Loctite retaining compounds loctite 1804041 loctite 648 is designed for the bonding of cylindrical fitting parts and is ideal for the retention of parts with a small clearance or interference fit it cures when confined in the absence of air between close fitting metal surfaces and prevents loosening and leakage due to shock and vibration loctite 648 exhibits a robust curing performance works on passive substrates as well as offering high temperature performance and good oil tolerance lo