Loctite® 278 is a high-strength, medium-viscosity threadlocker designed for the permanent locking and sealing of threaded fasteners. It cures anaerobically between close-fitting metal surfaces, providing robust resistance to vibration, shock, and thermal cycling. The adhesive is oil-tolerant, allowing for reliable performance even on surfaces with light oil contamination.
Colour: Green
Viscosity: 2,400 to 3,600 mPa·s at 25°C
Breakaway Torque: 42 N·m (M10 steel bolts)
Prevail Torque: 23 N·m (M10 steel bolts)
Fixture Time: 20 minutes on steel and brass, 60 minutes on stainless steel
Service Temperature Range: -55°C to +200°C
Specific Gravity: 1.08
Fluorescence: Yes, under UV light
Packaging Sizes: 50 ml and 250 ml bottles
Primary Chemistry:
Methacrylate ester
Loctite® 278 is a one-component, anaerobic adhesive formulated for the permanent locking and sealing of threaded fasteners. Its medium viscosity ensures easy application without migration, making it suitable for vertical or overhead assemblies. The product cures in the absence of air between close-fitting metal surfaces, forming a durable bond that resists loosening due to vibration and thermal expansion. Loctite® 278 is particularly effective on less active substrates such as stainless steel and plated surfaces, and it 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 200°C, ensuring long-term reliability in demanding environments.
Colour: Green
Viscosity: 2,400 to 3,600 mPa·s at 25°C
Breakaway Torque: 42 N·m (M10 steel bolts)
Prevail Torque: 23 N·m (M10 steel bolts)
Fixture Time: 20 minutes on steel and brass, 60 minutes on stainless steel
Service Temperature Range: -55°C to +200°C
Specific Gravity: 1.08
Fluorescence: Yes, under UV light
Packaging Sizes: 50 ml and 250 ml bottles
Primary Chemistry:
Methacrylate ester
Prevents loosening of threaded fasteners due to 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 200°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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