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Anaerobic adhesives cure in the absence of air when confined between close-fitting metal parts. That single property makes them ideal for threads, bearings, and machined fits: the liquid stays workable while it is exposed to air, then hardens into a solid, gap-filling thermoset once the joint is assembled.
This collection covers anaerobic sealants for threaded pipe and fluid power connections, threadlockers that keep fasteners tight under vibration, and retaining compounds that secure cylindrical assemblies. Products are stocked in bottle sizes from 10ml to 350ml for bench, maintenance, and production use.
Perigee Direct carries Permabond anaerobic grades including LM012, LH056, LH150, and F201HV, covering hydraulic sealing, sprinkler systems with CPVC, general-purpose pipe sealing, and toughened high-impact applications. Our technical team can help you match viscosity, strength, and chemical compatibility to your assembly.
What is anaerobic adhesive is one of the most common questions we get. It is a single-part liquid that stays uncured while oxygen is present and polymerizes when air is excluded and active metal ions are in contact. Because no mixing is required and no solvent flashes off, the joint cures cleanly and completely inside the assembly.
In practice this means a product that can sit in an open bottle without setting, yet hardens in the thread within minutes of assembly. Active metals such as steel, brass, and copper speed the reaction; passive surfaces such as stainless steel, zinc, and anodized aluminum cure more slowly and may need an activator.
An anaerobic thread sealant seals tapered and parallel threaded connections against pressure, replacing tape and pipe dope. It fills the helical leak path completely, so it seals immediately on assembly and resists vibration loosening and thermal cycling.
A threadlocker is selected primarily for strength rather than sealing. Medium-strength grades allow removal with hand tools for serviceable assemblies; high-strength grades are for permanent fasteners that should not back out.
An anaerobic retaining compound bonds cylindrical parts such as bearings, bushings, sleeves, gears, and shafts into housings. It fills the clearance between the two machined surfaces, distributing load across the full engagement area rather than through a press fit or keyway alone.
Low-viscosity grades wick into tight clearances and pre-assembled parts. Medium viscosities suit general threaded assembly. High-viscosity and thixotropic grades stay put on large threads and vertical surfaces without running.
Check chemical compatibility before specifying. Sprinkler systems that include CPVC piping require a grade validated against environmental stress cracking of that plastic, and hydraulic and fluid power lines call for a sealant qualified for the pressures and fluids in service.
Common applications include sealing hydraulic and pneumatic fittings, sealing pipe threads in process and sprinkler systems, locking fasteners on pumps, motors, and gearboxes, and retaining bearings, bushings, and sleeves in housings during rebuilds.
Because the product cures inside the joint with no solvent loss and no mixing, it suits both production assembly and field maintenance. Single-part packaging also removes the mix-ratio errors that two-part systems are prone to when applied under time pressure.
Clean and dry both mating surfaces before application, and apply the adhesive to the engagement area rather than the leading threads so it is carried through the joint on assembly. Leave the assembly undisturbed while it fixtures.
Most medium-strength grades disassemble with standard hand tools. High-strength grades and retaining compounds usually require localized heat, typically around 450°F, to soften the cured adhesive before the parts will separate.
Anaerobic thread sealant grades seal metal pipe threads in hydraulic, pneumatic, and process lines, forming an instant pressure-tight seal that resists vibration and thermal cycling.
Threadlocking anaerobic adhesives prevent fasteners from loosening under vibration and shock, with medium-strength grades for serviceable joints and high-strength grades for permanent assemblies.
Anaerobic retaining compound products bond bearings, bushings, sleeves, and gears into housings and onto shafts, increasing load capacity and eliminating fretting in cylindrical fits.
Toughened grades such as Permabond F201HV add peel and impact resistance and adhere well to aluminum and copper, suiting assemblies that see shock loading rather than steady stress.
An anaerobic adhesive is a single-part liquid that cures when air is excluded and it contacts metal. Anaerobic adhesives stay liquid in the bottle and harden inside threads, bearing fits, and other close-fitting metal assemblies, with no mixing required.
Anaerobic sealants are used to seal threaded pipe and fluid connections against leaks in hydraulic, pneumatic, and process systems. They replace PTFE tape and pipe dope, sealing immediately on assembly and resisting vibration and pressure.
Most grades fixture in 10 to 30 minutes on active metals such as steel and brass, reaching full cure in about 24 hours. Passive metals such as stainless steel cure more slowly, and an activator will speed the reaction.
A threadlocker is chosen for locking strength against vibration, while an anaerobic thread sealant is chosen to seal the thread against pressure and leaks. Many sealant grades also provide some locking, and many threadlockers also seal, but each is optimized for its primary job.
Yes, though stainless steel is a passive surface and cures more slowly. Use an activator or select a grade formulated for passive metals to bring cure speed back to normal.
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