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LOCTITE® 277
Features and Benefits
Designed for high-strength, permanent locking and sealing of large threads greater than 25 mm (1").
LOCTITE® 277 is a red, high strength, high-viscosity threadlocking adhesive especially suitable for large bolts and studs greater than 25.4 mm (1"). Fluoresces to allow monitoring. Disassembly with heat possible.
- High torque strength
- High viscosity
- Prevents unwanted movement, loosening, leaks and corrosion
- Can be disassembled by heating parts to 300°C (572°F)
- Meets Mil Spec: MIL-S-46163A Type I Grade L
Documents and Downloads
Looking for a TDS or SDS in another language?
Technical Information
| Application method | Dispense gun, Dispense system, Manual |
| Application temperature | -55.0 - 150.0 °C (-65.0 - 300.0 °F ) |
| Applications | Threadlocking for large bolts / studs |
| Breakaway torque, M10 Steel Nuts/Bolts | 32.0 N·m (280.0 in./lb. ) |
| Color | Red |
| Cure type | Anaerobic cure |
| Fixture time | 45.0 min. |
| Key characteristics | Fluorescent, Strength: high strength, Thixotropic |
| Physical form | Liquid |
| Prevail torque, M10 Steel Nuts/Bolts | 32.0 N·m (280.0 in./lb. ) |
| Recommended for use with | Metal: brass, Metal: steel, Metal: steel - stainless steel |
| Viscosity, 20 RPM | 7000.0 mPa·s (cP) |
How to
Step by Step Guide
1. Preparation - Cleaning
It is recommended to use LOCTITE® SF 7063, SF 7064 or SF 7070 to degrease and clean surfaces prior to applying threadlocker.
2. Preparation - Activation
If cure speed is too slow due to passive metals (stainless steel, aluminum and plated metals) or low temperature (below 5°C), use LOCTITE® SF 7240 or SF 7649 activator. Allow to dry.
3a. Application - Through Hole
Apply a few drops of liquid threadlocker to the thread engagement area. Assemble nut and tighten to proper torque.
3b. Application - Blind Hole
Apply several drops of liquid threadlocker into lower third of blind hole, as well as a few drops onto male threads, and then install male threads. Tighten to proper torque.
4. Assembly
Assemble and tighten to proper torque requirement. If several bolts are being assembled, torque them down to the correct value within the fixture time window.
5. Disassembly
If disassembly is not possible using normal hand tools, apply localized heat to approximately 500°F/260°C. Disassemble while hot with standard hand tools.
Equipment
For manual dispensing, the use of LOCTITE® EQ Pro Pump (for 50ml and 250ml bottles) or LOCTITE® Peristaltic Hand Pumps (50ml or 250ml versions) is recommended to ensure a consistent application volume.
Hint
For the disassembly of corroded or seized parts, use LOCTITE® LB 8040 Freeze and Release.
Frequently Asked Questions
What products can I use to prevent vibration loosening of parts? How do I prevent vibration loosening and leak paths?
What temperatures can threadlockers/thread sealants/gasketing materials work up to?
Are threadlockers/sealants/gasketing materials resistant to fluids such as gasoline, diesel, engine oil, water, glycol, acids, alkalis, hydraulic fluid, etc.?
Can threadlockers be used as thread sealants? Can thread sealants be used as threadlockers?
What health and safety (H&S) precautions do I need to take with this type of product?
LOCTITE® 277
Designed for high-strength, permanent locking and sealing of large threads greater than 25 mm (1").