Loctite 243 Medium Strength Threadlocker 10ml
Available
Loctite 243 is a one-component, blue, medium strength anaerobic threadlocker. It locks and seals threaded fasteners that need normal disassembly with standard hand tools.
It cures between close-fitting metal surfaces, works on passive substrates such as stainless steel and plated surfaces, and tolerates minor oil contamination.
Where this product is used
- Locking nuts, bolts and studs that need normal disassembly
- Fasteners on passive surfaces such as stainless steel and plated parts
- Threads with minor oil contamination
- Small and large fasteners from M6 to M16 (breakaway data in the specification)
Features
- Medium strength, removable with standard hand tools
- Thixotropic liquid that stays where it is applied
- One component, no mixing
- Blue liquid with positive fluorescence under UV light, useful for inspection
- Tolerates minor oil contamination
- Anaerobic cure, with an activator as secondary cure
- Cold strength tested to -75 °C
Key specifications
| Specification | Detail |
|---|---|
| Brand | Loctite |
| Chemical type | Dimethacrylate ester |
| Colour | Blue, fluorescence positive under UV light |
| Viscosity (Brookfield RVT, 25 °C, spindle 3, 20rpm) | 1,300 to 3,000 mPa·s |
| Viscosity (cone and plate, 25 °C, cone 35/2, 129 s-1) | 350 mPa·s |
| Specific gravity | 1.08 at 25 °C |
| Breakaway torque (M10 black oxide bolts, mild steel nuts, 24 h at 23 °C, ISO 10964) | 22 N·m |
| Breakaway torque (M6 / M16, 24 h at 23 °C) | 9 N·m / 50 N·m |
| Prevail torque (M10 black oxide, mild steel nuts, 24 h at 23 °C) | 9 N·m |
| Compressive shear strength (ISO 10123, steel pins and collars) | Above 7.6 N/mm² |
| Cold strength | Tested to -75 °C |
| Storage | 8 °C to 21 °C, unopened, dry |
Choosing the right option
For a low strength grade on small fasteners see Loctite 222 Low Strength Threadlocker; for high strength see Loctite 263 High Strength Threadlocker. For another medium strength grade see Loctite 242 Threadlocker Anaerobic Adhesive Blue 50ml.
See also: Loctite 222 Low Strength Threadlocker, Loctite 263 High Strength Threadlocker, Loctite 242 Threadlocker Anaerobic Adhesive Blue 50ml, Loctite 290 Medium to High Strength Threadlocker.
| Option | Part number | SKU |
|---|---|---|
| 10ml | 243-10ML-LOC | A0049842 |
| 50ml | 243-50ML-LOC | A0049843 |
Using it
Shake the product thoroughly before use.
Cure speed depends on the materials, the gap and the temperature.
Where hand tools will not release the fastener, apply localised heat to about 250 °C and disassemble while hot.
Where they do not work, apply localised heat to approximately 250 °C.
Storage and handling
Store unopened in a dry location. Optimal storage is between 8 °C and 21 °C. Storage below 8 °C or above 28 °C can adversely affect the properties of the product.
Limits and safety
Not recommended for pure oxygen or oxygen-rich systems, or as a sealant for chlorine or other strong oxidising materials. Plastics can stress crack.
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10ml
Model Number: 243-10ML-LOC
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50ml
Model Number: 243-50ML-LOC
