Loctite 263
Loctite 263 High Strength Threadlocker and its variants are high-strength anaerobic threadlocking adhesives designed to permanently lock and seal threaded fasteners, preventing them from loosening due to shock, vibration, and machinery operation. They are red in color, cure in the absence of air between close-fitting metal threads, and generally require heat for disassembly.
Key Features
Main Features
High-strength permanent locking of bolts, nuts, studs, and threaded fasteners.
Anaerobic cure – hardens when confined between close-fitting metal surfaces with no air.
Primerless application – works on active and passive metals (steel, stainless, aluminum) without primer.
Oil tolerant – effective even on lightly oil-coated fasteners (“as-received”).
Heat-removable – while permanent, it can be disassembled with localized heat.
Fluorescent under UV for inspection.
Wide temperature range – performs from approx. -55 °C to +180 °C.
Applications
Heavy-Duty Mechanical & Industrial
- Studs in motor housings and engine blocks
- Fasteners in gearboxes, pumps, presses
- Bolts on heavy rotating machinery
Automotive & Powertrain
- Critical engine and drivetrain bolts
- Suspension and chassis fasteners
General Threadlocking
- Seals threads against vibration loosening and fluid/gas leakage
- Replaces mechanical locking devices like lock washers or pins
- Use on metal-to-metal threads (not recommended for plastics)
Product Data
| Typical Use | Works on steel, stainless steel and most plated fasteners. Tolerates thread lubrication, anti-corrosion and protection fluids. |
| Brand | Threadlocker |
| Chemical Composition | Dimethacrylate ester |
| Color | Red |
| Components | 1 part |
| Cure System | Anaerobic |
| Cure Time | Up to 72h depending on the substrate, the bondline gap, the temperature, and whether an activator is used. |
| Flash Point | 100 °C |
| Service Temperature | Up to 148.8 °C |
| Specific Gravity | 1.1 @ 25 °C |
| Viscosity | 400 to 600 |
Safety & Handling
Based on SDS guidance for Loctite 263 (varies by region – always check the SDS for your product):
Health Hazards
- May irritate eyes and skin; can cause allergic skin reaction.
- Exposure to vapors/mists may irritate respiratory tract.
Personal Protective Equipment (PPE)
- Wear gloves and eye protection (goggles/face shield).
- Use adequate ventilation.
- Avoid prolonged or repeated skin contact.
- Wash hands after handling.
First Aid
- Skin contact: Rinse with water and soap; seek medical advice if needed.
- Eye contact: Rinse thoroughly (≈10 min) and get medical attention.
- Inhalation: Move to fresh air; seek medical help if symptoms continue.
- Ingestion: Rinse mouth; do not induce vomiting; consult a doctor.
Fire Safety
- Product is non-flammable (flash point >100 °C).
- In a fire, toxic gases (oxides of carbon/nitrogen) can form; firefighters should wear full protective gear and breathing apparatus.
Storage & Spill
- Store in a cool, dry, ventilated place away from heat and sunlight.
- Avoid spills entering sewers/waterways; absorb leaks with inert material for disposal.
