Loctite 609 Retaining Compound Retaining Strength When you're installing two cylindrical fitting parts together, you'll want to use a retaining compound. The Loctite 609 Retaining Compound is a high-strength retaining compound designed for the bonding of cylindrical fitting parts. It cures to create a tighter fit between two metal surfaces. Features Prevents loosening and provides a tighter fit Perfect for pressfit bearings | Loctite | 609 Retaining Compound . 34 Fl Oz