Loctite 638 Retaining Compound
Available
Maximum room-temperature strength for cylindrical fitting parts. High viscosity fills bond gaps up to 0.25 mm. Cures on active and passive metals, rated from -55°C to +180°C. Loctite 638 is a green anaerobic retaining compound for locking bushes, sleeves and bearings into housings and onto shafts. It tolerates light oil contamination and fixtures in about 4 minutes. To disassemble, heat locally to about 250°C and pull apart while hot.
Product: Loctite 638 Retaining Compound. Size: 50 ml. Technology: acrylic. Chemical type: urethane methacrylate. Appearance: green liquid, fluorescent under UV light. Cure: anaerobic; activator as secondary cure. Viscosity (Brookfield RVT, 25°C): 2,500 mPa·s. Gap fill: 0.15 mm to 0.25 mm. Fixture time: 4 minutes. Compressive shear strength (steel pins and collars, 72 h): 29 N/mm². Operating temperature: -55°C to +180°C. Approvals: DVGW (EN 751-1) NG-5146AR0619; WRAS (BS 6920) 0511518; NSF P1. Hydrogen: conforms to KIWA GASTEC QA AR 214. Storage: 8°C to 21°C, dry. Consult the Safety Data Sheet before use.
At a glance
| Type | High Strength Retaining Compound |
|---|---|
| Cure | Anaerobic |
| Viscosity | 2,500 mPa·s |
| Temperature Range | -55°C to +180°C |
| Gap Fill | 0.15 to 0.25 mm |
- Bushes and sleeves — locking into housings and onto shafts
- Bearings — retaining in housings with gaps up to 0.25 mm
- Gears, pulleys and rotors — bonding onto shafts
- Stainless steel and plated assemblies — cures on passive surfaces
Full specifications, applications, features and important limits are in the tabs below.
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