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LOCTITE 277 High Strength, Large Bolt Threadlocker

Features and Benefits

Available sizes:

Red, high strength, high viscosity methacrylate-based threadlocking adhesive, suited to large threads. Fluoresces to allow monitoring.
LOCTITE® 277 is a red, high strength, high viscosity, methacrylate-based threadlocking adhesive. It has a fixture time on steel of 30 min, brass 25 min and stainless steel 270 min making it deal for applications where migration of the adhesive must be prevented. Can tolerate slight contaminations of industrial oils. Suited to large threads. Fluoresces to allow monitoring.
  • High viscosity
  • Prevents unwanted movement, loosening, leaks and corrosion
  • Resists vibration
  • Breakaway torque on M10 bolts of 32 Nm
  • Suited to large threads
  • High strength
  • 6 ml / 36 ml sizes recommended for automotive aftermarket applications
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Documents and Downloads

Safety Data Sheets and RoHs
LOCTITE 277 Red Threadlocker 231089 en-US
IDH: 231089
EAN: 079340214347

Size Case: 10 ml Bottle

Quantity: 10.0/case

No documents found

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. )
Substrates Metal: Brass, Metal: Steel, Metal: Steel - Stainless Steel
Technology Acrylic
Viscosity, 20 RPM 7000.0 mPa·s (cP)

How to

Step by Step Guide

1. Preparation - Cleaning

It is recommended to use LOCTITE®­ 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 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.


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.


For the disassembly of corroded or seized parts, use LOCTITE® LB 8040™ Freeze and Release.

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Red, high strength, high viscosity methacrylate-based threadlocking adhesive, suited to large threads. Fluoresces to allow monitoring.

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    Frequently Asked Questions