LOCTITE 263 Threadlocker – High-Strength Oil-Tolerant for Heavy-Duty Metal Fasteners

LOCTITE 263 Threadlocker is a high-strength anaerobic adhesive designed to permanently secure and seal threaded metal fasteners. Engineered for demanding industrial applications, it effectively prevents loosening caused by vibration, shock, and thermal expansion while protecting threaded assemblies from leakage and corrosion.

Suitable for both manual and automated dispensing systems, LOCTITE 263 delivers reliable locking performance on active and passive metal surfaces, even in the presence of light oil contamination. Its primerless formulation simplifies assembly while improving production efficiency.

Product Overview

Product Category: Threadlockers

Technology: Acrylate-based anaerobic adhesive

Curing Mechanism: Anaerobic cure

Application: Threadlocking of threaded fasteners

Physical Form: Liquid

Color: Red

Key Product Features

LOCTITE 263 is developed for high-strength threadlocking applications where long-term reliability is essential.

Its primary advantages include:

• High-strength locking performance

• Excellent resistance to vibration and mechanical shock

• Oil-tolerant formulation for improved assembly flexibility

• Primerless application on most metal substrates

• Fluorescent properties for easy inspection after application

• Can be disassembled using heat when maintenance is required

These features make it suitable for demanding industrial environments requiring secure fastening performance.

Technical Specifications

Reliable Threadlocking Performance

LOCTITE 263 provides excellent locking strength for threaded metal fasteners exposed to vibration, dynamic loads, and harsh operating conditions.

Once cured, the adhesive fills the gaps between mating threads, creating a durable bond that helps:

• Prevent fastener loosening

• Resist vibration-induced movement

• Reduce leakage through threaded assemblies

• Protect against corrosion and environmental contamination

Its high breakaway and prevailing torque values make it particularly suitable for applications where secure fastening is critical.

Broad Material Compatibility

LOCTITE 263 is recommended for use on a wide variety of metal fasteners, including both active and passive metal surfaces.

Compatible materials include:

• Carbon steel

• Stainless steel

• Aluminum

• Other common industrial metals

The product's oil-tolerant formulation enables effective bonding even when light residual oil remains on component surfaces, reducing cleaning requirements before assembly.

Fast Curing and Efficient Assembly

The anaerobic curing system begins polymerization once the adhesive is confined between metal surfaces and isolated from air.

With a fixture time of approximately 10 minutes, LOCTITE 263 supports faster production while maintaining reliable bonding performance.

The product can be applied using:

• Manual dispensing

• Automated dispensing systems

This flexibility makes it suitable for both maintenance operations and high-volume manufacturing environments.

Operating Temperature Range

LOCTITE 263 maintains stable performance across a wide operating temperature range of -55°C to 180°C (-65°F to 360°F).

Its thermal resistance allows reliable operation in equipment exposed to:

• High temperatures

• Temperature cycling

• Industrial machinery

• Automotive applications

• Heavy equipment

Typical Applications

LOCTITE 263 is widely used in industrial sectors requiring permanent threadlocking performance, including:

• Industrial equipment manufacturing

• Automotive assembly

• Construction machinery

• Pumps and valves

• Gearboxes

• Electric motors

• Heavy machinery

• General mechanical fastening

It is particularly effective for securing bolts, nuts, studs, and threaded fittings that must remain securely locked during long-term service.

Certifications and Compliance

LOCTITE 263 complies with NSF/ANSI Standard 61, demonstrating its suitability for specified industrial applications where certified performance is required.

Trusted High-Strength Threadlocking Solution

Combining high locking strength, fast curing, oil tolerance, and excellent temperature resistance, LOCTITE 263 Threadlocker provides a dependable solution for permanent threaded assembly applications. Its reliable performance helps reduce maintenance requirements, improve equipment reliability, and ensure long-term fastening security across a wide range of industrial environments.