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.
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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)