-metallic inserts.

DIN EN 1666

Associated with metric fine-thread prevailing-torque hex flange nuts with non-metallic inserts.

ISO 7043:2012

Specifies characteristics of prevailing-torque hex flange nuts with non-metallic inserts, M5–M20, in steel property classes 8, 9 and 10.

These property classes do not automatically apply to 6061 aluminum.

ISO 12125:2012

Covers metric fine-pitch prevailing-torque hex flange nuts with non-metallic inserts, M8–M20.

It does not directly specify the complete M2–M8 coarse-thread aluminum product range.

ASME B18.16.6-2017 (R2022)

Covers specified inch-series prevailing-torque locknuts, including carbon steel nylon-insert hex flange configurations in nominal sizes 1/4 inch through 3/4 inch.

It does not automatically establish compliance for miniature 6061 aluminum hex flange lock nuts.

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

These French fastener standard references require verification of their exact editions and product applicability before any compliance claim.

Standards Compliance Clarification

The black anodized 6061 aluminum nylon-insert flange lock nut is described as a DIN 6926-style product.

Actual compliance, dimensions and mechanical performance must be established by the approved customer drawing and applicable specification.

31. Frequently Asked Questions

Are these lock nuts manufactured from 6061 aluminum?

Yes. The specified body alloy is 6061 aluminum. The exact temper must be confirmed.

What is the surface finish?

Black anodizing. Any additional PVD process requires separate verification.

What metric sizes are listed?

M2, M2.5, M3, M4, M5, M6 and M8.

Can JUXIN FASTENERS manufacture custom aluminum lock nuts?

Yes. We support drawing-based OEM/ODM custom manufacturing and industrial batch production, subject to feasibility review.

Does JUXIN combine cold heading and CNC machining?

Our broader manufacturing capabilities include cold heading, cold forming and CNC machining, which can be combined where appropriate. 

The actual process depends on the product design.

Can you produce custom UNC or UNF threads?

Customer-specific inch-series requirements can be reviewed. 

The reference thread sizes do not imply existing stock.

Are these lock nuts suitable for bicycles and mountain bikes?

They may be evaluated for approved non-safety-critical accessories. 

Critical bicycle systems require separately approved fasteners.

Can they be used in racing equipment?

Selected non-critical accessories may be suitable after engineering evaluation.

 Safety-critical motorsport joints require qualified fasteners.

Are they equivalent to steel DIN 6926 lock nuts?

No automatic equivalence should be assumed.

 Aluminum material properties and product-specific performance must be verified.

Does black anodizing improve locking torque?

The black color itself does not establish increased prevailing torque. 

Locking performance depends on the insert, thread geometry and manufacturing requirements.

What is the allowable operating temperature?

It depends on the nylon insert grade, mechanical loading and environment. 

A universal limit cannot be stated without verification.

Can they be reused?

Reuse depends on the approved specification and retained locking performance.

Can you manufacture custom black finishes?

Customer-defined black anodizing appearance requirements can be reviewed using approved samples and specifications.

What information is needed for a manufacturing quotation?

Engineering drawings, material requirements, threads, dimensions, tolerances, finish, inspection criteria and production quantities.

32. Request a Quote – Black Aluminum Flange Lock Nut Manufacturing

JUXIN FASTENERS provides industrial fastener manufacturing and OEM/ODM custom production solutions for global equipment manufacturers.

Our manufacturing capabilities combine cold heading, cold forming and CNC machining to support standard and custom-engineered fastening components.

For black anodized 6061 aluminum nylon-insert hex flange lock nuts, we support technical review of custom dimensions, 

thread configurations, material specifications, surface finishing and industrial batch production.

We welcome RFQs from:

• Bicycle and mountain bike accessory OEMs.

• Racing and motorsport equipment manufacturers.

• Robotics and automation manufacturers.

• Automotive and EV component suppliers.

• Industrial machinery manufacturers.

• Electrical cabinet and HVAC equipment manufacturers.

• Precision equipment manufacturers.

• OEM and Tier-1/Tier-2 procurement teams.

• Supplier development and supply chain managers.

Please Include in Your RFQ

1. Metric or UNC/UNF thread specification.

2. 6061 aluminum alloy and required temper.

3. Nut height and flange dimensions.

4. Customer 2D drawing or 3D CAD file.

5. Black anodizing requirements.

6. Nylon insert and prevailing-torque specifications.

7. Operating conditions and joint requirements.

8. Dimensional and quality acceptance criteria.

9. Required quantity and annual forecast.

10. Packaging, labeling and delivery requirements.

Our team can review your engineering specifications and provide manufacturing quotation support for suitable OEM projects.

Email: info@juxinfasteners.com

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

JUXIN FASTENERS – Industrial Fastener Manufacturer | Cold Heading & CNC Machining | Custom OEM/ODM Fastener Manufacturing | Made-to-Drawing Production

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.