Loctite 242 Blue Threadlocker 36 ml — Medium-Strength Automotive Thread Lock, Vibration-Resistant

LOCTITE 242 Automotive Blue Threadlocker is a medium-strength, quick-setting adhesive engineered to lock and seal metal fasteners for reliable vibration resistance in automotive maintenance.

Built to the specifications of vehicle manufacturers and tested in professional labs, this 36 ml bottle of LOCTITE 242 delivers a proven solution for securing nuts, bolts, and studs on a wide range of metal substrates. It bonds to stainless steel, aluminum, plated surfaces and most other metals while allowing disassembly with hand tools when service is needed. The formula begins to set in about five minutes and develops full strength within 24 hours, making it practical for both quick repairs and long-term assemblies.

How quickly will LOCTITE 242 hold my fasteners?

LOCTITE 242 begins to set within approximately five minutes, giving you a usable hold soon after application. For maximum strength and full cure, allow up to 24 hours under normal conditions. Temperature and substrate porosity can affect cure speed, so plan service intervals accordingly.

• Initial set: ~5 minutes for handling
• Full cure: ~24 hours under standard lab conditions
• Faster cure at higher temperatures and slower in cold or inactive surfaces

Which materials and fastener types is this threadlocker best for?

This blue threadlocker is formulated for use on virtually all metals, including passive substrates like stainless steel and aluminum, and works well on plated parts. It’s designed for common automotive fasteners such as valve cover bolts, oil pan bolts, water pump bolts and drive shaft bolts while still allowing later disassembly.

• Compatible with stainless steel, aluminum, plated surfaces, and most ferrous metals
• Ideal for nuts, bolts, studs, and threaded assemblies in vehicles
• Suitable for components requiring routine servicing or periodic removal

Will it withstand vibration and everyday automotive conditions?

Formulated for automotive environments, LOCTITE 242 resists loosening caused by vibration and normal operational stresses. It creates a reliable bond that helps prevent fastener back-off without permanently locking parts, balancing durability with serviceability. For extreme or permanent applications, consider a higher-strength product instead.

• Resists vibration-induced loosening in engine and drivetrain areas
• Maintains performance across regular temperature and humidity ranges
• Medium strength keeps fasteners removable with standard tools

How should I apply and prepare parts for the best results?

For consistent performance, clean threads of oil, grease, and dirt before applying LOCTITE 242. Apply a small drop to the bolt or nut threads, assemble immediately, and tighten to the required torque. Allow cure time before subjecting the assembly to full load or vibration.

• Clean threads with solvent or degreaser for best adhesion
• Apply a single drop to the bolt threads; avoid over-application
• Tighten and allow 24 hours for full cure at room temperature

Who is this for? LOCTITE 242 is aimed at mechanics, restoration hobbyists, fleet maintenance teams, and DIYers who need a dependable, service-friendly threadlocker for automotive and light industrial work. If you require a medium-strength adhesive that secures threaded metal parts yet allows later disassembly with hand tools, this 36 ml formula fits routine maintenance, repair, and reassembly tasks where vibration resistance and manufacturer-level reliability matter.