LOCTITE® 272 is a one-component, red, high-strength anaerobic threadlocker for permanently locking and sealing close-fitting metal fasteners. It cures after assembly when air is excluded between metal surfaces, helping prevent loosening and leakage caused by shock and vibration. Its high-temperature capability makes it well suited to large bolts and studs, with M25 (1 in.) and larger fasteners listed as typical applications.
Key benefits
- High-strength, permanent-grade threadlocking for demanding assemblies
- Service temperature after full cure: -65°F to 450°F (-54°C to 232°C)
- Helps resist loosening and leakage from shock and vibration
- Seals threaded joints and supports through-hole applications
- Medium-viscosity, thixotropic formula for controlled application
- One-component product; no mixing required
Available sizes and manufacturer IDs
| Size | Package | Henkel IDH | Calculated net-content weight |
|---|---|---|---|
| 36 mL | Bottle | 492143 | 39.96 g |
| 50 mL | Bottle | 88442 | 55.5 g |
| 250 mL | Bottle | 195542 | 277.5 g |
Weight note: Henkel does not publish packaged shipping weights for these variants. The weights above are calculated net-content weights using the official specific gravity of 1.11 at 25°C (volume × density). They are not measured packaged shipping weights.
Technical specifications
| Brand / manufacturer | LOCTITE® / Henkel Corporation |
|---|---|
| Product type | High-strength anaerobic threadlocker |
| Technology | Acrylic; dimethacrylate ester chemistry |
| Components | One component; no mixing |
| Appearance | Red to red-orange liquid |
| Viscosity | Medium; 4,000 to 15,000 mPa·s (cP), Brookfield RVT at 25°C |
| Specific gravity | 1.11 at 25°C |
| Cure | Anaerobic; activator can be used as a secondary cure aid |
| Fixture time | 40 minutes (typical; substrate and temperature affect cure speed) |
| Breakaway torque | 23 N·m (200 lb·in) on M10 steel nuts and bolts after 24 hours at 22°C |
| Prevail torque | 25 N·m (220 lb·in) on M10 steel nuts and bolts after 24 hours at 22°C |
| Compressive shear strength | At least 14.5 N/mm² (2,102 psi) on steel pins and collars after 24 hours at 22°C |
| Recommended materials | Close-fitting metal surfaces, especially steel |
Technical values are typical manufacturer data and can vary with substrate, gap, temperature, activator use, and cure conditions.
Popular applications
- Permanent locking and sealing of large metal bolts and studs
- High-temperature threaded assemblies
- Fasteners exposed to shock, vibration, or leak paths
- Through-hole and blind-hole threaded assemblies
- Automotive powertrain and chassis, electric-motor, heavy-equipment, and industrial maintenance work
Directions for use
- Clean: Remove oil and contamination from internal and external threads with a suitable LOCTITE® cleaner, then allow the parts to dry.
- Activate when needed: On inactive metals such as stainless steel, aluminum, or plated surfaces—or when cure is slow at temperatures below 5°C (41°F)—apply LOCTITE® SF 7471 or SF 7649 and let it dry.
- Protect the nozzle: Do not let the dispensing tip touch metal; contact can cure product in the nozzle.
- Through holes: Place several drops on the bolt where the nut will engage.
- Blind holes: Apply several drops down the internal threads toward the bottom of the hole and add several drops to the bolt.
- Thread sealing: Apply a continuous 360° bead to the leading male threads while leaving the first thread free. Work material into larger threads or gaps; coat female threads as needed.
- Assemble: Join and tighten the parts to the specified torque before the adhesive fixtures.
Disassembly: Try standard hand tools first. If the assembly cannot be removed, heat the nut or bolt locally to about 250°C (482°F) and disassemble while hot.
Cleanup: Cured material can be softened with a LOCTITE® solvent such as LOCTITE® 7200, then removed with a soft scraper. Avoid generating dust or aerosols. Finish with a suitable LOCTITE® cleaner such as 7063.
Storage
Keep the unopened container closed and dry in a cool, well-ventilated location. Henkel lists 8°C to 21°C (46°F to 70°F) as the optimal range; storage below 8°C or above 28°C (82°F) can affect product properties. The U.S. SDS specifies safe storage at or below 38°C (100.4°F), away from heat, sparks, and open flame. Keep locked up. Do not return dispensed material to the original container because contamination can reduce product performance.
Safety and use limitations
WARNING: Causes skin irritation. May cause an allergic skin reaction. Causes serious eye irritation. Suspected of causing cancer. May cause organ damage through prolonged or repeated exposure.
- Read and understand all safety precautions before use. Avoid breathing vapor, mist, or spray.
- Use with adequate ventilation. Wear protective gloves and clothing plus eye and face protection. Wash thoroughly after handling.
- Not recommended for pure-oxygen or oxygen-rich systems, or as a sealant for chlorine or other strong oxidizers.
- Not normally recommended for plastics, particularly thermoplastics that can stress-crack. Confirm compatibility before use.
- The current U.S. SDS identifies the formulation as UN 3082, Class 9, Packing Group III for ground, air, and water transport; actual shipment requirements can depend on package and shipment conditions.
California Proposition 65: Cancer and Reproductive Harm — www.P65Warnings.ca.gov.
Consult the current Safety Data Sheet for complete first-aid, spill, exposure-control, disposal, and transport information.
Official LOCTITE® 272 Technical Data Sheet
Henkel product page and safety documents