Loctite 242 Blue Threadlocker 36 ml — Medium‑Strength Automotive Thread Lock, Removable for Service

LOCTITE 242 Automotive Blue Threadlocker is a medium-strength adhesive that secures metal fasteners against vibration while still allowing future disassembly with standard hand tools.

This 36 ml bottle of LOCTITE 242 was developed and lab-tested for automotive use and specified by OEMs for routine service applications. It bonds quickly, begins to set in about five minutes, and reaches full strength within 24 hours. Formulated to work on a wide range of metals — including stainless steel, aluminum, and plated surfaces — it helps keep nuts, bolts, and studs from loosening under vibration without permanently locking them in place.

How quickly will LOCTITE 242 hold my fasteners?

LOCTITE 242 provides a fast initial grab to reduce movement during assembly, with handling strength in minutes and a complete cure over time. That lets you assemble parts and continue work without long delays while ensuring the bond reaches designed strength within a day.

• Initial setting begins at approximately 5 minutes for many applications.
• Full cure is achieved in about 24 hours under typical conditions.
• Cure rate varies with substrate, gap size, and temperature.

Will it work on the metals used in my vehicle?

This formula is compatible with common automotive metals and plated finishes, making it suitable for most nuts and bolts found on engines, drivetrains, and chassis components. It bonds to passive surfaces such as stainless steel and aluminum where some adhesives struggle.

• Effective on stainless steel, aluminum, brass, and many plated surfaces.
• Engineered for threaded assemblies like valve covers and oil pans.
• Designed for use where repeated service or maintenance is expected.

How strong is "medium-strength" and can I remove parts later?

LOCTITE 242 is classified as medium-strength: strong enough to resist vibration-induced loosening but formulated so assemblies can be disassembled with common hand tools when maintenance is needed. It delivers a durable hold without the permanence of high-strength adhesives.

• Resists loosening from vibration while allowing removal with hand tools.
• Ideal for serviceable components like water pump and drive shaft bolts.
• Not intended for permanently fixed joints that require maximum shear strength.

Which automotive tasks is this best suited for?

LOCTITE 242 fits a wide range of repair and maintenance jobs where periodic access is required. It’s commonly used on fasteners that must remain secure during operation but still be removable for routine service.

• Valve cover bolts, oil pan bolts, and water pump fasteners.
• Drive shaft bolts, rocker arm nuts, and carburetor studs.
• General shop and field repairs across automotive and light industrial use.

Who is this for? Mechanics, DIY enthusiasts, fleet technicians, and maintenance professionals who need a reliable, manufacturer-grade threadlocker that balances secure holding power with serviceability will find LOCTITE 242 useful. The 36 ml size is convenient for shop drawers or service kits, and the product’s proven performance on a variety of metals makes it a practical choice for routine automotive repairs and other metal-thread applications where vibration resistance and future disassembly are required.