Loctite LOCTITE-263 (50-ml-Btl)

LOCTITE® 263™ High Strength Threadlocker

Overview

LOCTITE® 263™ is a high-strength, one-component anaerobic threadlocking adhesive designed for the permanent locking and sealing of threaded fasteners. It cures in the absence of air between close-fitting metal surfaces to prevent loosening caused by vibration, shock and thermal cycling. Engineered for heavy-duty industrial and aerospace applications, LOCTITE® 263™ provides reliable performance on both active and passive metals, including stainless steel and plated fasteners, while tolerating light oil contamination during assembly.

Key Technical Specs

• Product Type: High-strength anaerobic threadlocker
• Product Code: LOCTITE® 263™
• Technology: Acrylic (Dimethacrylate Ester)
• Colour: Red
• Components: One-component (no mixing required)
• Curing Mechanism: Anaerobic
• Secondary Cure: Activator compatible
• Viscosity: Low
• Specific Gravity: 1.1
• Brookfield Viscosity: Approximately 500 mPa�s
• Cone & Plate Viscosity: Approximately 450 mPa�s
• UV Fluorescence: Positive

Approvals & Specifications

• Tested to ISO 10964 for threadlocking performance
• Compressive shear strength tested to ISO 10123
• Suitable for heavy-duty industrial and aerospace fastening applications
• Compatible with LOCTITE® Activators 7471™, 7649™, 7088™ and 7091™

Performance Highlights

• Permanent locking and sealing of threaded fasteners
• Prevents loosening caused by vibration and shock
• Excellent performance on active and passive metals
• Works effectively on stainless steel and plated fasteners
• Oil tolerant, allowing assembly on lightly contaminated components
• High breakaway torque for secure fastening
• Excellent chemical resistance after curing
• Maintains performance at elevated temperatures
• Fluorescent under UV light for inspection and quality control

Typical Applications

• Motor housing studs
• Pump housing fasteners
• Industrial machinery assembly
• Aerospace mechanical fasteners
• Gearboxes and transmission assemblies
• Heavy-duty threaded connections exposed to vibration
• Permanent sealing of threaded fittings

Compatibility & Safety Notes

• Suitable for steel, stainless steel, brass, copper and plated metal fasteners
• Tolerates minor contamination from lubricating oils and corrosion protection fluids
• Not recommended for most thermoplastics due to potential stress cracking
• Not suitable for pure oxygen, oxygen-rich systems or chlorine service
• Refer to the Safety Data Sheet (SDS) before use
• Store unopened between 8°C and 21°C for optimum performance

Application & Curing

• Clean threaded surfaces before application where possible
• Shake bottle thoroughly before use
• Apply directly to male or female threads depending on assembly type
• For blind holes, apply adhesive to the lower third of the internal thread
• For sealing applications, apply a continuous 360° bead around the leading threads
• Assemble and tighten immediately after application
• Where faster cure is required, use a compatible LOCTITE® activator
• For disassembly, heat the fastener locally to approximately 250°C before removal

Packaging & Procurement

• Supplied ready to use as a one-component liquid adhesive
• Available in multiple commercial packaging sizes depending on regional distributor
• Compatible with standard LOCTITE® dispensing equipment

Why This Product is Chosen for AOG / MRO

• Provides permanent locking of safety-critical fasteners
• Excellent vibration resistance for aircraft and industrial equipment
• Reliable curing on stainless steel and plated hardware
• Oil-tolerant formulation simplifies maintenance work
• Reduces maintenance caused by fastener loosening

Practical Suggestions for Your Team

• Clean threads whenever practical to maximise bond strength
• Use an activator on inactive metals or where rapid cure is required
• Avoid contaminating the bottle nozzle with metal surfaces during application
• Apply only enough product to fully fill thread engagement
• Use controlled heat for safe disassembly of permanently locked fasteners

Manufacturer / Aviation Spec Codes

• Product Name: LOCTITE® 263™
• Manufacturer: Henkel
• Product Type: High-strength anaerobic threadlocker
• Technology: Acrylic (Dimethacrylate Ester)
• Application: Permanent threadlocking and thread sealing
• Performance Standards: ISO 10964 / ISO 10123