PS Corporation

Loctite 640 is a high-strength, high-temperature anaerobic adhesive designed for bonding cylindrical fitting parts, particularly where maximum strength is required. 
1. High Strength: It provides a strong bond between cylindrical fitting parts, ideal for applications where there are high loads or where a permanent assembly is desired.
2. Anaerobic Adhesive: Loctite 640 cures in the absence of air (anaerobic conditions) when confined between close-fitting metal surfaces, such as between shafts and hubs, threads, or bushings.
3. Temperature Resistance: It offers good resistance to heat and can withstand temperatures up to 180°C (356°F) once cured, making it suitable for applications where thermal stability is crucial.
4. Gap Filling: Loctite 640 can fill larger gaps (up to 0.25 mm) between mating surfaces, helping to improve the bond strength even in less-than-perfect fitting parts.
5. Sealing Properties: In addition to bonding, it provides a seal against leakage of gases and liquids, enhancing the reliability of the assembly.
6. Applications: Common uses include securing bearings in housings, locking sleeves on shafts, and securing cylindrical assemblies in automotive, industrial, and manufacturing applications where strong, reliable bonding is necessary.

LOCTITE® 640 is a green, anaerobic, low viscosity, methacrylate ester-based retaining compound ideal for parts requiring a longer positioning time. Fixturing time on steel is 2 h. Also used for active metals such as brass. This is a high strength product with good temperature resistance. Max. diametrical clearance is 0.1 mm and service temperature is -55 to +175ºC. Fluorescence allows product presence to be monitored.

• 1-part product, requires no mixing
• Slow curing
• Ideal for large diameter components
• High strength
• Also for active metals such as brass
• Good temperature resistance.