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LOCTITE® 638
Features and Benefits
Designed for bonding cylindrical fitting parts, particularly with narrow bond gaps up to 0.25mm. 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 0.15 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
Documents and Downloads
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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) |
LOCTITE® 638
Designed for bonding cylindrical fitting parts, particularly with narrow bond gaps up to 0.25mm. Great for a fast cure on all metals, including passive substrates like stainless steel.