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Hexagon lock nut​

Hexagon lock nut​

A Hexagon lock nut is a specialized mechanical fastener designed with an internal locking mechanism to prevent unintended loosening caused by vibration, torque, or dynamic loads. Unlike standard hex nuts, these components incorporate specific design features—such as nylon inserts, deformed threads, or serrated faces—to increase friction between the nut and the mating bolt. This ensures the integrity of bolted joints in critical assemblies where constant tension is required. Manufactured according to international standards such as DIN 985, ISO 7040, or ASME B18.16.6, these nuts are typically produced from carbon steel, stainless steel, or alloy steel to meet various tensile strength requirements and environmental conditions.
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DIN 985 ISO 7040 ASME B18.16.6
Specification Sheet · Rev 06.2026

Hexagon Lock Nut

Prevailing torque type · Vibration-resistant engineered fasteners
Class 8-12 Strength grades
-60°C to 400°C Thermal range
>15 cycles Reusability (avg)
“

A Hexagon lock nut is a specialized mechanical fastener designed with an internal locking mechanism to prevent unintended loosening caused by vibration, torque, or dynamic loads. Unlike standard hex nuts, these components incorporate specific design features—such as nylon inserts, deformed threads, or serrated faces—to increase friction between the nut and the mating bolt. This ensures the integrity of bolted joints in critical assemblies where constant tension is required. Manufactured according to international standards such as DIN 985, ISO 7040, or ASME B18.16.6, these nuts are typically produced from carbon steel, stainless steel, or alloy steel to meet various tensile strength requirements and environmental conditions.

01

Core Technical Advantages

performance metrics
01
Vibration Resistance
prevailing torque ISO 16130

The integrated locking element provides a prevailing torque that maintains clamping force even under high-frequency mechanical oscillation. Certified for aerospace and automotive chassis applications.

98% retention after 2000 cycles
02
Reusable Functionality
nylon insert all-metal

Many variants, particularly nylon-insert types, allow for multiple assembly and disassembly cycles without total loss of locking capability. Up to 15 reuses retained within OEM specifications.

85% torque retention after 10 cycles
03
Structural Compactness
DIN EN 1665

The hexagonal geometry conforms to standard wrench sizes, allowing for high-torque installation in confined industrial spaces. Low-profile designs reduce weight by up to 18%.

100% tool compatibility
04
Cost Efficiency
no secondary

Eliminates the need for secondary locking hardware such as spring washers, cotter pins, or chemical thread lockers. Reduces assembly time by approximately 23% compared to traditional methods.

76% lower total applied cost
02

Key Product Features

technical comparison

The performance of a Hexagon lock nut is determined by its material grade and locking mechanism. The following table outlines the detailed technical specifications of common industrial types.

comparative matrix · locking mechanism vs environment
Feature parameter Nylon Insert Lock Nut All-Metal Prevailing Torque Nut
Locking Mechanism
primary method		 Non-metallic nylon collar with controlled interference fit
PA66 + 25% glass fiber		 Elliptical or distorted threads creating radial pressure
Tri-lobular / offset thread
Temperature Range
operating limits		 Up to 120°C (Standard nylon)
High-temp variant: +180°C		 Up to 400°C (Stainless steel / Inconel)
Cryogenic: -60°C capability
Corrosion Protection
coating options		 Zinc plating (Cr3+), Chrome, SS304/316
Salt spray >720h with Dacromet		 Zinc flake (Geomet), Phosphate, Plain oil
Hot-dip galvanized available
Application Speed
torque behaviour		 Standard tool compatible · no torque adjustment
Prevailing torque stable after 3 runs		 Requires higher initial torque · precision installation
+25% breakaway torque vs nylon
All variants comply with RoHS, REACH and conflict minerals regulations · full traceability available
03

Primary Application Scenarios

industry proven
AUTO
Automotive Tier 1

Automotive Engineering

Securement of suspension components, engine mounts, and drivetrain assemblies subject to constant road vibration. Validated to VDA and SAE J2535 standards.

M6–M20 property class 10/12
IND
Heavy machinery

Industrial Machinery

Fastening of rotating shafts, conveyor systems, and hydraulic equipment where safety-critical joints are paramount. Approved for press and forming machines.

M10–M36 grade DH / CH
REN
Renewables

Renewable Energy

Assembly of wind turbine towers and solar racking systems exposed to variable outdoor wind loads. Offshore corrosion protection available (ISO 12944 C5-M).

M12–M42 HV500 / HDG
APPL
Consumer appliances

Consumer Appliances

Internal motor mounts for high-speed agitators in washing machines and heavy-duty electric tools. UL recognized component for vibration control.

M4–M12 class 8 / SS304
04

Handling and Storage Guidelines

technical compliance
G1
Environmental Storage
critical
Store in a cool, dry warehouse environment to prevent oxidation. For carbon steel nuts, maintaining a relative humidity below 50% is recommended to preserve the integrity of the zinc or phosphate coating. Maximum shelf life: 24 months unopened.
ISO 9227 corrosion test compliance required for maritime storage
G2
Installation Notice
high torque
Avoid using high-speed impact drivers on nylon-insert lock nuts, as excessive frictional heat can melt the nylon collar and compromise the locking torque. Manual or low-speed torque wrenches are preferred for precision tensioning.
Recommended installation speed < 300 RPM for nylon variants
G3
Thread Compatibility
fit class
Ensure the bolt thread class matches the nut thread class (e.g., 6G/6H) to avoid thread galling, particularly when using stainless steel fasteners. Use thread gauges for verification.
Lubricated assembly may require torque reduction of 15-25%
G4
Lubrication Warning
calibration required
Applying anti-seize or lubricants can significantly alter the torque-tension relationship; adjustment of installation torque values is necessary if lubrication is utilized. Consult engineering data sheet for corrected values.
Dry torque vs lubricated torque: variance up to 40%
manufacturing standards
DIN 985 · ISO 7040 · ASME B18.16.6 · ASTM A563 · SAE J995 · NF E25-401
material options
Carbon steel (8, 10, 12) · Stainless steel A2/A4 · Alloy steel 4140 · Inconel 718
surface treatments
Zinc plating · Zinc flake (Geomet 500) · Phosphate + oil · Hot-dip galvanizing · Xylan coating

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Zhejiang Donghe Machinery Technology Co., Ltd.

 

Zhejiang Donghe Machinery Technology Co., Ltd. offer Wholesale Hexagon lock nut​ Manufacturers. Our company passed the ISO9001:2000 quality management certification system standard in 2017 and is an enterprise with self-operating import and export rights.
Our company produces various international industrial standard products, including Chinese GB standards, German DIN standards, American ANSI standards, British B standards, and so on. In addition, our company can customize various non-standard fasteners according to customer requirements. The products are exported to Europe, Australia, Africa, the United States, and other regions. We always provide customers with good product and technical support, and sound after-sales service.

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