Product details
| Grade | Loctite 272 |
| Strength | High strength |
| Colour | Red |
| Family | Threadlockers |
| Brand | Loctite (Henkel) |
| Stock | Held in Dubai — buy one or bulk |
Pack sizes
Prices on request. Tell us the quantity you need.
Check stockWhat Loctite 272 is for
The high-temperature member of the family. Where the other high-strength grades publish data to 150°C, 272 is characterised at 200°C — and its compressive shear strength rises to ≥20 N/mm² after 72 hours at that temperature. For large bolts and studs M25 and above running hot: exhaust systems, turbochargers, furnace and boiler fittings.
Key features
- High strength and high temperature — data published to 200°C
- ≥14.5 N/mm² compressive shear at room temperature
- ≥20 N/mm² after 72 hours at 200°C, tested hot
- For large bolts and studs M25 and above
- Cures on as-received, phosphate-and-oil and zinc dichromate steel
- Heat needed for disassembly
Typical applications
- Exhaust fasteners
- Hot assemblies
Technical data
Uncured material
| Technology | Acrylic |
| Chemical type | Dimethacrylate ester |
| Appearance | Red-orange liquid |
| Fluorescence | Positive under UV light |
| Components | One component — no mixing |
| Cure | Anaerobic; secondary cure by activator |
| Viscosity, Brookfield RVT 25°C | Spindle 4 at 20 rpm: 4,000–15,000 mPa·s |
| Specific gravity at 25°C | 1.11 |
| Viscosity class | Medium |
Torque and strength
After 24 hours at 22°C unless stated.
| Breakaway torque, M10 steel | 23 N·m (200 lb·in) |
| Prevail torque, M10 steel | 25 N·m (220 lb·in) |
| Breakaway torque, 3/8 × 16 steel | ≥18 N·m (≥159 lb·in) |
| Compressive shear strength (ISO 10123) | ≥14.5 N/mm² (≥2,102 psi) |
| Compressive shear after 72 h at 200°C, tested at 200°C | ≥20 N/mm² (≥2,900 psi) |
Chemical resistance
Breakaway torque as a percentage of initial strength after 720 hours.
| Environment | °C | 720 h |
|---|
| Air reference | 87 | 100% |
| Processing temperature | 87 | 87% |
| Toluene | 87 | 80% |
| Phosphate ester | 87 | 70% |
| Motor oil (MIL-L-46152) | 87 | 62% |
| Petrol | 87 | 62% |
| Water | 87 | 58% |
Cured material
| Coefficient of thermal expansion (ISO 11359-2) | 80 × 10⁻⁶ K⁻¹ |
| Thermal conductivity (ISO 8302) | 0.1 W/(m·K) |
| Specific heat | 0.3 kJ/(kg·K) |
| Hot strength plotted to | 200°C |
How to use it
- Clean all threads, internal and external, with a Loctite cleaning solvent and allow to dry.
- Shake the bottle thoroughly before use.
- Do not let the nozzle touch metal — it makes the product cure in the tip.
- Thru holes: apply several drops onto the bolt at the nut engagement area.
- Blind holes: apply several drops down the internal threads to the bottom of the hole.
- Sealing: apply a 360° bead to the leading male threads, leaving the first thread free, and work it into the thread roots.
- Assemble and tighten to the specified torque within the fixture time.
Handling and storage
- Not recommended for pure oxygen or oxygen-rich systems.
- Not a sealant for chlorine or other strong oxidising materials.
- Not normally recommended on plastics — thermoplastics can stress-crack.
- On passive metals (stainless, aluminium, plated) or below 5°C, use Loctite SF 7471 or SF 7649 activator to bring the cure speed up.
- Store unopened and dry. Henkel gives optimal storage as 8°C to 21°C; outside 8–28°C the product properties can be affected.
- Do not return decanted product to the original container.
- Disassembly: apply localised heat to about 250°C and take the joint apart while hot — hand tools will not release a high-strength grade.
When 272 rather than 277?
Both suit large bolts and studs M25 and above. The deciding factor is heat: 277 is characterised to 150°C, while 272 is tested at 200°C and actually gains strength after heat ageing. If the joint runs hot — exhaust, turbo, furnace, boiler — specify 272. If it does not, 277 is the more general choice.
Always read the current technical and safety data before use —
ask us and we'll send it with your quotation.
