LOCTITE 638 is a high strength, fast curing, general purpose retaining compound.
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. 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. 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
- Tolerates minor contaminants, including industrial oils
- DVGW Approval (EN 751-1): NG-5146AR0619