Name: Loctite 638 Retaining Compound
SKU: 627
Availability: InStock

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Designed for bonding cylindrical fitting parts, particularly with narrow bond gaps up to 0.25mm (0.01″). Great for a fast cure on all metals, including passive substrates like stainless steel.

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 0.006″ to 0.01″ (0.15 mm to 0.25 mm). 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 -65°F to 355°F (-55°C to 180°C). 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
Hydrogen gas approval for sealing threaded metal fittings according to KIWA GASTEC QA AR 214