High-Profile Nylon-Insert Hex Lock Nuts | Style 2

High-Profile Nylon-Insert Hex Lock Nuts — Style 2

ISO 7041 High Hex Prevailing-Torque Nuts for OEM Manufacturing

Juxin Fasteners manufactures high-profile nylon-insert hex lock nuts for industrial machinery, automotive equipment, electrical systems, manufacturing equipment and custom OEM fastening assemblies.

Also described as Style 2 nylon-insert locknuts or high hex nylon lock nuts, these fasteners incorporate a non-metallic locking insert inside an elevated hexagonal nut body.

The insert engages the mating bolt thread during installation, generating prevailing torque that helps resist unintentional nut rotation.

Unlike a conventional hex nut, the locking action is not dependent solely on the clamping force between the nut and the mating surface.

The high-profile configuration is distinct from regular-height and thin-pattern nylon-insert locknuts.

Juxin Fasteners supports standard and custom-engineered industrial fasteners through cold heading, cold forming, CNC machining and product-specific secondary operations. 

Manufacturing methods are selected according to product geometry, material, dimensional tolerances and production requirements.

Product Overview

The product photograph shows a hexagonal nut with an insert visible at one end.

The exact dimensions, material property class, insert composition and coating specification require confirmation against the technical drawing.

What Is a Style 2 Nylon-Insert Locknut?

A Style 2 nylon-insert locknut is a high-profile hexagonal nut containing a non-metallic locking element.

The insert creates resistance as the mating bolt passes through the nut.

This resistance is called prevailing torque.

The locking element helps maintain resistance to nut rotation even when the joint is not relying exclusively on bearing-surface friction.

Style 2 refers to the high-nut geometry, not simply to the material strength.

It is important to distinguish the height series from the mechanical property class.

How the Nylon Insert Locking Mechanism Works

Initial Thread Engagement

The bolt first engages the metallic internal thread.

Contact with the Locking Insert

As installation continues, the bolt reaches the non-metallic insert.

Prevailing Torque Generation

The insert elastically deforms around the mating thread and generates resistance to rotation.

Joint Tightening

The nut is tightened to the specified assembly condition.

The installation procedure must account for prevailing torque as well as the torque needed to establish joint preload.

Resistance to Loosening

The insert provides rotational resistance under suitable service conditions.

Its effectiveness depends on insert material, temperature, thread fit, installation conditions and repeated use.

High-Profile vs. Regular and Thin Nylon-Insert Locknuts

Nylon-insert locknuts are available in different height configurations.

These standards are not interchangeable solely because the thread diameter matches.

Overall height, wrenching dimensions, loadability and the applicable performance requirements must be checked.

ISO 7041:2025 Engineering Reference

ISO 7041:2025 specifies prevailing-torque hexagon high nuts with non-metallic inserts.

The published scope covers steel and stainless steel designs with metric coarse-pitch threads from M5 to M39 and product grades A and B.

The standard defines a high-nut family distinct from regular and thin-pattern designs.

An OEM drawing should identify the applicable edition and any additional dimensional, material or performance requirements.

Juxin Fasteners can evaluate manufacturing requirements against customer specifications. Compliance must be established for the actual product rather than assumed from its appearance.

Metric Thread Reference Table

The following are common ISO metric coarse-thread designations relevant to engineering selection.

These are thread references, not a declaration of Juxin Fasteners inventory or confirmed manufacturing sizes.

The full ISO 7041 standard covers a broader nominal diameter range.

Unified Inch-Thread References for North American OEMs

For equipment using inch-series fasteners, Juxin Fasteners can evaluate custom nylon-insert locknut designs based on UNC or UNF threads.

These thread designations are engineering references for potential custom designs.

An inch-thread nut must be designed and verified to the applicable Unified thread and locknut requirements. ISO 7041 dimensions cannot automatically be applied to an inch-thread nut.

Metric and Unified threads are not directly interchangeable.

Carbon Steel Material Selection

Carbon steel is the identified material for this product.

Material selection depends on:

• Required mechanical property class

• Thread size

• Forming characteristics

• Heat treatment requirements

• Proof-load requirements

• Surface treatment

• Production volume

• Cost and manufacturing feasibility

The material grade alone does not establish the finished nut's mechanical property class.

High-Strength Nylon-Insert Locknuts

Some industrial applications require high-strength nylon-insert locknuts.

For metric products, a specified ISO property class must be verified according to the relevant requirements.

Property Class 10 is an important purchasing designation for certain high-strength metric nuts, but it should not be assumed for every Style 2 product.

North American inch-series locknuts may use SAE or other specified strength classifications.

SAE Grade 8 and metric Property Class 10 belong to different designation systems and should not be presented as identical certifications.

Nylon Insert Material and Temperature

The locking insert is a critical functional component.

Selection should consider:

• Polymer grade

• Operating temperature

• Installation temperature

• Chemical exposure

• Moisture conditions

• Thread geometry

• Repeated assembly

• Required prevailing torque

Conventional nylon inserts may lose mechanical performance at elevated temperatures.

The allowable service temperature must be based on the actual insert specification and application requirements.

For elevated-temperature applications, an all-metal prevailing-torque locknut may be more suitable.

Surface Finish Options

Carbon steel nylon-insert locknuts may be manufactured with customer-specified surface treatments.

Potential finishes for evaluation include:

• Zinc plating

• Zinc yellow-chromate conversion coating

• Black oxide

• Black phosphate

• Zinc alloy coating

• Zinc flake coating

• Other specified industrial finishes

Coating selection should consider the operating environment, dimensional tolerances and compatibility with the locking insert.

Corrosion resistance must be verified according to the specified coating system and test requirements.

A particular finish does not automatically guarantee suitability for all outdoor, marine or chemically aggressive environments.

Prevailing Torque and Reusability

Nylon-insert locknuts may be reusable under suitable conditions, but prevailing torque can change with repeated installation and removal.

Reusability should not be described as an unlimited feature.

Relevant factors include:

• Number of installation cycles

• Thread condition

• Insert deformation

• Temperature exposure

• Surface coatings

• Lubrication

• Required prevailing torque

Where reuse is permitted, the relevant product standard or OEM specification should define acceptable prevailing-torque limits and inspection criteria.

For critical applications, replacement rather than reuse may be required.

Nylon-Insert vs. All-Metal Locknuts

Neither design should be selected solely on the assumption that one provides universally superior vibration resistance.

Style 2 Nylon-Insert Locknuts vs. Flange Locknuts

A Style 2 high-profile hex locknut has a conventional hexagonal bearing configuration.

A nylon-insert flange locknut incorporates an integral flange that increases the bearing contact area.

These designs differ in overall geometry and joint contact conditions.

An OEM drawing should identify the intended configuration.

Automotive and EV Applications

High-profile nylon-insert locknuts may be evaluated for selected automotive and electric vehicle equipment connections.

Potential applications include:

• Auxiliary equipment brackets

• Manufacturing fixtures

• Mechanical supports

• Vehicle accessory assemblies

• Noncritical vibration-exposed connections

For suspension, steering or other safety-critical systems, the specific fastener must meet the relevant OEM engineering, testing and approval requirements.

Industrial Machinery Applications

Potential applications include:

• Machine frames

• Pump mounting assemblies

• Motor accessories

• Mechanical equipment supports

• Gearbox accessories

• Industrial brackets

Engineers should evaluate the applied load, vibration conditions, thread engagement and operating temperature.

Pumps, Valves and Fluid-Handling Equipment

Nylon-insert locknuts may be used in selected external mechanical connections on pumps, valves and fluid-handling equipment.

Potential applications include:

• Equipment mounting brackets

• Actuator supports

• External mechanical fixtures

• Auxiliary assemblies

Chemical exposure and temperature must be assessed, particularly where the locking insert may contact aggressive fluids or vapors.

HVAC Equipment

Heating, ventilation and air-conditioning equipment may use nylon-insert locknuts in suitable mechanical assemblies.

Potential applications include:

• Fan mounting hardware

• Equipment brackets

• Motor support assemblies

• Mechanical enclosures

• Auxiliary supports

The locking insert must be suitable for the operating temperature.

Electrical Enclosures and Power Distribution

Potential applications include:

• Cabinet mounting brackets

• Control panel mechanical supports

• Equipment accessories

• Enclosure hardware

Mechanical fastening requirements should be distinguished from electrical bonding requirements.

Industrial Automation and Robotics

Automation systems may use nylon-insert locknuts in suitable mechanical support assemblies.

Production engineers should evaluate:

• Installation accessibility

• Torque control

• Vibration exposure

• Assembly cycle time

• Replacement procedures

• Inspection requirements

Energy Storage and Power Electronics

Potential applications include mechanical enclosure and support connections in energy storage and power electronics equipment.

Fastener selection must account for thermal conditions, vibration, corrosion and electrical safety requirements.

Data Center and Server Infrastructure

Nylon-insert locknuts may be evaluated for selected mechanical infrastructure assemblies, including equipment frames, brackets and auxiliary support structures.

The use of a locking nut must be justified by the actual joint design and service conditions.

Rail and Transportation Equipment

Transportation equipment may require locking fasteners for selected mechanical connections.

The appropriate fastener must be chosen according to the equipment specification, operating conditions and required verification.

No rail-specific certification is implied.

Production Engineering and Assembly Efficiency

For production managers, a nylon-insert locknut can provide a self-contained prevailing-torque feature without requiring a separate locking washer in suitable applications.

However, installation torque must account for both prevailing torque and the torque required to establish clamp load.

Assembly procedures should consider:

• Tool selection

• Installation speed

• Torque control

• Thread condition

• Lubrication

• Insert engagement

• Inspection frequency

• Rework procedures

OEM/ODM Manufacturing Capabilities

Juxin Fasteners is an industrial fastener manufacturer supporting standard and custom-engineered locking components.

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

The manufacturing route for a particular locknut depends on its material, dimensions, geometry, tolerances and production quantity.

We support engineering drawing review, manufacturing feasibility assessment and made-to-drawing production.

Custom Manufacturing Options

Customer-specific requirements may include:

• Metric coarse threads

• Custom metric fine threads

• UNC and UNF threads

• Nut height

• Hexagon dimensions

• Insert retention geometry

• Insert material

• Mechanical property class

• Material grade

• Surface finish

• Thread tolerances

• Customer-specific inspection requirements

• Packaging configuration

All custom designs require engineering and manufacturing feasibility review.

Quality Inspection and Functional Validation

Depending on the customer specification, inspection may include:

• Material verification

• Thread gauging

• Hexagon dimensions

• Overall height

• Insert dimensions

• Insert retention

• Surface finish

• Coating thickness

• Mechanical property verification

• Proof-load testing

• Prevailing-torque testing

• Repeated installation testing where specified

Functional acceptance criteria should be established according to the applicable product standard or approved OEM specification.

Relevant International Standards

These standards apply to different product configurations and technical requirements.

They should not be treated as interchangeable or as evidence that every manufactured nut automatically complies with them.

Frequently Asked Questions

What is a Style 2 nylon-insert locknut?

It is a high-profile hexagonal locknut containing a non-metallic prevailing-torque insert.

What standard applies to Style 2 metric nylon-insert locknuts?

ISO 7041:2025 is the principal international reference for the high-nut family with metric coarse threads.

How is Style 2 different from DIN 985?

Style 2 is a high-nut configuration, while DIN 985 is associated with a thin-pattern nylon-insert locknut. Their dimensions and loadability requirements differ.

Does a nylon-insert locknut resist vibration?

It can provide resistance to loosening under suitable conditions. The complete joint must still be designed and validated.

Can nylon-insert locknuts be reused?

Reuse depends on the product specification, installation history and remaining prevailing-torque performance.

Are nylon-insert locknuts suitable for high temperatures?

Their suitability depends on the actual polymer insert and operating conditions.

Can Juxin Fasteners manufacture Property Class 10 nylon-insert locknuts?

Customer-specific high-strength requirements can be evaluated. The required property class and testing criteria must be confirmed before quotation.

Are Grade 8 and Class 10 the same?

No. They belong to different fastener classification systems and must be evaluated according to the relevant specifications.

Can Juxin Fasteners manufacture UNC and UNF versions?

Custom Unified inch-thread designs can be evaluated according to customer drawings and manufacturing feasibility.

Are metric and inch threads interchangeable?

No. Thread diameter, pitch, form and tolerance must match the mating fastener.

Can Juxin Fasteners manufacture custom nylon-insert locknuts?

Yes. We support OEM/ODM made-to-drawing industrial fastener manufacturing, subject to engineering review.

Request a Quote — Style 2 Nylon-Insert Lock Nuts

Juxin Fasteners supports global OEM, Tier-1 and Tier-2 manufacturing programs requiring high-profile nylon-insert locknuts and custom industrial fastening components.

Our manufacturing capabilities combine cold heading, cold forming, CNC machining and product-specific secondary operations according to engineering requirements.

For an accurate manufacturing quotation, please provide:

• 2D engineering drawing or 3D CAD model

• Customer part number

• Thread diameter and pitch

• Metric, UNC or UNF designation

• Required nut height and hexagon dimensions

• Material grade

• Mechanical property class

• Nylon insert material

• Operating temperature

• Surface treatment

• Dimensional tolerances

• Prevailing-torque requirements

• Proof-load requirements

• Inspection and acceptance criteria

• Initial order quantity

• Annual demand forecast

• Packaging requirements

• Target delivery schedule

Our engineering team can review your specifications for manufacturing feasibility, custom production and long-term OEM supply.

Juxin Fasteners

Industrial Fastener Manufacturer | Style 2 Nylon-Insert Locknuts | OEM/ODM Locknut Manufacturing

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.