Color Anodized Aluminum Nylon-Insert Hex Flange Lock Nuts – M2–M8

Color Anodized Aluminum Nylon-Insert Hex Flange Lock Nuts – M2–M8

JUXIN FASTENERS supplies color anodized aluminum nylon-insert hex flange lock nuts for OEM manufacturers and industrial equipment builders requiring lightweight fastening components, 

prevailing-torque locking performance and decorative or functional anodized finishes.

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

The aluminum body reduces component weight, the nylon insert creates resistance to rotational loosening, 

and the flange provides a wider bearing surface than a conventional hex nut without a washer.

Available in metric sizes M2, M2.5, M3, M4, M5, M6 and M8, these colorful aluminum locknuts are suitable for engineering evaluation in bicycles, 

mountain bikes, racing equipment, drones, RC vehicles, robotics, lightweight machinery and selected industrial assemblies.

Common North American and European product names include anodized aluminum nylon-insert flange lock nuts, aluminum nyloc flange nuts,

 colored aluminum locknuts, lightweight prevailing-torque nuts, aluminum hex flange locknuts and self-locking aluminum flange nuts.

Product Specifications

Engineering Note

These aluminum locknuts are not automatically equivalent to steel DIN 6926 or ISO 7043 fasteners.

ISO 7043:2012 covers specified steel prevailing-torque hex flange nuts from M5 through M20 in property classes 8, 9 and 10.

The aluminum versions described here include smaller sizes M2, M2.5, M3 and M4, which fall outside that standard's size range.

Even for M5, M6 and M8, material properties, proof-load requirements and prevailing-torque performance must be established separately for the aluminum configuration.

Lightweight Aluminum Alloy Construction

Aluminum alloy has a density of approximately 2.7 g/cm³, compared with approximately 7.85 g/cm³ for carbon steel.

For comparable solid metal volumes, aluminum is therefore approximately 65% lighter than steel.

The actual weight reduction of a finished lock nut depends on its geometry, alloy and nylon insert.

Engineering Benefits of Aluminum Construction

• Lower component mass than comparable steel designs.

• Suitable for weight-sensitive mechanical assemblies.

• Non-ferromagnetic aluminum body.

• Good atmospheric corrosion resistance in appropriate environments.

• Compatibility with decorative and protective anodized finishes.

• Potential suitability for precision-machined custom geometries.

• Reduced rotating or moving assembly mass where the design permits.

Aluminum alloy lock nuts should not be selected solely for minimum weight.

Their mechanical strength, thread stripping resistance, fatigue performance and joint preload capability must be verified against the application requirements.

11 Available Anodized Colors

JUXIN FASTENERS offers the following color options:

1. Green

2. Titanium Grey

3. Silver

4. Gold

5. Fuchsia

6. Sky Blue

7. Royal Blue

8. Orange

9. Black

10. Purple

11. Wine Red

Color anodizing creates an aluminum oxide surface layer that can improve surface protection and provide decorative color options.

Anodized colors are particularly useful in bicycle accessories, racing equipment, custom machinery, robotics and products where appearance or component identification is important.

Color Selection for OEM Manufacturing

Customers may specify anodized colors for product differentiation, brand coordination or assembly identification.

For production orders, color consistency should be evaluated using approved physical samples and agreed inspection conditions.

Color appearance may vary depending on alloy composition, surface preparation, anodizing process, dye chemistry and batch conditions.

Titanium Grey is a color designation and does not indicate that the nut is manufactured from titanium.

Anodizing and Corrosion Resistance

Aluminum naturally forms a protective oxide film when exposed to air.

Anodizing increases the thickness of the oxide layer and can improve surface durability when properly specified.

However, anodized aluminum is not universally corrosion-proof.

Service life depends on the alloy, anodizing thickness, sealing quality, chemical exposure, moisture and contact with dissimilar metals.

For outdoor bicycle, motorsport or industrial applications, engineers should evaluate:

• Anodizing type and thickness.

• Surface sealing requirements.

• Color stability under UV exposure.

• Salt and moisture exposure.

• Galvanic compatibility.

• Contact with cleaning chemicals.

• Thread friction and installation conditions.

Metric Thread Sizes M2–M8

The following table provides standard metric coarse-thread pitch references.

These values identify standard metric coarse threads.

Final nut height, flange diameter, width across flats, nylon insert dimensions and manufacturing tolerances must follow the approved product drawing.

M2 and M2.5 Miniature Aluminum Locknuts

M2 and M2.5 versions may be considered for miniature equipment, electronic assemblies, RC models, drones, precision instruments and compact mechanical components.

The small thread dimensions require careful control of assembly torque and thread engagement.

M3 and M4 Aluminum Locknuts

M3 and M4 versions are relevant to robotics, automation equipment, lightweight brackets, RC vehicles, drone accessories and compact mechanical assemblies.

Engineers should evaluate joint loading, mating bolt material and required prevailing torque.

M5, M6 and M8 Aluminum Locknuts

M5, M6 and M8 versions may be considered for bicycle accessories, motorsport equipment, machinery guards, mounting brackets and other suitably engineered assemblies.

Larger thread size does not automatically make an aluminum locknut appropriate for structural or safety-critical joints.

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

For North American OEM customers, Unified National Coarse (UNC) and Unified National Fine (UNF) threads may be requested for custom aluminum locknuts.

The following table provides common inch-series engineering reference sizes.

These inch-series sizes are engineering references for customer inquiries and do not represent confirmed standard production availability.

Custom UNC/UNF aluminum flange lock nuts require evaluation of material, dimensions, tooling, thread tolerances and nylon insert performance.

Metric and UNC/UNF threads are not interchangeable.

A metric M5 or M6 nut must not be substituted for a similar-diameter inch-series nut without verified thread compatibility.

How Nylon-Insert Aluminum Flange Lock Nuts Resist Loosening

The nylon insert is retained near the upper section of the nut.

When the mating bolt enters the nylon insert, the insert deforms around the external thread.

This creates prevailing torque that resists relative rotation between the nut and bolt.

The locking action can help reduce rotational loosening under vibration and repeated movement.

The integrated flange distributes bearing loads over a larger contact area than a conventional hex nut without a washer.

Key Functional Advantages

• Prevailing-torque resistance to rotational loosening.

• Lightweight aluminum alloy construction.

• Integrated flange for increased bearing area.

• Multiple anodized color options.

• Compact fastening arrangement.

• Potential reduction in separate washer handling.

• Suitable for selected manually assembled and automated production systems.

• Customizable geometry for OEM applications.

Prevailing torque is not the same as clamp force.

A nylon-insert locknut cannot compensate for insufficient joint preload, inadequate thread engagement or an unsuitable mechanical design.

Industrial Applications & Engineering Solutions

1. Bicycle and Road Cycling Components

Color anodized aluminum nylon-insert flange lock nuts are particularly relevant to lightweight bicycle accessories and selected non-safety-critical mounting assemblies.

Potential applications include:

• Bicycle accessory brackets.

• Fender and mudguard mounting accessories.

• Bottle cage accessory hardware.

• Non-critical equipment mounts.

• Bicycle lighting brackets.

• Computer and sensor mounts.

• Decorative or color-matched mechanical accessories.

The lightweight construction can reduce component mass, while anodized colors allow manufacturers to coordinate fastener appearance with bicycle frames and accessories.

The nylon insert may provide additional resistance to rotational loosening in suitable vibration-exposed assemblies.

Bicycle Engineering Considerations

Bicycle engineers must verify:

• Required clamp load.

• Bolt and nut material compatibility.

• Installation torque.

• Corrosion exposure.

• Thread engagement.

• Fatigue loading.

• Maintenance and replacement intervals.

Aluminum nylon-insert flange lock nuts should not automatically replace approved steel or titanium fasteners in bicycle braking, steering, suspension pivots, wheel retention or other safety-critical joints.

2. Mountain Bikes and Off-Road Cycling

Mountain bikes and off-road bicycles experience vibration, mud, water, repeated impacts and cyclic loading.

Potential applications include approved accessory mounts, protective guards, equipment brackets and non-critical lightweight assemblies.

The nylon insert can help resist rotational loosening, while anodizing provides decorative surface protection.

For mountain bike applications, engineers should consider:

• Repeated vibration and impact loading.

• Mud and water exposure.

• Cleaning chemicals.

• Dissimilar metal contact.

• Thread damage during maintenance.

• Required prevailing-torque performance.

Suspension, braking, steering and structural fastening systems require approved fastener specifications and independent engineering validation.

3. Racing Bicycles and Performance Cycling Equipment

Weight-sensitive racing bicycle accessories may benefit from lightweight aluminum fastening components.

Potential applications include selected accessory brackets, equipment holders, non-critical aerodynamic accessories and instrument mounts.

Color anodizing can also support product branding and visual identification.

However, racing use does not automatically establish suitability for high-load joints.

Mechanical performance and fatigue resistance must be verified before using aluminum lock nuts in competition equipment.

4. Motorsport and Racing Cars

Motorsport equipment frequently emphasizes weight reduction, serviceability and component identification.

Color anodized aluminum lock nuts may be considered for non-structural racing accessories, instrument mounts, lightweight covers, equipment brackets and approved auxiliary assemblies.

Potential applications include:

• Dashboard accessory mounts.

• Data acquisition equipment brackets.

• Non-critical bodywork accessories.

• Instrument mounting hardware.

• Lightweight protective covers.

• Selected pit equipment and workshop fixtures.

The anodized finish can help distinguish component groups or support color-coded assembly procedures.

Motorsport Safety Considerations

Standard aluminum nylon-insert flange lock nuts must not be substituted for approved fasteners in braking, steering, suspension,

 wheel retention, restraint systems or other safety-critical motorsport assemblies.

Engineers should verify fatigue performance, vibration resistance, operating temperature and maintenance requirements.

5. Racing Motorcycles and Powersports Equipment

Potential applications include selected motorcycle accessories, lightweight brackets, instrument mounts, non-critical body panels and equipment covers.

Color anodized aluminum components may complement the appearance of racing motorcycles and custom powersports equipment.

The nylon insert can help resist rotational loosening in suitable mechanical joints.

Fasteners used in motorcycle braking, steering, suspension, wheels and critical structural connections require separately approved specifications.

6. RC Cars and Radio-Controlled Racing Vehicles

RC cars, radio-controlled racing vehicles and model engineering equipment are relevant markets for small aluminum lock nuts.

Potential applications include approved miniature mechanical assemblies, equipment brackets, protective covers and selected accessory mounts.

M2, M2.5, M3 and M4 sizes are particularly relevant to compact assemblies.

The lightweight construction and multiple colors can support product differentiation.

Engineers should consider vibration, repeated assembly, small thread dimensions and damage from excessive tightening.

7. Drones, UAVs and Multirotor Equipment

Potential applications include drone accessories, camera mounting brackets, sensor supports, non-critical equipment frames and approved lightweight mechanical assemblies.

Small metric sizes can support compact equipment designs where component weight is important.

The nylon insert provides rotational resistance in suitable assemblies.

For drones and UAVs, engineers should evaluate vibration, fatigue, environmental exposure and the consequences of fastener failure.

Flight-critical fastening systems require application-specific engineering validation and approved components.

8. Automotive and Electric Vehicle Accessories

Color anodized aluminum lock nuts may be considered for selected automotive accessories, lightweight brackets, instrument mounts and non-critical mechanical assemblies.

Potential EV applications include auxiliary equipment supports, instrumentation brackets and approved non-electrical mounting accessories.

The aluminum body can reduce component weight in suitable applications.

Engineers must consider galvanic corrosion, thermal exposure, vibration and the strength of the mating components.

These lock nuts should not automatically be used for high-voltage electrical terminals, critical battery retention or safety-related vehicle joints.

9. EV Battery Pack and Thermal Management Equipment

Potential applications include approved auxiliary brackets, sensor mounts, non-critical enclosure accessories and selected equipment supports.

The lightweight aluminum body may be relevant to systems already using aluminum structural components.

However, aluminum-to-aluminum contact does not eliminate the need to evaluate galvanic corrosion, surface damage or joint preload.

For battery pack applications, engineers should assess:

• Electrical isolation.

• Operating temperature.

• Corrosion compatibility.

• Vibration and fatigue.

• Fire and safety requirements.

• Maintenance accessibility.

The nylon insert is not automatically suitable for high-temperature battery environments or critical electrical connections.

10. Rail Transit and Lightweight Railway Equipment

Potential applications include selected interior equipment, instrument brackets, non-critical enclosure accessories and lightweight auxiliary assemblies.

Rail transit environments may involve vibration, thermal cycling, corrosion and fire-performance requirements.

The nylon insert may require evaluation against applicable railway fire and smoke specifications.

Standard colored aluminum lock nuts are not automatically approved for safety-critical railway assemblies.

11. Aerospace Ground Support and Aviation Equipment

Lightweight aluminum lock nuts may be considered for non-flight-critical ground support equipment, workshop fixtures, maintenance accessories and approved industrial applications.

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

A commercial color anodized aluminum lock nut must not be represented as an aerospace-certified fastener.

12. Robotics and Industrial Automation

Potential applications include robotic accessories, sensor brackets, protective covers, automation frames, compact equipment mounts and non-critical tooling structures.

Small sizes such as M2, M3 and M4 may be useful in precision automation equipment.

The lightweight aluminum body can reduce component mass in suitable moving assemblies.

Production engineers should evaluate:

• Thread quality.

• Assembly torque repeatability.

• Prevailing-torque performance.

• Dimensional consistency.

• Anodizing quality.

• Tool access and serviceability.

13. Electrical Cabinets and Electronic Equipment

Potential applications include electronic equipment enclosures, lightweight mounting brackets, control panel accessories, instrument housings and selected cabinet hardware.

Anodized aluminum can provide a decorative and protective finish.

However, anodized surfaces may affect electrical contact resistance.

Electrical bonding, grounding continuity and current-carrying requirements must be evaluated independently.

The nylon insert does not automatically provide electrical isolation of the complete fastener.

14. HVAC and Ventilation Equipment

Potential applications include lightweight ventilation accessories, instrument brackets, control equipment mounts and non-critical enclosure components.

The aluminum body offers low weight and good atmospheric corrosion resistance in suitable environments.

Engineers should evaluate moisture exposure, service temperature, vibration and compatibility with adjacent materials.

15. Medical Equipment and Laboratory Machinery

Potential applications include approved non-patient-contact equipment accessories, instrument brackets, laboratory machinery enclosures and lightweight auxiliary assemblies.

Color coding may help distinguish equipment configurations or service components.

However, suitability depends on cleaning chemicals, contamination requirements, anodizing quality and applicable regulatory specifications.

Commercial anodized aluminum lock nuts are not inherently medical-grade, sterile or suitable for implantable applications.

16. Construction Equipment and Industrial Machinery

Potential applications include non-structural equipment covers, lightweight guards, instrumentation mounts and auxiliary mechanical brackets.

The integrated flange can simplify suitable fastening arrangements.

Heavy construction machinery often requires high mechanical strength and resistance to severe vibration.

Aluminum nylon-insert flange lock nuts should not replace specified high-strength steel fasteners in load-bearing or safety-critical joints without engineering approval.

17. Sheet Metal Fabrication and Lightweight Enclosures

Integrated flange lock nuts may provide a broader bearing surface for suitable aluminum sheet-metal brackets, equipment enclosures and fabricated components.

Engineers should verify sheet thickness, hole diameter, edge distance, flange seating and local deformation.

For blind-side installation, alternative fasteners such as blind rivet nuts or self-clinching fasteners may be more appropriate.

18. Consumer Electronics and Precision Instruments

Small anodized aluminum lock nuts may be considered for compact instrument housings, camera accessories, precision equipment mounts and non-critical mechanical assemblies.

The available colors may support product identification or industrial design requirements.

Engineers should consider small thread tolerances, torque limitations and repeated assembly.

Installation and Assembly Engineering Guidelines

Thread Compatibility

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

Metric and UNC/UNF thread systems must not be mixed.

Tightening Torque

Aluminum alloy threads may have lower stripping resistance than comparable high-strength steel threads.

Excessive tightening can damage the nut or mating threads.

The assembly torque must be established according to the actual alloy, thread size, coating, bolt material and joint requirements.

Prevailing Torque and Clamp Load

The nylon insert creates resistance during installation.

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

Prevailing torque does not guarantee adequate preload.

Nylon Insert Engagement

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

Thread engagement and bolt protrusion must follow the approved assembly requirements.

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 and mechanical loading.

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

Reusability

Nylon-insert lock nuts may be reused when permitted by the approved specification and when locking performance remains acceptable.

Repeated installation can reduce prevailing torque.

Nuts with damaged nylon inserts, distorted aluminum threads or insufficient locking resistance should be replaced.

Galvanic Corrosion

Aluminum may experience galvanic corrosion when coupled with dissimilar metals in the presence of moisture or conductive electrolytes.

Particular attention should be given to mating steel, stainless steel, titanium or copper-alloy components.

Anodizing may provide a protective barrier, but damage to the coating or exposed threads can affect corrosion behavior.

Flange Bearing Surface

The integrated flange increases the contact area against the mating component.

However, it does not automatically prevent damage to softer materials or eliminate the need for a washer in every joint design.

Verify local bearing stress, flange geometry and surface condition.

OEM Quality Control and Inspection Requirements

For repeatable industrial production, quality planning may include:

• Aluminum alloy identification and material verification.

• Mechanical property testing where specified.

• Thread gauge inspection.

• Width-across-flats inspection.

• Overall height and flange diameter verification.

• Nylon insert integrity and retention inspection.

• Prevailing-torque testing against approved criteria.

• Anodizing thickness inspection.

• Color consistency evaluation.

• Surface appearance inspection.

• Corrosion testing where specified.

• Dimensional and cosmetic defect inspection.

• Lot identification and traceability.

• Packaging and shipment inspection.

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

DIN 6926, ISO 7043 and Related Standards

DIN 6926

A widely recognized designation for metric 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 and a size range of M5–M20.

ISO 12125

A standard covering specified metric fine-thread prevailing-torque hex flange nuts with non-metallic inserts.

DIN EN 1666

A European standard associated with metric fine-thread nylon-insert hex flange nuts.

ASME B18.16.6

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

Its applicability to a particular aluminum 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 fastener standard references that may appear in industrial specifications.

Their exact scope, edition and applicability must be verified before claiming compliance or equivalence.

Important Standards Note

These standards are not universally interchangeable.

A color anodized aluminum nylon-insert flange lock nut should be specified using an approved combination of dimensional requirements, 

aluminum alloy properties, thread tolerances, anodizing specifications and prevailing-torque performance criteria.

Custom OEM Color Anodized Aluminum Lock Nut Solutions

JUXIN FASTENERS supports technical review of standard and drawing-based aluminum fastening requirements.

Potential customization areas include:

• Metric M2–M8 thread configurations.

• UNC and UNF inch-series inquiries.

• Customer-specified aluminum alloy grades.

• Custom flange diameters.

• Special nut heights and wrenching dimensions.

• Color anodizing requirements.

• Customer-defined color samples.

• Application-specific nylon insert requirements.

• Prevailing-torque performance requirements.

• Custom inspection and documentation.

• Industrial bulk packaging.

• Drawing-based OEM production programs.

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

Frequently Asked Questions

What is a color anodized aluminum nylon-insert flange lock nut?

It is an aluminum alloy hex flange nut with a non-metallic nylon locking insert and a color anodized surface finish. 

The insert provides prevailing-torque resistance, while the flange distributes bearing loads.

Are aluminum nylon-insert flange lock nuts suitable for bicycles?

They may be suitable for selected bicycle accessories and non-safety-critical assemblies. 

Braking, steering, suspension and other critical joints require separately approved fasteners.

Can these lock nuts be used on mountain bikes?

They may be considered for approved accessories and lightweight mounting applications. 

Engineers must verify vibration, impact, corrosion and fatigue requirements.

Are they suitable for racing cars and motorcycles?

They may be suitable for selected non-critical motorsport accessories and equipment mounts. 

They must not replace approved safety-critical fasteners without engineering validation.

Are these nuts fully compliant with DIN 6926 or ISO 7043?

Not automatically. These standards primarily address steel configurations, and ISO 7043 covers M5–M20. 

The aluminum M2–M8 versions require separately defined material and performance specifications.

What aluminum alloy is used?

The exact aluminum alloy must be confirmed from the approved material specification. 

A specific grade such as 6061-T6 or 7075-T6 should not be assumed without supporting documentation.

Are the anodized colors permanent?

Anodizing provides a durable surface finish when properly specified, but color stability depends on the alloy, dye, sealing process, UV exposure and service environment.

Can these lock nuts be used outdoors?

Suitability depends on the alloy, anodizing specification, environmental exposure and galvanic compatibility. 

Outdoor use should be evaluated against the actual operating conditions.

Can metric aluminum lock nuts replace UNC or UNF nuts?

No. Metric and Unified thread systems are not interchangeable.

Can nylon-insert aluminum lock nuts be reused?

Reuse may be permitted when the applicable specification allows it and the nylon insert and aluminum threads continue to meet the required performance criteria.

Are these lock nuts suitable for high temperatures?

The nylon insert limits operating temperature. The actual service rating must be verified for the selected insert material and fastening system.

Can custom colors and dimensions be manufactured?

Custom anodizing colors, dimensions and thread specifications may be reviewed against customer drawings, approved samples and production requirements.

What information is required for an OEM quotation?

Customers should provide the thread designation, alloy requirements, dimensions, anodizing color, prevailing-torque requirements, estimated quantity and engineering drawings where available.

Request a Quote – Color Anodized Aluminum Nylon-Insert Hex Flange Lock Nuts

JUXIN FASTENERS supplies industrial fastening components for OEM manufacturers, bicycle component manufacturers, 

motorsport equipment producers, drone and robotics manufacturers, Tier-1 and Tier-2 suppliers, 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. Aluminum alloy grade or material requirements.

3. Flange dimensions, nut height and thread tolerances.

4. Required anodizing color and surface specification.

5. Approved color sample or color reference, if applicable.

6. Nylon insert and prevailing-torque requirements.

7. Operating temperature and environmental conditions.

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

9. Estimated annual consumption and order quantity.

10. Inspection, packaging and delivery requirements.

Our team can review standard and customized lightweight fastening requirements and provide technical quotation support for suitable OEM production programs.

Email: info@juxinfasteners.com

Website: www.juxinfasteners.com

JUXIN FASTENERS – Lightweight Aluminum 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.