Henkel LOCTITE 638 High-Strength Retaining Compound

Henkel LOCTITE 638 is a high-viscosity, green anaerobic adhesive specifically designed for the permanent bonding of cylindrical fitting parts. Firstly, this powerful retaining compound offers maximum strength on all metals, including passive substrates like stainless steel. Consequently, industrial engineers rely on this product to secure shafts, gears, and pulleys that are subject to extreme dynamic, axial, and radial loads.

Technical Performance and Chemical Properties

In addition to its high bonding strength, LOCTITE 638 features a high viscosity of 2,500.0 mPa·s. This thickness allows the liquid to fill diametrical gaps between 0.15 mm and 0.25 mm. Regarding its curing process, the adhesive offers an incredibly fast fixture time of only 4.0 minutes. Furthermore, its high-temperature resistance allows it to operate effectively in environments ranging from -55.0 °C to 180.0 °C. Therefore, this adhesive serves as an ideal solution for heavy-duty applications where thermal stability remains a critical factor.

Advanced Durability and Quality Control

Specifically, this retaining compound demonstrates excellent oil tolerance and can handle minor surface contaminants, such as industrial oils. Because the formula is fluorescent under UV light, quality control teams can easily inspect assemblies to confirm the presence of the adhesive. Moreover, the anaerobic cure technology ensures that the product hardens quickly when it is confined between metal surfaces. As a result, the LOCTITE 638 provides a shear strength on steel of 31.0 N/mm², which effectively prevents mechanical failure in high-stress joints.

Additionally, this product holds several global certifications, including NSF P1 and WRAS approvals. It even meets the performance requirements for use in hydrogen gas systems. Because it seals the entire joint, it also prevents fretting and corrosion within the assembly, ensuring a longer service life for your machinery.

Common Industrial Applications

Because of its superior rigidity and high-strength bond, Henkel LOCTITE 638 appears in many high-stakes sectors. For example, technicians frequently use it for slip-fitted parts, keyed assemblies, and high-performance threadlocking. Finally, the combination of high viscosity and fast fixture time ensures that your cylindrical parts remain secure under the most demanding conditions. This makes it a top-tier selection for any project that prioritizes mechanical security and maximum load resistance.