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Anaerobic adhesives are single-part industrial adhesives that cure when air is excluded between close-fitting metal surfaces. This makes them especially useful for thread sealing, threadlocking, and retaining cylindrical components such as bearings, bushings, sleeves, gears, and shafts.
This collection includes anaerobic thread sealants for hydraulic, pneumatic, pipe, and fluid power connections, threadlockers for fasteners exposed to vibration and shock, and retaining compounds for machined cylindrical fits. Available grades cover different viscosities, strengths, gap sizes, and service requirements, with bottle sizes suited to maintenance, repair, and production environments.
Choose from Permabond anaerobic products including LM012, LH056, LH150, F201HV, and other formulations for applications ranging from general-purpose sealing to high-impact industrial assemblies.
An anaerobic adhesive is a single-part liquid adhesive that remains uncured while exposed to air but begins to polymerize when confined between close-fitting metal surfaces.
This curing mechanism makes anaerobic products particularly useful for threaded and cylindrical assemblies. The adhesive stays workable during application, then hardens inside the assembled joint to form a solid, gap-filling thermoset.
Because anaerobic adhesives are supplied as single-part products, they require no resin-to-hardener mixing and do not rely on solvent evaporation to cure.
Active metals such as steel, brass, and copper generally promote faster curing. Passive surfaces including stainless steel, zinc-plated materials, and anodized aluminum may cure more slowly and can require an appropriate activator depending on the product and application.
Anaerobic thread sealants are designed to seal threaded metal connections against leakage.
The liquid fills the small spiral leak paths that remain between mating threads and cures after assembly, helping create a durable seal that can withstand vibration, pressure, and temperature cycling.
Common applications include:
Unlike thread sealing tape or conventional pipe compounds, an anaerobic sealant fills the available clearance between the mating threads and remains contained within the assembled joint.
For specialized systems, always consider material and fluid compatibility. Applications involving CPVC, hydraulic fluids, chemicals, or elevated pressure may require a specific approved or compatible grade.
Anaerobic threadlockers help prevent threaded fasteners from loosening under vibration, shock, and repeated thermal movement.
They cure between mating metal threads and fill the clearance between the fastener and threaded hole or nut.
Threadlockers are generally selected according to the strength required:
Medium-strength threadlockers are intended for assemblies that need to stay secure during operation but may need to be disassembled later with standard hand tools.
High-strength threadlockers are used where a more permanent connection is required and loosening during service must be minimized.
Typical applications include bolts, studs, screws, and other threaded fasteners used on pumps, motors, gearboxes, production machinery, and industrial equipment.
Anaerobic retaining compounds are formulated for cylindrical assemblies rather than threaded fasteners.
They are commonly used to secure:
The retaining compound fills the clearance between mating cylindrical surfaces and distributes load across the bonded area.
This can help increase the effective strength of the assembly while reducing movement, fretting, and wear between fitted parts.
Retaining compounds can be useful during both original assembly and equipment rebuilding, particularly where a worn housing or fit needs additional support.
Some anaerobic adhesives are formulated with additional toughness to improve resistance to shock, impact, peel, and dynamic loading.
Grades such as Permabond F201HV are designed for demanding assemblies where components may experience sudden loads rather than steady static forces.
Toughened anaerobic formulations can also be useful when bonding metals such as aluminum and copper or where increased impact resistance is important.
Selecting the right product depends on several factors, including:
The first step is determining whether the application requires sealing, threadlocking, or retaining.
From there, viscosity, strength, and compatibility can be matched to the joint.
Viscosity affects how easily an anaerobic adhesive flows into the assembly.
Low-viscosity formulations can penetrate tight clearances and may be useful for closely fitted or pre-assembled components.
Medium-viscosity products are commonly used for general threaded assemblies and applications where controlled flow is required.
High-viscosity or thixotropic grades resist running and stay in place more effectively on larger threads, wider gaps, and vertical surfaces.
The correct viscosity helps ensure that enough adhesive remains within the engagement area to form a reliable cured joint.
Metal type can affect anaerobic adhesive cure speed and performance.
Active metals such as carbon steel, brass, and copper generally support rapid curing, while passive or treated surfaces may require additional time or the use of an activator.
Chemical compatibility is also important.
For example, sealants used in hydraulic and fluid power systems should be compatible with the fluids, pressures, and temperatures encountered in service. Sprinkler systems incorporating CPVC components may require a grade specifically evaluated for compatibility with that material.
Always review the requirements of the specific system before selecting an anaerobic product.
Anaerobic adhesives are widely used in manufacturing, maintenance, repair, and equipment rebuilding.
Typical applications include:
Their single-part format also makes anaerobic products convenient for field maintenance because there is no mix ratio to measure before application.
For consistent results, begin with clean and dry mating surfaces. Remove oil, grease, dirt, cutting fluids, and other contaminants that may interfere with the bond.
Apply the product to the area where the surfaces will engage rather than only to the leading edge of the thread or component. This helps distribute adhesive throughout the joint as the parts are assembled.
After assembly, tighten or position the components as required and leave the joint undisturbed while the adhesive reaches fixture strength.
Passive metals or unusually slow-curing conditions may require an activator according to the product instructions.
Disassembly depends on the strength and type of anaerobic adhesive used.
Medium-strength threadlockers are generally designed to allow removal using standard hand tools.
High-strength threadlockers and retaining compounds can require localized heat to soften the cured adhesive before disassembly. Some products may require temperatures around 450°F, but the correct removal procedure should always be confirmed from the technical data for the specific adhesive and surrounding components.
By matching the product type, viscosity, strength, substrate compatibility, and service conditions to the application, anaerobic adhesives can provide reliable sealing, locking, and retaining performance across a wide range of industrial assemblies.
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