Loctite Blue Thread Locker 242 (0.5 ml) - 24205 is a medium-strength thread locker designed to seal and lock threaded fasteners to prevent loosening due to vibration. It is designed for use on fasteners up to 1 (25 mm) in diameter and is certified to NSF/ANSI Standard 61 for use in potable water systems. It is also resistant to oil, water, and most shop fluids.