LOCTITE® 661
Features and Benefits
A 1-part, high strength, low-viscosity retaining compound for bonding cylindrical fitting parts.
LOCTITE® 661 is a yellow/amber, high-strength retaining compound for bonding cylindrical fitting parts, particularly where strength at elevated temperatures is required. It's typically used for holding gears and sprockets onto gearbox shafts and rotors on electric motor shafts. This low-viscosity urethane methacrylate acrylic liquid cures when confined in the absence of air between close-fitting metal surfaces or when exposed to UV light of sufficient intensity. It’s designed to prevent loosening and leakage from shock and vibration.
- Anaerobic and UV light curing
- Secondary cure (activator) available
- High strength
- Low viscosity
- Service/operating temperature: -55°C to 175°C (-67°F to 347°F)
Documents and Downloads
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Technical Information
| Chemical basis / base | Methacrylate |
| Color | Amber |
| Diametrical clearance | <0.15 mm |
| Fixture time | 4.0 min. |
| Recommended for use with | Metal: steel |
| Shear strength | 15.0 N/mm² |
| Viscosity, Brookfield - RVT, @ 25.0 °C Spindle 2, speed 20 rpm | 400.0 - 600.0 mPa·s (cP) |
LOCTITE® 661
A 1-part, high strength, low-viscosity retaining compound for bonding cylindrical fitting parts.