We offer a comprehensive range of 243 Thread Sealing, which is formulated for the locking and sealing of threaded fasteners between 1/4" and 3/4" (6 to 20 mm). This tip pick Loctite® 243™ Primer less, Oil Tolerant Removable Medium Strength Blue Thread locker is capable of working on both active metals like brass, copper and also on passive substrates such as stainless steel and plated surfaces. A recommended replacement for Loctite 2440™, it has the property to tolerates minor surface contamination from various oils, such as cutting, lubrication, anti-corrosion and protection fluids.