LOCTITE® 638 High Strength Retaining Compound
Features and Benefits
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
Documents and Downloads
There are no documents and downloads available for your location and language. You can try searching for a document in another language
Technical Information
Agency approvals / certificates / specifications | DVGW (EN 751-1): NG-5146AR0619, NSF P1 Reg. No 123010, WRAS (BS 6920): 0511518 |
Application method | Dispense system, Manual |
Applications | For close fitting cylindrical parts, For slip fitted parts, Retaining |
Color | Green |
Cure type | Anaerobic cure |
Fixture time | 4.0 min. |
Gap fill | 0.15 - 0.25 mm |
Key characteristics | Fluorescent, Oil tolerant, Strength: high strength, Temperature resistant, Viscosity: high viscosity |
Operating temperature | -55.0 - 180.0 °C (-65.0 - 355.0 °F ) |
Physical form | Liquid |
Recommended for use with | Metal: steel |
Shear strength, Steel | 31.0 N/mm² (4500.0 psi ) |
Viscosity | 2500.0 mPa·s (cP) |