Loctite® 266 is a high-strength, high-temperature anaerobic threadlocker designed for the permanent locking and sealing of threaded fasteners. It cures in the absence of air between close-fitting metal surfaces, providing robust resistance to heavy shock, vibration, and thermal cycling. The adhesive is particularly effective on passive substrates such as stainless steel and plated surfaces and is tolerant of slight contamination from industrial oils.
Loctite® 266 is a one-component, anaerobic adhesive formulated for the permanent locking and sealing of threaded fasteners. Its high viscosity and thixotropic nature prevent migration after application, making it ideal for overhead and vertical applications. The product cures in the absence of air between close-fitting metal surfaces, forming a durable bond that resists loosening due to heavy shock, vibration, and thermal expansion. Loctite® 266 is particularly effective on less active substrates such as stainless steel and plated surfaces and can cure through light coatings of industrial oils and cutting fluids without the need for prior cleaning. The adhesive exhibits high-temperature resistance up to 232°C, ensuring long-term reliability in demanding environments.
Colour: Red-orange
Viscosity: 7,000 to 11,000 mPa·s at 25°C
Breakaway Torque: 30 Nm (M10 steel bolts)
Prevail Torque: 9 Nm (M10 steel bolts)
Fixture Time: 10 minutes on steel
Full Cure Time: 24 hours
Service Temperature Range: -55°C to +232°C
Specific Gravity: 1.19
Fluorescence: Yes, under UV light
Recommended for: Steel, stainless steel, brass, and plated surfaces
Packaging Sizes: 10 ml, 50 ml, and 250 ml bottles
High-strength formulation for permanent locking of threaded fasteners
High viscosity and thixotropic nature prevent migration after application
Suitable for use on less active substrates like stainless steel and plated surfaces
Tolerant of slight contamination from industrial oils
High-temperature resistance up to 232°C
Prevents loosening of threaded fasteners due to heavy shock, vibration, and thermal cycling
Eliminates the need for mechanical locking devices
Seals threads to prevent leakage and corrosion
Reduces maintenance by providing long-term locking and sealing
Enables reliable assembly without the need for prior cleaning of lightly oiled surfaces
Permanent locking of threaded fasteners in heavy-duty machinery
Securing bolts and studs in engines, gearboxes, and pumps
Preventing loosening of fasteners in vibrating assemblies
Sealing threads to prevent leakage of gases and liquids
Applications requiring high-temperature resistance up to 232°C
Use on less active substrates such as stainless steel and plated surfaces
Suitable for assemblies with light oil contamination without prior cleaning
Maintenance and repair operations in industrial equipment
Automotive and heavy machinery threaded components
Electrical and electronic equipment assemblies
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