Black Anodized 6061 Aluminum Nylon-Insert Hex Lock Nuts

Black Anodized 6061 Aluminum Nylon-Insert Hex Lock Nuts

Custom Lightweight Prevailing-Torque Fasteners for Equipment Enclosures, Robotics, Industrial Cabinets and OEM Manufacturing

JUXIN FASTENERS manufactures standard and custom industrial fasteners for OEM, Tier-1 and Tier-2 manufacturers, mechanical engineers, production managers, 

supplier development teams and international procurement organizations.

Our black anodized 6061 aluminum nylon-insert hex lock nuts combine a lightweight aluminum alloy body with a retained non-metallic locking insert and a black anodized surface finish.

These fasteners may be considered for suitable mechanical assemblies where component weight, controlled dimensions, locking performance and coordinated black equipment appearance are important.

Unlike brightly colored decorative aluminum locknuts, this black version is particularly relevant to industrial equipment housings, black metal enclosures, 

instrumentation brackets, robotics accessories and precision mechanical assemblies.

In the North American market, relevant product names include black aluminum nylon-insert lock nuts, black anodized aluminum hex locknuts, 

aluminum Nyloc-type nuts and aluminum prevailing-torque lock nuts.

JUXIN supports OEM/ODM manufacturing, CNC machining, custom dimensions, customer-approved anodized finishes and industrial batch production.

Product Specifications

The final dimensions, material condition, surface finish and locking performance must be confirmed for each production order.

Black Anodized Aluminum vs. Black Zinc-Plated Steel

A black-colored fastener is not necessarily made from the same material or treated by the same process.

These products differ in material properties, coating systems, dimensional considerations and application suitability.

They must not be substituted solely because they share a black appearance.

Why Black Anodized Aluminum Locknuts Are Relevant to Industrial OEMs

Many industrial products use black or dark-colored equipment housings.

Examples include:

• Robotics sensor enclosures.

• Industrial automation accessories.

• Electronic equipment housings.

• Telecommunications cabinets.

• Instrumentation brackets.

• AI data center cabinet accessories.

• Motorcycle instrumentation components.

• Bicycle electronics accessories.

A black anodized aluminum locknut may help coordinate visible fastening hardware with the surrounding equipment.

However, the engineering decision must also account for loadability, mating materials, locking performance and environmental exposure.

Black Finish Appearance: Matte, Satin or Gloss?

Black anodizing can produce different visual appearances depending on the material and finishing process.

Common commercial descriptions include:

• Matte Black.

• Satin Black.

• Semi-Gloss Black.

• Gloss Black.

• Deep Black.

These terms are not universally interchangeable technical specifications.

The featured product is described as black anodized.

The required gloss level and surface texture should be established using an approved physical master sample.

OEM Black Finish Consistency

Black anodized hardware may be installed next to:

• Black-painted sheet metal.

• Powder-coated enclosures.

• Black-anodized brackets.

• Polymer housings.

• Black-coated structural components.

These different materials and finishes may not produce identical black appearance.

A manufacturer should therefore distinguish between color matching within the same anodizing process and appearance coordination across different coating systems.

Recommended OEM Finish Approval Process

Where appearance is critical, lighting, viewing conditions and acceptable variation should be agreed before production.

Black Anodizing and Surface Engineering

Anodizing is an electrochemical process that forms an oxide layer on aluminum.

Black coloration may be achieved using a suitable coloring process.

The final appearance depends on:

• Aluminum alloy.

• Material temper.

• Surface preparation.

• Surface texture.

• Anodizing conditions.

• Coloring process.

• Sealing conditions.

Black anodizing does not automatically establish a particular coating thickness, hardness, corrosion resistance or electrical insulation performance.

These requirements must be specified and verified separately.

Anodizing, Polishing and PVD Are Different Processes

Polishing modifies surface texture and reflectivity.

Anodizing creates an oxide layer on aluminum.

PVD is a separate deposition coating process.

The featured product uses a black anodized aluminum finish.

Alternative processes should only be specified when required by the approved drawing.

6061 Aluminum Alloy for Lightweight Mechanical Components

6061 is an aluminum-magnesium-silicon alloy used in machined industrial components.

Its approximate density is 2.70 g/cm³.

For comparison:

For equal solid metal volume, 6061 aluminum is approximately 66% lighter than carbon steel.

Actual nut weight depends on geometry.

Lower density does not establish equivalent mechanical strength.

Why Aluminum Temper Matters

6061 mechanical properties depend on temper and processing condition.

For example, 6061-T6 and annealed 6061 do not have equivalent mechanical properties.

The approved drawing should specify the required temper.

Aluminum internal thread strength must also be evaluated against the mating bolt and required joint preload.

How Nylon-Insert Prevailing-Torque Locknuts Work

A nylon-insert locknut contains a retained polymer locking ring.

When the mating bolt engages the insert, the polymer deforms locally and creates resistance to rotation.

This resistance is called prevailing torque.

Prevailing torque can help resist unintended nut rotation in a properly engineered fastening joint.

It does not replace correct joint preload or sufficient thread engagement.

Factors Affecting Prevailing-Torque Performance

Relevant variables include:

• Nylon formulation.

• Insert geometry.

• Insert retention.

• Mating bolt thread dimensions.

• Thread surface condition.

• Lubrication.

• Installation speed.

• Temperature.

• Reuse history.

The finished product must meet the agreed functional acceptance requirements.

Metric Thread Sizes and Inch Diameter References

The listed metric product family includes M3, M4, M5, M6, M8, M10 and M12.

These are standard metric coarse-thread references.

The actual thread designation and tolerance must be confirmed against the approved drawing.

The inch values are nominal diameter conversions only.

They do not represent interchangeable inch-series threads.

Metric Fine-Thread Customization

Customer-specific metric fine-thread designs may be evaluated.

Examples include:

• M6 × 0.75.

• M8 × 1.0.

• M10 × 1.25.

• M12 × 1.25.

These are engineering references, not confirmed stock items.

American UNC and UNF Thread References

JUXIN FASTENERS can review custom Unified inch-series aluminum locknut designs according to customer drawings.

These are recognized thread designations supplied for engineering reference.

They do not establish stock availability or manufacturing feasibility for every size.

Metric and Inch Thread Compatibility

Metric, UNC, UNF, BSW and BSF are separate thread systems.

They are not directly interchangeable.

Examples:

• M6 × 1.0 is not interchangeable with 1/4-20 UNC.

• M8 × 1.25 is not interchangeable with 5/16-18 UNC.

• M10 × 1.5 is not interchangeable with 3/8-16 UNC.

The mating thread designation, pitch and tolerance must be verified.

Application: Industrial Equipment Enclosures

Industrial equipment manufacturers may evaluate black aluminum nylon-insert locknuts for suitable auxiliary mounting applications.

Potential uses include:

• Instrumentation brackets.

• Equipment covers.

• Sensor fixtures.

• Lightweight accessory mounts.

• Non-critical enclosure hardware.

The black finish may coordinate with surrounding equipment housings.

Mechanical load and locking requirements must be verified.

Application: Robotics and Industrial Automation

Potential applications include:

• Robot sensor brackets.

• Vision-system accessory mounts.

• Industrial automation fixtures.

• Lightweight instrumentation supports.

• Non-critical equipment covers.

Dynamic loading, vibration, fatigue and prevailing-torque performance must be evaluated.

Application: AI Data Center Metal Cabinet Manufacturing

AI data center infrastructure includes server cabinets, power distribution enclosures, cooling equipment and auxiliary instrumentation.

Potential applications include:

• Cabinet accessory brackets.

• Auxiliary sensor mounts.

• Cable-management fixtures.

• Non-critical equipment covers.

• Lightweight instrumentation supports.

Engineers should evaluate sheet metal thickness, installation access, joint preload and grounding requirements.

For one-sided sheet metal installation, rivet nuts or self-clinching fasteners may be more suitable.

Application: Telecommunications Equipment Manufacturing

Potential applications include:

• Telecom cabinet accessories.

• Instrumentation brackets.

• Cable-management fixtures.

• Auxiliary equipment covers.

Outdoor installations require evaluation of moisture, corrosion and temperature cycling.

Application: Semiconductor Equipment Manufacturing

Potential applications include suitable external instrumentation brackets and non-process auxiliary fixtures.

Nylon inserts may be inappropriate for vacuum, high-temperature or contamination-sensitive environments.

Application: Electronics and Electrical Appliance Manufacturing

Potential applications include:

• Electronics equipment housings.

• Instrumentation brackets.

• Lightweight mechanical supports.

• Non-critical enclosure hardware.

Electrical safety, operating temperature and assembly load requirements must be reviewed.

Application: Mountain Bike and MTB Accessories

Mountain bike accessory manufacturers may evaluate black aluminum locknuts for suitable lightweight mounting applications.

Potential uses include:

• Bicycle computer brackets.

• Auxiliary lighting mounts.

• Sensor fixtures.

• Approved accessory holders.

• Non-critical equipment mounts.

Mountain bike equipment may experience vibration, impact, moisture and repeated servicing.

These nuts must not automatically replace specified hardware in brakes, steering, suspension or wheel-retention systems.

Application: Performance Bicycle Manufacturing

Potential applications include cycling electronics holders, lightweight instrumentation brackets and suitable non-critical accessory fixtures.

The design decision should be based on verified mechanical requirements.

Application: Motorcycle Accessory Manufacturing

Motorcycle equipment manufacturers may consider black aluminum locknuts for selected auxiliary assemblies.

Potential applications include:

• Instrumentation brackets.

• Sensor mounts.

• Camera accessories.

• Approved fairing accessories.

• Non-critical equipment covers.

Vibration, temperature variation and maintenance requirements must be reviewed.

Safety-critical motorcycle joints require separately qualified fasteners.

Application: Motorsport and Racing Equipment

Motorsport manufacturers may evaluate lightweight black aluminum locknuts for suitable auxiliary equipment.

Potential applications include:

• Racing data acquisition brackets.

• Electronics mounting fixtures.

• Instrumentation supports.

• Non-critical equipment covers.

• Workshop test fixtures.

The product must not automatically replace specified high-strength fasteners in braking, steering, suspension or drivetrain systems.

Application: Automotive OEM Manufacturing

Potential applications include approved non-critical sensor brackets, instrumentation fixtures and lightweight accessory hardware.

Automotive engineering teams must evaluate mechanical loading, fatigue, vibration, temperature and mating materials.

Application: Medical Equipment Manufacturing

Potential applications include suitable laboratory equipment brackets, non-patient-contact instrument fixtures and external accessories.

Cleaning compatibility, material traceability and applicable regulatory requirements must be assessed.

No medical-device certification is claimed.

Application: Food Machinery Manufacturing

Potential applications include suitable external machinery accessories and non-food-contact fixtures.

Washdown chemicals, temperature and contamination risks must be considered.

No food-contact certification is claimed.

Application: Electrical Power Equipment Manufacturing

Potential applications include control cabinet accessories and instrumentation fixtures.

Electrical grounding, conductivity, insulation and thermal requirements must be evaluated independently.

A nylon insert does not automatically provide electrical insulation.

Application: Energy Equipment Manufacturing

Potential applications include monitoring brackets, energy storage enclosure accessories and auxiliary equipment covers.

Thermal cycling, corrosion and electrical safety requirements must be evaluated.

Application: Rail Transit Equipment Manufacturing

Potential applications include approved non-critical instrumentation brackets and auxiliary equipment fixtures.

Rail applications may require vibration, fatigue, fire, smoke and environmental qualification.

Application: Marine Equipment Manufacturing

Potential applications include selected non-critical instrumentation mounts and equipment accessories.

Galvanic corrosion must be evaluated where aluminum contacts dissimilar metals in conductive environments.

Application: HVAC Equipment Manufacturing

Potential applications include control cabinet accessories, instrumentation brackets and non-critical equipment fixtures.

Vibration, humidity and thermal cycling should be considered.

Engineering Risk: Aluminum Thread Stripping

The internal thread loadability of an aluminum nut depends on:

• Material temper.

• Nut height.

• Thread engagement.

• Mating bolt strength.

• Thread tolerance.

• Installation torque.

• Required joint preload.

A 6061 aluminum locknut must not automatically replace a steel Class 8 or Class 10 nut.

Steel locknut tightening values should not automatically be applied to aluminum locknuts.

Engineering Risk: Nylon Insert Temperature and Reuse

The operating temperature capability depends on the actual nylon formulation and finished product design.

A universal temperature range must not be assumed.

Repeated installation and removal may reduce prevailing-torque performance.

Reuse acceptance must follow the agreed product specification and testing criteria.

Engineering Risk: Galvanic Corrosion

Aluminum may experience galvanic corrosion when electrically connected to dissimilar metals in the presence of an electrolyte.

Relevant factors include:

• Mating bolt material.

• Moisture exposure.

• Coating condition.

• Electrical contact.

• Joint geometry.

• Maintenance conditions.

Anodizing does not automatically eliminate galvanic corrosion risk.

Engineering Risk: Electrical Grounding

Anodized aluminum surfaces may affect electrical contact behavior.

Where a fastening joint is part of an electrical bonding or grounding path, engineers must validate the complete electrical connection.

A nylon insert does not make the complete fastening assembly electrically insulated.

JUXIN FASTENERS Manufacturing Capabilities

JUXIN FASTENERS is an industrial fastener manufacturer supporting OEM/ODM projects and industrial batch production.

Our broader manufacturing capabilities include:

• Cold heading.

• Cold forming.

• CNC machining.

• Threading and secondary machining.

• Product-specific secondary operations.

• Customer-defined surface finishing.

• Made-to-drawing production.

• Industrial batch manufacturing.

The actual manufacturing route for 6061 aluminum locknuts depends on material temper, geometry, tolerances and production requirements.

Not every aluminum locknut is necessarily cold formed.

Custom CNC Machining and Product Geometry

Customer-specific designs may require:

• Special hex dimensions.

• Modified nut height.

• Precision internal threads.

• Customized nylon insert retention geometry.

• Special flange configurations where specified.

• Additional machining features.

Manufacturing feasibility must be reviewed against the approved drawing.

OEM/ODM Customization Options

JUXIN FASTENERS can evaluate:

• Metric coarse and fine threads.

• UNC and UNF threads.

• Customer-specified 6061 temper.

• Special nut dimensions.

• Black anodized appearance.

• Approved physical color samples.

• Surface texture requirements.

• Nylon insert specifications.

• Prevailing-torque requirements.

• Mechanical acceptance criteria.

• OEM packaging.

• Industrial batch quantities.

Quality Inspection for Black Anodized Locknuts

Specific inspection methods and acceptance criteria must be agreed for each OEM program.

Engineering Standards and Technical References

DIN 985 and ISO 10511

DIN 985 is a historical designation associated with thin nylon-insert hex locknuts.

ISO 10511:2025 specifies thin prevailing-torque hexagon nuts with non-metallic inserts in steel and stainless steel.

These references do not automatically establish finished-product conformity for a custom 6061 aluminum locknut.

ISO 7040 and ISO 7041

ISO 7040 addresses regular-height prevailing-torque hexagon nuts with non-metallic inserts.

ISO 7041 addresses high prevailing-torque hexagon nuts with non-metallic inserts.

The correct configuration must be established from the approved drawing.

ISO Metric Thread Standards

Relevant references include:

• ISO 261 — Metric thread selection.

• ISO 724 — Basic metric thread dimensions.

• ISO 965 series — Metric thread tolerances.

ASME B1.1

ASME B1.1 provides requirements for Unified inch screw threads, including UNC and UNF.

It does not independently certify a finished aluminum locknut.

ASME B18.16.6

ASME B18.16.6 addresses defined inch-series nylon-insert locknut designs.

Its applicability to a custom aluminum product must be reviewed against the actual material, geometry and performance requirements.

Steel property grades must not automatically be assigned to aluminum nuts.

Aluminum Material Specification

The required 6061 temper and raw material form must be specified.

ASTM B221/B221M may be relevant to extruded aluminum bar stock within its scope.

A raw material standard does not independently certify the completed locknut.

Customer-Approved Engineering Drawing

The final product specification should define:

• Base material and temper.

• Thread designation and tolerance.

• Nut dimensions.

• Nylon insert material and geometry.

• Black anodizing requirements.

• Approved physical color sample.

• Prevailing-torque requirements.

• Mechanical performance requirements.

• Inspection and acceptance criteria.

Support for OEM Engineering and Purchasing Teams

Design and Mechanical Engineers

Review material suitability, thread loadability, joint preload and mating fastener compatibility.

Manufacturing Engineers

Evaluate installation tooling, tightening procedures, prevailing torque and finish protection.

Production Managers

Define assembly consistency, production handling, inspection requirements and batch identification.

Procurement and Supplier Development Teams

Confirm approved drawings, material requirements, samples, finish approval and manufacturing feasibility.

Supply Chain Managers

Coordinate engineering revisions, purchasing quantities, packaging and delivery requirements.

Frequently Asked Questions

What are black anodized aluminum nylon-insert lock nuts?

They are 6061 aluminum hex locknuts with retained nylon locking inserts and a black anodized finish.

Are these black zinc-plated steel nuts?

No. The featured product uses aluminum alloy 6061 and black anodizing.

Are these black oxide nuts?

No. Black oxide is a different surface treatment.

Are these matte black or gloss black?

The required surface texture and gloss level must be established using an approved sample.

What metric sizes are listed?

M3, M4, M5, M6, M8, M10 and M12.

Can JUXIN manufacture UNC or UNF threads?

Customer-specific inch-series designs can be evaluated against approved engineering drawings.

Are metric and UNC threads interchangeable?

No. They are different thread systems.

Can these nuts be used in AI data center cabinets?

They may be evaluated for suitable non-critical accessories after engineering validation.

Can these nuts be used on mountain bikes?

They may be considered for suitable non-critical accessory assemblies.

Can they be used on motorcycles and racing vehicles?

They may be evaluated for approved auxiliary equipment, not automatically for safety-critical joints.

Can JUXIN match a customer's black anodized finish?

Customer-defined appearance requirements can be evaluated using an approved physical master sample.

Can aluminum locknuts replace steel Class 10 locknuts?

Not automatically. Aluminum loadability must be independently evaluated.

Can nylon-insert locknuts be reused?

Reuse depends on prevailing-torque performance and the applicable acceptance requirements.

Are these suitable for high temperatures?

Only when the insert and finished assembly have been validated for the operating conditions.

Does JUXIN support OEM/ODM manufacturing?

Yes. JUXIN supports made-to-drawing custom fastener manufacturing and industrial batch production.

Request a Quote — Black Anodized 6061 Aluminum Nylon-Insert Lock Nut Manufacturer

JUXIN FASTENERS manufactures standard and custom-engineered industrial fasteners for international OEM, Tier-1 and Tier-2 manufacturing programs.

We support custom aluminum locknut projects for industrial equipment enclosures, robotics, 

AI data center cabinet accessories, electronics equipment, bicycle accessories, motorcycle components and precision machinery.

Our broader manufacturing capabilities include cold heading, cold forming, CNC machining, threading, secondary processing and customer-defined surface finishing.

Recommended RFQ Information

• Required metric or UNC/UNF thread.

• Aluminum 6061 temper.

• Customer 2D drawing or 3D CAD model.

• Nut height and hex dimensions.

• Nylon insert material requirements.

• Mating bolt specification.

• Required joint preload.

• Prevailing-torque acceptance criteria.

• Operating temperature and environment.

• Black anodized finish specification.

• Approved physical color sample.

• Mechanical performance requirements.

• Inspection and testing criteria.

• Order quantity and annual forecast.

• Packaging and delivery requirements.

Please send your drawings, technical specifications and purchasing requirements for engineering review and quotation.

JUXIN FASTENERS

Industrial Fastener Manufacturer | OEM/ODM Custom Fastener Manufacturing | Cold Heading, Cold Forming & CNC Machining

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

Email: info@juxinfasteners.com

Packaging Standard

At Juxin Fasteners, we apply standardized export packaging to ensure product protection, traceability, and compliance with international logistics requirements.

1. Standard Export Packaging

Unless otherwise specified, all products will be packed according to our factory standard export packaging, which includes:

Moisture-resistant inner protection

Poly bag or small box packing as required

Reinforced export cartons

Clear labeling with part number, specification, batch number, and quantity

Palletizing for sea or air shipment when necessary

Our standard packaging is designed to ensure safe transportation, efficient warehousing, and long-distance international shipping.

2. Customized Packaging Options

We also provide customized packaging solutions according to customer requirements, including but not limited to:

Private labeling

Customized barcodes

Specific carton dimensions

Retail packaging

Special pallet configuration

Customer-specific marking and identification

So that you know, customized packaging may involve additional costs and extended lead time depending on the complexity of the requirements.

3. Compliance & Quality Assurance

All packaging processes are controlled under our ISO 9001 quality management system to ensure consistency, traceability, and product integrity throughout the supply chain.