Loctite 243 (blue) thread locker 50ml

LOCTITE 243 is a medium strength blue threadlocking adhesive that seals and secures metal nuts and bolts to prevent loosening due to shock and vibration.
LOCTITE® 243 is a general purpose threadlocker that provides a medium strength bond. LOCTITE 243 works on all metals, including passive substrates such as stainless steel, aluminium and plated surfaces. It is proven to be tolerant of minor contamination due to industrial oils, e.g., motor oils, corrosion prevention oils and cutting fluid.
Prevents loosening on vibrating assemblies, e.g. pumps, gear boxes or presses
Works on all metals, including passive substrates (e.g. stainless steel, aluminium, plated surfaces)
Proven to tolerate minor contamination by industrial oils, e.g. engine oils, corrosion prevention oils and cutting fluids
Permits disassembly with hand tools for servicing
 
Generally speaking, the larger your thread, the higher the strength your threadlocker needs to be. For example:
Small thread – LOCTITE® 222 is suitable for small threads up to a maximum size of M12.
Medium thread – LOCTITE® 243 seals and secures fasteners with a maximum thread size of M18.
Large thread – LOCTITE® 263 can be used with applications that have a thread size up to M20.