LOCTITE 242

Harmonization Code : 3506.10.00.00 | Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg

LOCTITE 242

Main features

  • Medium-Strength Thread Retention
  • Vibration-Resistant Fastener Threadlocking
  • Thread Sealing Protection

Product Description

LOCTITE® Threadlocker Blue 242® is a medium-strength anaerobic threadlocking adhesive designed for locking and sealing threaded metal fasteners that may require normal disassembly using standard hand tools. The adhesive cures in the absence of air between close-fitting metal surfaces to prevent loosening caused by shock and vibration while helping protect threads against rust and corrosion. LOCTITE 242 is particularly effective on less active metals, including stainless steel and plated surfaces, and is commonly used in automotive, maintenance, industrial, and household fastening applications. Once cured, it forms a durable, moisture-resistant bond capable of withstanding service temperatures from -54°C to 149°C.

Key features

  • Medium-strength threadlocking: Secures threaded fasteners while allowing removal with standard hand tools.
  • Vibration resistance: Helps prevent fastener loosening caused by shock and vibration.
  • Thread sealing protection: Seals threads and helps protect against rust and corrosion.

Applications / Suitable for

  • Automotive fasteners including valve covers, water pumps, alternators, and oil pans.
  • Maintenance applications involving light machinery, conveyors, door hardware, and tow motors.
  • Household equipment such as lawn mowers, grills, bicycles, and locksets.
  • Threaded metal fasteners from 6 mm to 19 mm in diameter.
Product Family

LOCTITE 242

Loading pricing…
TDS, SDS & Technical Documents

Technical Specifications

General Properties
Appearance
Appearance at room temperature.
Liquid
Color
The color
Blue
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
1.1
Physical Properties
Viscosity
Viscosity is a measurement of a fluid’s resistance to flow. Viscosity is commonly measured in centiPoise (cP). One cP is defined as the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP. A product like honey would have a much higher viscosity -around 10,000 cPs- compared to water. As a result, honey would flow much slower out of a tipped glass than water would. The viscosity of a material can be decreased with an increase in temperature in order to better suit an application
800 - 1600 mPa.s
Thermal Properties
Flash Point
The flashpoint of a solvent is the lowest possible temperature at which it can vaporize to form an ignitable vapor. Flashpoint is often confused with “autoignition temperature”, which is the temperature at which a solvent ignites without an ignition source.
>100 °C

Additional Information

Technical Properties

As-supplied / Before-processing Properties

Property Value Unit Method / Condition
Color Blue — Uncured material
Appearance Liquid — As supplied
Chemical Base Dimethacrylate ester — Anaerobic adhesive
Viscosity 800 - 1,600 cP Typical value
Specific Gravity 1.10 — Typical value
Flash Point >100 °C Typical value
Fixture Time 10 minutes Active metals (steel)
Full Cure Time 24 hours Typical cure
Shelf Life 24 months Unopened container
Technical Properties

After-processing / Final-state Properties

Property Value Unit Method / Condition
Service Temperature Range -54 to 149 °C Cured material
Breakaway Torque 7.9 - 17 N·m Steel nuts and bolts, 24 h cure
Prevail Torque 1.7 - 6.8 N·m Steel nuts and bolts, 1 h cure
Moisture Resistance Yes — Cured material
Cured Form Hard solid — Non-flammable
Motor Oil Resistance 100 % strength retained 1,000 h @ 125°C
Brake Fluid Resistance 100 % strength retained 1,000 h @ 22°C
Ethanol Resistance 95 % strength retained 1,000 h @ 22°C

Leading Brands Trust in Our Products and Services

Products that Perform| Knowledge that Serves| Service that Delivers