Loctite® 121078 is a high-strength, thixotropic anaerobic retaining compound formulated to bond cylindrical fitting parts. It delivers strong retention and excellent resistance to heat, vibration, and industrial oils. Suitable for components with up to 0.25 mm clearance, this green adhesive also fluoresces under UV light for easy inspection.
Loctite® 121078 is designed to secure close-fitting cylindrical assemblies such as shafts, bearings, bushings, and gears. It cures in the absence of air between tight metal surfaces, forming a durable bond that prevents loosening caused by shock and vibration. Its thixotropic nature ensures the adhesive stays in place without running, even on vertical surfaces. This makes it a dependable choice for industrial and automotive applications where long-term reliability is essential. With a service temperature range from –55°C to +175°C, Loctite® 121078 performs well even under demanding conditions.
Colour: Green
Viscosity: 3000 – 5000 mPa·s
Fixture Time on Steel: Approximately 3 minutes
Maximum Gap Fill: 0.25 mm
Full Cure Time: 24 hours
Service Temperature Range: –55°C to +175°C
Fluorescence: Yes (UV detectable)
Specific Gravity: ~1.15
Recommended Substrates: Steel, stainless steel, aluminium, brass
Packaging Sizes: Typically available in 50 ml and 250 ml bottles
Primary Chemistry: Methacrylate ester
High-strength formulation for permanent retention
Thixotropic viscosity prevents dripping and ensures clean application
Effective even in the presence of minor surface contamination such as oil
Fluoresces under UV light for visual inspection
Suitable for a wide range of industrial and automotive applications
Prevents loosening of rotating and cylindrical components due to shock and vibration
Reduces assembly failures caused by poor bonding or misalignment
Minimises downtime in maintenance environments by creating long-lasting joints
Improves safety and reliability of mechanical systems
Eliminates need for mechanical fasteners or press fits in many applications
Designed for retaining cylindrical parts such as bushings, bearings, shafts, and gears
Ideal for assemblies with up to 0.25 mm diametral clearance
Effective on active and passive metals
Used across maintenance, repair, and manufacturing operations in automotive and industrial sectors
Performs reliably in high-temperature and high-vibration environments
Suitable for use even on parts with light oil contamination
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