Loctite 277 High Strength Threadlocker 50ml
Available
Loctite 277 is a one-component, red, high strength anaerobic threadlocker (dimethacrylate ester). It is designed for the permanent locking and sealing of threaded fasteners.
Typical use: large bolts and studs (M25 and larger). It is a medium viscosity liquid of 6,000 to 8,000 mPa·s, and it fluoresces under UV light for inspection.
Where this product is used
- Permanent locking and sealing of large bolts and studs, M25 and larger
- Threaded fasteners that are not meant for routine removal
- Fasteners where the applied product is checked under UV light
- Assemblies where an activator is used as a secondary cure
Features
- High strength, for permanent locking and sealing
- Medium viscosity, not a high viscosity grade
- One component, no mixing
- Red liquid, fluorescence positive under UV light
- 32 N·m breakaway torque on M10 steel (24 h at 22 °C)
- Tested to the lot requirements of MIL-S-46163A (regional approval)
- Removable with localised heat to about 250 °C
Key specifications
| Specification | Detail |
|---|---|
| Brand | Loctite |
| Chemical type | Dimethacrylate ester (acrylic, anaerobic) |
| Colour | Red liquid, fluorescence positive under UV light |
| Strength class | High |
| Viscosity class | Medium |
| Viscosity (Brookfield RVT, 25 °C, spindle 4, 20rpm) | 6,000 to 8,000 mPa·s |
| Specific gravity (25 °C) | 1.12 |
| Breakaway torque (M10 steel nuts and bolts, 24 h at 22 °C, ISO 10964) | 32 N·m |
| Breakloose torque (M10, pre-torqued to 5 N·m) | 38 N·m |
| Prevail torque (M10 steel nuts and bolts, 24 h at 22 °C) | 32 N·m |
| Compressive shear strength (steel pins and collars, ISO 10123) | At least 9 N/mm² |
| Typical use | Large bolts and studs, M25 and larger |
| Approvals | Mil-S-46163A (tested to the lot requirements; this is a regional approval); ASTM D5363 (each lot produced in North America is tested to the requirements) |
| Storage | 8 °C to 21 °C, unopened, dry location |
Choosing the right option
The same grade is also sold in the 250ml pack: Loctite 277 High Strength Threadlocker 250ml.
For a lower strength grade see Loctite 243 Medium Strength Threadlocker; for other high strength grades see Loctite 263 High Strength Threadlocker, Loctite 271 High Strength Threadlocker 50ml and Loctite 272 High Strength - High Temperature Threadlocker 50ml.
See also: Loctite 277 High Strength Threadlocker 250ml, Loctite 272 High Strength - High Temperature Threadlocker 50ml, Loctite 263 High Strength Threadlocker, Loctite 271 High Strength Threadlocker 50ml.
Using it
Where an activator is needed, Loctite SF 7471 and SF 7649 are the secondary cure.
To disassemble, apply localised heat to the nut or bolt to approximately 250 °C and disassemble while hot.
Cure speed depends on the materials, the gap and the temperature.
Cold strength was tested to -75 °C, and it shows hot strength from -50 to 150 °C as a graph only.
Storage and handling
Store unopened in a dry location. Temperature range 8 °C to 21 °C as the optimal range. 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 oxidisers. Not normally recommended for plastics, as stress cracking can occur. Check compatibility with aqueous washing systems. Read the safety data sheet before use.
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