Loctite 243 Threadlocker (Medium Strength / Blue)

The undisputed global standard in threadlocking. Protect your machinery and assemblies against vibration, shock, and thermal expansion with the liquid power of Loctite 243.

Whether for industrial machinery, vehicles, or precision engineering, loose bolts and nuts can cause significant damage. Loctite 243 is the premier medium-strength liquid threadlocker that reliably secures threaded assemblies while simultaneously sealing completely against leakage and corrosion.

Why choose liquid Loctite 243?
Maximum thread filling: As a liquid, Loctite 243 flows perfectly between the threads. It completely fills all microscopic gaps, ensuring 100% mechanical locking and an airtight seal.

Medium strength (Blue): Provides highly reliable locking under heavy dynamic loads, yet allows for disassembly using standard hand tools for maintenance.
Improved temperature and oil tolerance: Performs perfectly on slightly contaminated surfaces (such as traces of cutting or engine oil) and withstands temperatures up to 180°C.
Suitable for all metals: Immediately effective on active metals (brass, copper) and passive materials (stainless steel, aluminum, galvanized steel) without the need for an activator.

Specifications & Applications
Ideal for: Flywheels, engine blocks, pumps, gearboxes, oil pans, and any other threaded assemblies subject to constant vibration or temperature fluctuations.