Loctite 638 – High-Strength Retaining Compound

Loctite 638 is a high-strength, fast-curing retaining adhesive designed for bonding cylindrical metal parts with close tolerances. It provides excellent gap-filling capability and strong resistance to vibration, shock, and thermal expansion. Ideal for heavy-duty industrial and automotive applications, Loctite 638 ensures permanent, reliable assembly of components.

Key Features

• High Strength: Strong retention for press-fit and slip-fit assemblies

• Gap Filling: Suitable for parts with slight clearance between metal components

• Fast Curing: Quickly achieves handling strength once confined

• Vibration & Shock Resistant: Prevents loosening under dynamic loads

• Corrosion Protection: Seals threads and gaps to prevent rust and fretting

• Temperature Resistant: Performs reliably across a wide operating temperature range

• Oil-Tolerant: Works effectively on slightly oily or contaminated surfaces

Typical Applications

• Bonding bearings, bushings, sleeves, and gears

• Securing rotors, pulleys, and shafts

• Industrial machinery and automotive assemblies

• Heavy-duty applications requiring permanent, high-strength retention