Loctite 680 retaining compound is a high strength, high viscosity room temperature curing adhesive used to join fitted cylindrical parts. It fixtures in 10 min and provides a shear strength of 4000 psi. Capable of filling diametral gaps up to 0.015 Inch (0.38 mm). - Loctite 680 is designed for the bonding of cylindrical fitting parts, particularly where low viscosity is required. The product cures when confined in the absence of air between close fitting metal surfaces and prevents loosening and leakage from shock and vibration.