
LOCTITE® 660 Retaining Compound 50ml
LOCTITE® 660 Quick Metal is a high-viscosity, high-strength anaerobic retaining compound specifically formulated for repairing and restoring cylindrical fitting assemblies that have developed excess clearance due to wear. If you need to salvage worn bearing seats, keys, splines, or tapers without the time and expense of custom re-machining, Loctite 660 is the ultimate metal fixative gel.
As a single-component, thixotropic paste, it won't run or migrate after application. It cures reliably in the absence of air between close-fitting metal surfaces, creating a solid, high-shear bond that completely seals assemblies against shock, vibration, and fluid leakage.
Key Features & Benefits
- Exceptional Gap Filling: Specially engineered to fill diametrical clearance gaps up to 0.5 mm (0.02 inches).
- Cost-Saving Salvage Tool: Enables immediate re-use of spun bearings, scored shafts, and damaged keyways without requiring mechanical sleeving or welding.
- Thixotropic Metallic Paste: Non-running formula stays exactly where you apply it, making it ideal for overhead or vertical applications.
- Industrial Resistance: Offers maximum resistance to harsh chemical solvents, motor oil, unleaded gasoline, and brake fluids.
- Certified Quality: Registered to NSF Category P1 for safe use as a sealant in and around food processing areas (where there is no direct food contact).
Technical Specifications
| Property | Specification |
| Brand / Manufacturer | Henkel Loctite |
| Product Type | Retaining Compound (Quick Metal) |
| Container Size | 50ml Tube |
| Color | Silver / Metallic Gray |
| Maximum Gap Fill | 0.5 mm (0.02 in) |
| Shear Strength (Steel) | 3,335 psi ($23\text{ N/mm}^2$) |
| Fixture Time | 15 minutes (at room temperature) |
| Full Cure Time | 24 hours (varies by substrate and gap size) |
| Operating Temperature | -55°C to +150°C (-65°F to +300°F) |
| Viscosity Range | 250,000 to 1,500,000 mPa·s (High/Paste) |
| Approved Substrates |
Steel and other metal |

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