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LOCTITE 638 Retaining Compound is a high-strength anaerobic adhesive specifically designed for bonding cylindrical components such as shafts, gears, pulleys, bearings, bushings, and sleeves. Its unique formula delivers exceptional performance on all metals, including passive substrates, making it ideal for assemblies requiring a durable and reliable bond under high stress. With excellent gap filling capability of 0.15 mm to 0.25 mm, it compensates for slight machining tolerances and surface irregularities, preventing loosening or leakage even under harsh conditions. The compound exhibits robust tolerance to minor contamination from industrial oils and offers impressive high-temperature performance, functioning effectively within the operating temperature range of -55°C to 180°C (-65°F to 355°F). LOCTITE 638 cures rapidly with a fixture time of approximately four minutes, optimizing assembly time while maintaining strong adhesion. Additionally, it meets the KIWA GASTEC QA AR 214 certification requirements for metal threaded fittings used in up to 100% hydrogen gas environments, underlining its reliability in critical industrial applications. Its versatility extends to high-strength threadlocking and thread sealing tasks, providing a multipurpose solution for automotive aftermarket, industrial repair, oil and gas, power generation, electric motor and fluid power industries. This retaining compound is essential for businesses seeking a high-performance adhesive for durable metal part assembly and maintenance.
Key Features
| Features | Description |
|---|---|
| High Strength Bonding | Provides strong and durable adhesion for cylindrical metal parts, enhancing assembly integrity. |
| Gap Filling Capability | Effectively fills gaps from 0.15 mm to 0.25 mm to accommodate machining variations. |
| Oil Contamination Tolerance | Maintains performance despite minor surface contaminants such as industrial oils. |
| High Temperature Resistance | Operates reliably between -55°C and 180°C, suitable for demanding thermal conditions. |
| Fast Fixture Time | Achieves fixture in approximately 4 minutes, enabling timely production processes. |
| Versatility on Metal Types | Suitable for all metals, including passive substrates and accommodates high-strength threadlocking and sealing. |
| Certification Compliance | Meets KIWA GASTEC QA AR 214 standards for 100% hydrogen gas metal threaded fitting applications. |
| Attributes | Description |
|---|---|
| Product Type | Retaining Compound (Anaerobic Adhesive) |
| Color | Typically amber or green (varies by batch) |
| Viscosity | High viscosity for superior gap filling |
| Fixture Time | Approx. 4 minutes (varies by substrate and conditions) |
| Cure Time | Depends on substrate and activators; full cure time may vary |
| Gap Fill | 0.15 mm to 0.25 mm (0.006" to 0.01") |
| Temperature Range | -55°C to 180°C (-65°F to 355°F) |
| Chemical Resistance | Tolerant to minor oil contamination; resistant to industrial solvents |
| Applications | Shafts, gears, pulleys, bearings, bushings, sleeves, threadlocking, thread sealing |
| Certification | KIWA GASTEC QA AR 214 for 100% hydrogen gas on metal threaded fittings (select countries) |
*Disclaimer: The above description has been AI-generated and has not been audited or verified for accuracy. It is recommended to verify product details independently before making any purchasing decisions.
LOCTITE 638 can fill gaps between 0.15 mm and 0.25 mm (0.006 inches to 0.01 inches) effectively, making it suitable for assemblies with minor machining tolerances.
Yes, LOCTITE 638 is formulated to bond strongly to all metals, including passive substrates, ensuring reliable adhesion even on metals that are typically challenging to bond.
Yes, LOCTITE 638 has good tolerance against minor surface contamination from industrial oils, maintaining performance without requiring extensive cleaning.
LOCTITE 638 meets KIWA GASTEC QA AR 214 certification requirements for use on metal threaded fittings with up to 100% hydrogen gas, available in select countries.
LOCTITE 638 works within a broad temperature range from -55°C to 180°C (-65°F to 355°F), making it suitable for high temperature industrial environments.
Yes, besides retaining cylindrical parts, LOCTITE 638 is versatile and can be applied for high-strength threadlocking and thread sealing to enhance assembly reliability.
LOCTITE 638 typically fixtures in about 4 minutes, although actual cure time may vary based on substrate material and the presence of activators.
Brand: loctite
Country Of Origin: India
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 a 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. Its operating temperature range 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
Automotive
Industrial maintenance and repair
Oil and gas
Power generation
Industrial manufacturing
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