Loctite retaining compounds loctite 234779 loctite 620 has been designed for the bonding of cylindrical fitting parts it cures in the absence of air when confined between close fitting metal surfaces and prevents loosening and leakage due to shock and vibration typical applications include locating pins in radiator assemblies sleeves in pump housings and bearings in auto transmissions loctite 620 is particularly suitable for applications where temperature resistance up to 200degc is re