LOCTITE Threadlocker 243 5 ml Blue Medium Strength Anaerobic

LOCTITE 243 is a medium-strength, single-component anaerobic threadlocker designed for locking and sealing threaded fasteners. It cures in the absence of air between close-fitting metal surfaces, preventing loosening from vibration and leakage from shock. The blue liquid provides reliable performance on all types of bolts, including those with pre-applied oil. It is suitable for applications requiring disassembly with standard hand tools.

Advantages

Medium strength for easy disassembly with hand tools; oil-tolerant formulation allows application on slightly oily surfaces; fluorescent under UV light for easy inspection; temperature resistance from -55°C to +180°C; fast fixture time of 10 minutes on M10 steel; proven reliability from LOCTITE, the global leader in threadlocking technology.

Suitable for

• Locking and sealing bolts, nuts, and studs in automotive, industrial, and maintenance applications
• Fasteners requiring disassembly for service
• Applications where vibration resistance is critical
• Sealing threaded joints against leakage

Key specifications

• Product Type: Threadlocker
• Strength: Medium
• Color: Blue
• Volume: 5 ml
• Chemical Base: Methacrylate
• Cure Type: Anaerobic
• Fixture Time (M10 Steel): 10 minutes
• Full Cure Time: 24 hours
• Temperature Resistance: -55°C to +180°C (-65°F to +350°F)
• Max Thread Size: M36 (1.5 inches)
• Breakaway Torque (M10 Steel): 26 Nm (19 lb.in.)
• Prevail Torque (M10 Steel): 5 Nm (44 lb.in.)
• Viscosity: Medium
• Oil Tolerant: Yes
• Fluorescence: Yes (under UV light)
• Specific Gravity: 1.05
• Flash Point: >100°C (>212°F)
• Shelf Life: 24 months (unopened)

Recommendations

For best results, clean threads with LOCTITE SF 7063 cleaner and apply activator LOCTITE SF 7649 for inactive metals. Store in a cool, dry place. Use within 24 months of manufacture date.