LOCTITE 242 Medium-Strength Threadlocker for M6–M36 Metal Fasteners
LOCTITE 242 Medium-Strength Threadlocker for M6–M36 Metal Fasteners
  1. LOCTITE 242 Medium-Strength Threadlocker for M6–M36 Metal Fasteners
  2. LOCTITE 242 Medium-Strength Threadlocker for M6–M36 Metal Fasteners

LOCTITE 242 Medium-Strength Threadlocker for M6–M36 Metal Fasteners

Loctite 242: Medium-Strength Threadlocker

1. Product Overview

Loctite 242 is a medium-strength threadlocker designed to secure threaded metal assemblies against loosening due to vibration. It is suitable for use on a wide range of metal threads, including stainless steel and plated surfaces, and performs exceptionally well even in slightly contaminated conditions (such as those with oils, cutting fluids, and lubricants).

2. Key Features

  • Medium Strength Locking
    Provides reliable medium-strength locking that ensures stability and prevents loosening of threaded connections.
  • Oil and Contamination Tolerance
    Effective even in the presence of light oil or contamination, making it ideal for various industrial and automotive applications.
  • Removable
    Allows for easy disassembly with standard tools, making it suitable for applications requiring periodic maintenance.
  • High Temperature and Chemical Resistance
    Performs well at temperatures up to 150°C (302°F) and resists a variety of chemicals, ensuring durability in harsh environments.
  • Prevents Leaks
    Seals gaps and prevents leakage of fluids, enhancing the reliability of connections in critical applications.

3. Product Specifications

  • Chemical Type: Methacrylate
  • Color: Blue
  • Viscosity: 900 – 1,500 mPa·s (cP)
  • Cure Time: Full cure in 24 hours
  • Maximum Thread Size: M36
  • Operating Temperature Range: -55°C to +150°C (-67°F to +302°F)
  • Shear Strength: 9.5 N/mm²
  • Breakaway Torque: 19 Nm (M10 bolts)
  • Prevail Torque: 7 Nm (M10 bolts)
  • Chemical Resistance: Excellent resistance to oils, lubricants, and industrial fluids

4. Applications

  • Machinery and Equipment Assembly
    Loctite 242 is ideal for securing machinery and equipment threaded connections, especially in high-vibration environments.
  • Automotive Industry
    Used extensively in automotive assembly and repair, including engine components and transmission systems.
  • Industrial Equipment
    Suitable for use in various industrial settings where reliability and resistance to vibration and contamination are critical.
  • Oil, Gas, and Chemical Industries
    Provides reliable sealing and locking in harsh environments, including applications with exposure to oils and chemicals.

5. How to Use

  1. Clean the Threads: Ensure threads are clean and dry. Lightly oil-contaminated surfaces can be used, but for best results, clean thoroughly.
  2. Apply the Adhesive: Evenly apply Loctite 242 to the threads.
  3. Assemble the Threads: Tighten the threads to ensure the adhesive covers all surfaces.
  4. Cure Time: Allow the adhesive to cure at room temperature for 24 hours.
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LOCTITE 242 Threadlocker is a blue, one-component anaerobic adhesive developed for locking and sealing threaded metal fasteners that require reliable vibration resistance and future disassembly with standard hand tools. Its medium-strength, medium-viscosity formulation cures when confined without air between close-fitting metal threads. The cured adhesive fills microscopic clearances within the assembly, helping prevent loosening, leakage, fretting and corrosion caused by shock, vibration and repeated mechanical loading.

LOCTITE 242 Threadlocker Benefits

LOCTITE 242 Threadlocker provides dependable medium-strength locking for general industrial fastening applications. Unlike mechanical lock washers and other traditional locking devices, the liquid adhesive fills the entire space between the male and female threads. This creates more uniform load distribution while helping protect the connection from moisture and contamination.

The one-component formulation requires no mixing, reducing preparation time and application errors. Its thixotropic consistency minimizes dripping and migration after dispensing, allowing operators to place the adhesive accurately on bolts, studs and threaded fittings. Positive fluorescence under ultraviolet light also supports production inspection and adhesive-coverage verification.

Once cured, the fastener normally remains removable with standard hand tools. This makes the product suitable for equipment that requires periodic servicing, adjustment or component replacement without the permanent retention associated with high-strength threadlockers.

Applications for LOCTITE 242 Threadlocker

LOCTITE 242 Threadlocker is suitable for metal fasteners up to approximately M36. Typical applications include electric motors, pumps, gearboxes, machine tools, compressors, conveyors, industrial equipment, automotive components and general maintenance assemblies.

Common uses include securing housing bolts, bearing-cover fasteners, mounting screws, gearbox bolts, pump fasteners, equipment-frame bolts and threaded components exposed to vibration. It can be used on steel, stainless steel, brass and selected plated metal surfaces after suitable preparation.

The product is especially useful where medium locking strength is required together with normal maintenance disassembly. Passive metals, plated surfaces, low temperatures and larger thread clearances may slow the anaerobic curing process. In these conditions, LOCTITE SF 7471 or LOCTITE SF 7649 Activator can be evaluated.

LOCTITE 242 Threadlocker Technical Properties

The uncured product is a blue dimethacrylate-ester liquid with a typical specific gravity of approximately 1.1 at 25°C. Henkel publishes a Brookfield viscosity range of approximately 800 to 1,600 mPa·s at 25°C, confirming its medium-viscosity, thixotropic processing profile.

The current official product information lists a fixture-time range of approximately 5 to 20 minutes, depending on the metal substrate and assembly conditions. After 24 hours of curing at 22°C, published breakaway torque on M10 black-oxide steel nuts and bolts is approximately 8 to 19 N·m.

Laboratory testing also demonstrates resistance to motor oil, gasoline, brake fluid, ethanol, acetone and water-glycol mixtures under specified exposure conditions. These figures are typical technical references rather than guaranteed purchasing specifications. Actual performance depends on metal activity, thread clearance, surface cleanliness, temperature, tightening torque and curing time.

How to Apply LOCTITE 242 Threadlocker

Clean the internal and external threads and remove oil, grease, dust, moisture and loose contamination. Allow the parts to dry completely. Shake the container before use and avoid touching the dispensing nozzle directly against metal surfaces.

For through-hole assemblies, apply several drops around the bolt where the nut will engage. For blind holes, dispense the adhesive into the lower internal threads so displaced air does not force the product out during assembly. Install and tighten the fastener to the specified torque before fixture strength develops.

For threaded sealing applications, apply a continuous 360-degree bead around the male threads while leaving the first thread free. Larger threads may require additional material on the female connection. Remove cured residue using a suitable solvent together with mechanical abrasion.

Why Choose LOCTITE 242 Threadlocker?

LOCTITE 242 Threadlocker combines medium-strength locking, controlled application, fast fixture development, chemical resistance and convenient maintenance disassembly. It is a practical general-purpose solution for manufacturers and maintenance teams seeking reliable protection against fastener loosening, leakage and corrosion.

Store unopened containers in a dry location, ideally between 8°C and 21°C. Review the official Henkel LOCTITE 242 Technical Data Sheet and current Safety Data Sheet before qualification or production use. Explore our medium-strength threadlockers for additional removable fastener-locking solutions.

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