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Retaining compounds reliably secure bearings, keyways and cylindrical parts into housings or onto shafts. LOCTITE® retaining compounds offer an effective and economical method to eliminate challenges such as loosening, corrosion, backlash and wearing by providing uniform stress distribution and unitizing the assembly.
LOCTITE retaining compounds are available in many different compositions and strengths to cater to a wide range of industrial applications. These different retaining compounds cover a wide variety of tolerances and applications for plant maintenance and assembly needs.
Failure of cylindrical assemblies can lead to major unplanned downtime and decreased product reliability. Many traditional retaining methods have shortcomings that lead to their failure. Pins & keyway assemblies have an uneven distribution of mass, an imbalance that can lead to vibration at high speeds. Splines and serrations cause high stresses due to the “notch effect”. Press and shrink fits rely on friction alone to transmit torque, requiring close tolerances. Most of these traditional methods involve high production costs.
LOCTITE retaining compounds offer a reliable and cost-effective method to secure bearings, bushes, and cylindrical parts into housings or onto shafts. Because LOCTITE Retaining Compounds are applied as liquid, they fill the entire space between two close-fitting cylindrical surfaces and harden into a tough thermoset plastic, resulting in a unitized assembly. LOCTITE Retaining Compounds increase the maximum load transmission capability of the assembly and eliminate fretting corrosion and expensive machining.
Typically, lower viscosity retaining compounds are used for gaps up to 0.006 in. These retaining compounds are used in interference fits like those found in press fits.
LOCTITE 609 is a green, high strength methacrylate ester acrylic retaining compound designed for the bonding of cylindrical fitting parts. The product cures in the absence of air between close fitting metal surfaces. Typical applications include rotor to shafts in fractional and sub fractional horsepower motors. Locks bushings and sleeves in housings on shafts.
For gaps above 0.006 in. retaining compounds with higher viscosities that allow for better gap fill are used. These include bonded slip fits or clearance fits.
LOCTITE 638 is designed for the bonding of cylindrical fitting parts, particularly with narrow bond gaps approaching 0.25 mm. The product cures when confined in the absence of air between close-fitting metal surfaces and prevents loosening and leakage due to shock and vibration. It not only works on active metals but also on passive substrates, exhibiting robust cure performance. The product offers high-temperature performance and good oil tolerance, and tolerates minor surface contaminants.
For assemblies with large gaps greater than 0.020 in. that are badly worn, special paste-like retaining compounds should be used.
LOCTITE 660 is a high strength retaining compound with good gap filling properties, ideal for repairing worn-out seats, keys, splines, bearings or tapers without remaining.
