Loctite 660 is designed for the bonding of cylindrical fitting parts, particularly where bond gaps can approach 0.50 mm (0.02 Inch). The product cures when confined in the absence of air between close fitting metal surfaces and prevents loosening and leakage from shock and vibration. - This product possesses excellent gap cure characteristics. Typical applications include restoring correct fits on worn shafts, spun bearings and damaged keyways.