LOCTITE 638 is designed for the bonding of cylindrical fitting parts, particularly where bond gaps can approach 0.25 mm. Features and Benefits: Cures when confined in the absence of air between close-fitting metal surfaces and prevents loosening and leakage due to shock and vibration Works on both active metals and passive substrates, exhibiting robust cure performance Offers high-temperature performance and good oil tolerance, and tolerates minor surface contaminants Typical Applications: Metal work