Loctite 638 Retaining Compound

Loctite 638 is designed for bonding cylindrical fitting parts, especially those with narrow bond gaps up to 0.25 mm. The product cures in the absence of air when confined between close-fitting metal surfaces, preventing loosening and leakage due to shock and vibration. It is effective on both active metals and passive substrates, providing reliable curing performance. Additionally, it offers high-temperature resistance, good oil tolerance, and can handle minor surface contaminants.

• High strength on all metals, including passive substrates
• High-temperature resistance
• Tolerates minor contaminants, including industrial oils
• Ideal for securing shafts, gears, pulleys, and similar cylindrical parts