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May. 14, 2024
In modern industrial manufacturing, threaded connections are widely used in automotive systems, mechanical equipment, electronic products, and structural assemblies. However, under continuous vibration, impact loads, temperature changes, and dynamic working conditions, traditional bolts and screws may gradually lose preload force, resulting in loosening and potential safety risks.
To improve fastening reliability, many manufacturers use pre-applied thread locking screws, also known as patch lock screws, nylon patch screws, or anti-loosening bolts.
These specially treated fasteners are coated with an engineering resin or polymer locking material on the thread surface before assembly. During installation, the coating creates additional friction and locking force between the bolt and nut, effectively preventing unwanted rotation caused by vibration or external loads.
As a professional OEM fastener manufacturer, JUXIN FASTENERS supplies customized pre-coated thread locking screws and vibration-resistant fastening solutions for global automotive, EV, machinery, and industrial equipment manufacturers.
Pre-applied thread locking screws are standard bolts or screws with a special anti-loosening coating applied to the threaded area before delivery.
Unlike traditional liquid threadlocker applied manually during assembly, pre-applied locking fasteners provide:
Consistent coating quality
Faster assembly process
Reduced production labor
Improved fastening reliability
Cleaner manufacturing environment
The coating is usually made from special engineering polymers such as:
Nylon resin
Polyamide materials
Microencapsulated adhesive compounds
When the screw is tightened into the mating thread, the coating fills microscopic gaps between threads and generates resistance against loosening.
The main reason bolts become loose is the loss of preload force caused by:
Mechanical vibration
Impact loading
Thermal expansion and contraction
Transverse forces
Repeated assembly cycles
During operation, external forces can overcome the friction between bolt threads and connected parts, causing rotational loosening.
Pre-coated anti-loosening bolts solve this problem by increasing thread friction and improving connection stability.
The locking mechanism includes:
The polymer coating creates additional friction between male and female threads, increasing the torque required for loosening.
The elastic locking layer absorbs minor movement between threads, preventing rotation caused by vibration.
The coating fills small gaps between threads, improving sealing performance and reducing the risk of contamination.
The coating provides additional surface protection, helping prevent moisture penetration and corrosion.
The biggest advantage of patch lock screws is their ability to maintain stable fastening performance under vibration and dynamic loads.
They are widely used in:
Automotive components
Engine systems
EV battery structures
Industrial machinery
Railway equipment
Electronic devices
Because the locking compound is already applied before shipment, manufacturers do not need additional liquid adhesive during production.
Benefits include:
Faster assembly lines
Reduced operator workload
Lower risk of incorrect adhesive application
Cleaner production processes
This is especially important for high-volume OEM manufacturing.
Depending on the coating type and application requirements, some nylon patch screws can maintain locking performance after removal and reinstallation.
This provides additional convenience for maintenance and service operations.
High-quality thread locking coatings provide resistance against:
Oil
Fuel
Cleaning chemicals
Industrial fluids
Environmental moisture
Typical working temperature ranges can reach:
-40°C to +150°C
depending on the coating material and application requirements.
Nylon patch locking is one of the most common solutions for industrial fasteners.
Features:
Reliable vibration resistance
Good chemical stability
Easy installation
Suitable for repeated assembly
Applications:
Automotive parts
Electrical equipment
Machinery assemblies
This type uses a dry adhesive coating that activates during installation.
Advantages:
High locking performance
Excellent consistency
Suitable for automated assembly
Common applications:
Automotive OEM production
Aerospace equipment
Precision machinery
For special applications, manufacturers may require customized solutions including:
Different coating positions
Different locking torque requirements
Specific temperature resistance
Special thread standards
JUXIN FASTENERS provides custom anti-loosening fasteners according to customer drawings and technical specifications.
Automotive manufacturers widely use anti-loosening bolts because vehicle systems experience continuous vibration and dynamic loads.
Applications include:
Chassis components
Steering systems
Suspension systems
Brake systems
Seat structures
EV battery assemblies
Many global automotive manufacturers use additional locking solutions such as coated bolts, locking washers, and special thread designs to improve vehicle safety.
With the rapid development of electric vehicles, reliable fastening solutions are critical for battery packs and structural components.
Pre-coated locking fasteners are used for:
Battery module assembly
Battery enclosure systems
Electrical connections
Lightweight structural components
Industrial equipment requires long-term fastening reliability under continuous operation.
Applications include:
Automation equipment
CNC machinery
Production lines
Hydraulic equipment
Heavy-duty machinery
Electronic equipment often requires compact and secure fastening solutions.
Applications include:
Control cabinets
Communication equipment
Power systems
Electronic housings
For optimal performance, manufacturers should follow proper installation procedures.
Before assembly:
Remove oil contamination
Remove dust and debris
Ensure clean mating threads
A clean surface ensures better locking performance.
During tightening:
Use the correct torque specification
Avoid damaging the coating
Ensure complete thread engagement
Some adhesive coatings require curing time after installation to achieve maximum performance.
The curing process depends on:
Temperature
Humidity
Coating type
Material combination
Engineers should consider the following factors:
Vibration level
Temperature range
Chemical exposure
Outdoor conditions
Bolt size
Thread specification
Material
Surface treatment
Required locking torque
Automatic assembly
Manual installation
Maintenance frequency
Reusability requirements
Selecting the correct pre-applied thread locking solution ensures long-term reliability and reduces maintenance costs.
JUXIN FASTENERS specializes in manufacturing OEM fasteners and customized locking solutions for global industrial customers.
Our capabilities include:
✔ Pre-applied thread locking screws
✔ Nylon patch lock bolts
✔ Custom anti-loosening fasteners
✔ Automotive-grade fastening solutions
✔ Special surface treatments
✔ OEM production according to drawings
We support industries including:
Automotive
New Energy Vehicles
Industrial Equipment
Electrical Cabinets
Railway Transportation
Medical Equipment
Machinery Manufacturing
With advanced manufacturing capability and professional engineering support, we help customers improve fastening reliability and production efficiency.
If you are looking for a reliable pre-applied thread locking screw manufacturer, anti-loosening fastener supplier, or OEM fastening partner, our engineering team is ready to support your project.
Email: info@juxinfasteners.com
Website: www.juxinfasteners.com
JUXIN FASTENERS
Precision Fastening Solutions for Global OEMs Since 2003
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