Product details
| Grade | Loctite 601 |
| Strength | High strength |
| Colour | Green |
| Family | Retaining compounds |
| 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 601 is for
The original low-viscosity retaining compound. At 100–150 mPa·s it is thin enough to travel into a close cylindrical fit by capillary action, bonding parts that are already almost touching. High strength at ≥15 N/mm², and it holds full strength in motor oil, petrol, brake fluid and ethanol out to 1,000 hours.
Key features
- Very low viscosity — 100–150 mPa·s, enters tight fits
- High strength: ≥15 N/mm² compressive shear
- 40–60 N·m breakloose torque on M10 pre-torqued fasteners
- Full strength retained in motor oil at 125°C, petrol, brake fluid and ethanol
- Cure graphs published on steel, aluminium and zinc dichromate
- Also usable as a high-strength threadlocker on fine threads
Typical applications
- Bearings on shafts
- Bushes in housings
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 20 rpm: 100–150 mPa·s |
| Viscosity, EN 12092 MV 25°C | 100–150 mPa·s at 277 s⁻¹ |
| Viscosity class | Low |
| Specific gravity at 25°C | 1.1 |
Strength and torque
After 24 hours at 22°C. Cure graphs cover gaps of 0.05, 0.15 and 0.2 mm.
| Compressive shear strength (ISO 10123) | ≥15 N/mm² (≥2,175 psi) |
| Breakaway torque, M10 black oxide steel | 15–40 N·m (130–350 lb·in) |
| Prevail torque, M10 black oxide steel | 25–50 N·m (220–440 lb·in) |
| Breakloose torque, pre-torqued to 5 N·m | 40–60 N·m (350–530 lb·in) |
| Max. prevail torque, pre-torqued to 5 N·m | 40–60 N·m (350–530 lb·in) |
Chemical resistance
As a percentage of initial strength after ageing.
| Environment | °C | 100 h | 500 h | 1,000 h |
|---|
| Motor oil (MIL-L-46152) | 125 | 100% | 100% | 100% |
| Unleaded petrol | 22 | 100% | 100% | 100% |
| Brake fluid | 22 | 100% | 100% | 100% |
| Ethanol | 22 | 100% | 100% | 100% |
| Acetone | 22 | 100% | 100% | 85% |
| Water / glycol 50:50 | 87 | 100% | 85% | 80% |
Cured material
| Coefficient of thermal expansion (ISO 11359-2) | 100 × 10⁻⁶ K⁻¹ |
| Thermal conductivity (ISO 8302) | 0.1 W/(m·K) |
| Specific heat | 0.3 kJ/(kg·K) |
| Heat ageing data published at | 120°C and 150°C |
How to use it
- Clean all surfaces, external and internal, with a Loctite cleaning solvent and allow to dry.
- On inactive metals, or where large gaps are present, use an activator and allow to dry.
- Slip fits: apply around the leading edge of the male part and the inside of the female part, and use a rotating motion during assembly to spread it.
- Press fits: apply thoroughly to both surfaces and assemble at high press-on rates.
- Shrink fits: coat to a smooth even film. Heating the female part — coat the male. Cooling the male part — coat the female. Doing both — apply to the cooled part, and avoid condensation on it.
- Shrink fits: coat the pin, then heat the collar to create enough clearance for free assembly.
- Do not disturb the parts until handling strength is reached.
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.
- Disassembly: hand tools first; if needed apply localised heat to about 250°C and take apart while hot. If that temperature is not possible, heat as far as you can and use mechanical aids.
- Store unopened and dry, ideally 8°C to 21°C; outside 8–28°C the properties can be affected.
- Do not return decanted product to the original container.
Loctite 601 or 603?
Both are low-viscosity high-strength grades at the same 100–150 mPa·s. 603 is the newer urethane methacrylate: it is stronger (≥22.5 against ≥15 N/mm²) and, importantly, it is formulated for surfaces that cannot be reliably cleaned. If the parts are properly degreased, 601 does the job. If there is any oil film left, specify 603. For gaps beyond a tight fit, step up to 648 or 638.
Always read the current technical and safety data before use —
ask us and we'll send it with your quotation.
