LOCTITE® 638 is designed for the bonding of cylindrical fitting parts, particularly with narrow bond gaps approaching 0.25 mm. The product cures when confined in the absence of air between close-fitting metal surfaces and prevents loosening and leakage due to shock and vibration. It not only works on active metals but also on passive substrates, exhibiting robust cure performance. The product offers high-temperature performance and good oil tolerance, and tolerates minor surface contaminants.

• Tolerates minor contaminants, including industrial oils
• High strength on all metals, including passive substrates (e.g. stainless steel)
• High temperature resistance
• Ideal for shafts, gears, pulleys and similar cylindrical parts
• DVGW Approval (EN 751-1): NG-5146AR0619
• P1 NSF Reg. No.: 123010
• WRAS Approval (BS 6920): 0511518

A retaining compound is an anaerobic adhesive that can secure bearings, bushes and cylindrical parts into housings or onto shafts. The compound is applied as a liquid and is used to fill in the inner spaces of components forming a 100% contact between mating metal surfaces. Once cured the retaining compound forms a strong precision assembly

A retaining compound helps to achieve maximum load transmission capability and uniform stress distribution. Micro movements between parts are eliminated to prevent component damage and fretting corrosion which reduces the need to purchase costly replacement parts

• Robust curing performance
• Works on active metals such as mild steel
• Works on passive substrates such as stainless steel and plated surfaces
• High temperature performance
• Tolerates minor surface contaminations from oils including cutting, lubrication, anti-corrosion and protection fluids

• Single component, quick and easy to apply

• Ideal for shafts, gears, pulleys and similar cylindrical parts

• DVGW Approval (EN 751-1): NG-5146AR0619

• WRAS Approval (BS 6920): 0511518

Loctite 638 retaining compound offers a high resistance to dynamic, axial and radial loads. This feature makes Loctite 638 ideal for bonding cylindrical fitting parts, shafts, gears, pulleys and locking bushing and sleeves into housings and onto shafts.