Product details
| Grade | Loctite 290 |
| Strength | Medium to high strength |
| Colour | Green |
| 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 290 is for
The wicking grade, and the one that solves a problem the others cannot. At 20–55 mPa·s it is thin enough to travel into an already-assembled thread by capillary action — so a fastener that has been found loose can be locked in place without stripping the assembly down. The same penetration lets it seal porosity in welds, castings and powdered metal parts.
Key features
- Wicks into pre-assembled fasteners — no disassembly needed
- Very low viscosity: 20–55 mPa·s
- Medium to high strength — 30 N·m breakloose on M10
- Also seals porosity in welds, castings and powdered metal
- Tested to the lot requirements of Mil-S-46163A (a regional approval)
- Removable with standard hand tools in most cases
Typical applications
- Pre-assembled fasteners
- Sealing porous welds
Technical data
Uncured material
| Technology | Acrylic |
| Chemical type | Dimethacrylate ester |
| Appearance | Green liquid |
| Fluorescence | Positive under UV light |
| Components | One component — no mixing |
| Cure | Anaerobic; secondary cure by activator |
| Viscosity, Brookfield RVT 25°C | Spindle 1 at 50 rpm: 20–55 mPa·s |
| Specific gravity at 25°C | 1.08 |
| Viscosity class | Low — capillary action |
Torque and strength
M10 steel nuts and bolts, after 24 hours at 22°C.
| Breakaway torque (ISO 10964) | 10 N·m (90 lb·in) |
| Prevail torque (ISO 10964) | 29 N·m (260 lb·in) |
| Breakloose torque, pre-torqued to 5 N·m | 30 N·m (270 lb·in) |
| Max. prevail torque, pre-torqued to 5 N·m | 40 N·m (350 lb·in) |
| Compressive shear strength (ISO 10123) | ≥5.4 N/mm² (≥780 psi) |
Chemical resistance
Breakloose torque as a percentage of initial strength after ageing.
| Environment | °C | 100 h | 500 h | 1,000 h | 5,000 h |
|---|
| Motor oil (MIL-L-46152) | 125 | 85% | 85% | 50% | 50% |
| Leaded petrol | 22 | 90% | 90% | 90% | 90% |
| Brake fluid | 22 | 90% | 90% | 85% | 85% |
| Water / glycol 50:50 | 87 | 90% | 90% | 90% | 90% |
| Acetone | 22 | 85% | 85% | 85% | 85% |
| Ethanol | 22 | 80% | 80% | 80% | 80% |
Cured material
| Coefficient of thermal expansion (ISO 11359-2) | 80 × 10⁻⁶ K⁻¹ |
| Thermal conductivity (ISO 8302) | 0.1 W/(m·K) |
| Heat ageing data published to | 150°C |
How to use it
- For an already-assembled fastener: clean the threads, then apply several drops at the screw and body junction and let capillary action draw it in.
- For blind holes: apply several drops down the internal threads to the bottom of the hole.
- For porosity sealing: clean the area, heat it locally to about 121°C, let it cool to about 85°C, then apply.
- Do not let the bottle tip touch the metal surface.
- Remove with standard hand tools; where engagement is excessive, heat locally to about 250°C.
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.
When to reach for 290
290 is the only grade here that works on a joint you have already built. If a fastener is found loose on inspection and stripping the assembly is expensive, 290 wicks in and locks it. For new assembly work, choose by strength instead — 222 low, 243 medium, 270 or 263 high.
Always read the current technical and safety data before use —
ask us and we'll send it with your quotation.
