Loctite 638

For a retaining compound offering high-strength on all metals, including passive substrates, try LOCTITE® 638. You can expect high temperature performance and good oil tolerance, a fixture time of just four minutes, and gap fill of 0.15 mm to 0.25 mm (0.006'' to 0.01''). It even tolerates minor surface contaminants, including industrial oils. A high viscosity product, it’s ideal for shafts, gears, pulleys, and similar cylindrical parts, and can also be used for high-strength threadlocking and thread sealing applications. Operating temperature is-55°C to 180°C (-65°F to 355°F). LOCTITE 638 meets the performance requirements of KIWA GASTEC QA AR 214 for admixtures up to and including 100% hydrogen gas on metal threaded fittings – certifications are available in select countries.

•     Ideal for shafts, gears, pulleys and similar cylindrical parts
•     High-strength on all metals, including passive substrates (e.g. stainless steel)
•     High temperature resistance
•     Fluorescent under UV for quality control
•     KIWA GASTEC QA AR 214 certified for hydrogen gas systems