From Loctite: 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 (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. Operating temperature 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.
Specifications
| Brand | Loctite |
|---|---|
| Product | LOCTITE 638 |
| 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 mm - 0.25 mm |
| Key characteristics | Fluorescent; Oil tolerant; Strength: high strength; Temperature resistant; Viscosity: high viscosity |
| Operating temperature | -55.0 °C - 180.0 °C (-65.0 °F - 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) |
Sizes and Part Numbers
| Part Number (IDH) | Size | Sold As |
|---|---|---|
| 1835936 | 50 mL Bottle | Each |
| 1835937 | 10 mL | Case of 10 |
| 1835925 | 250 mL Bottle | Case of 10 |
| 1835924 | 1 L | Case of 4 |
LOCTITE 638 technical data sheet (PDF)
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