Loctite® 273 is a high-strength, medium-viscosity, methacrylate ester threadlocker designed for the permanent locking and sealing of threaded fasteners (M25 and larger). It cures anaerobically between close-fitting metal surfaces, providing robust resistance to vibration, shock, and thermal cycling. The adhesive is fluorescent under UV light for easy inspection.
Colour: Red
Viscosity: 400 to 600 mPa·s at 25°C
Breakaway Torque: 25 Nm (M10 steel bolts)
Prevail Torque: 36 Nm (M10 steel bolts)
Fixture Time: 10 minutes on steel, 5 minutes on brass, 15 minutes on stainless steel
Service Temperature Range: -55°C to +150°C
Specific Gravity: 1.1
Fluorescence: Yes, under UV light
Recommended for: Steel, stainless steel, brass, and plated surfaces
Packaging Sizes: 50 ml and 250 ml bottles
Primary Chemistry:
Methacrylate ester
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Loctite® 273 is a one-component, anaerobic adhesive formulated for the permanent locking and sealing of large 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® 273 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 150°C, ensuring long-term reliability in demanding environments.
Colour: Red
Viscosity: 400 to 600 mPa·s at 25°C
Breakaway Torque: 25 Nm (M10 steel bolts)
Prevail Torque: 36 Nm (M10 steel bolts)
Fixture Time: 10 minutes on steel, 5 minutes on brass, 15 minutes on stainless steel
Service Temperature Range: -55°C to +150°C
Specific Gravity: 1.1
Fluorescence: Yes, under UV light
Recommended for: Steel, stainless steel, brass, and plated surfaces
Packaging Sizes: 50 ml and 250 ml bottles
Primary Chemistry:
Methacrylate ester
Prevents loosening of large 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 large 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 150°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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