Fasto A339 - Retaining Adhesives
Features of A339
Fasto A339 - Retaining Adhesives
Features of A339

Fasto A339 – Super High Strength Anaerobic Retaining Compound

Fasto A339 – Heavy-Duty Retaining & Sealing Solution for Cylindrical Assemblies

Fasto A339 is a single-component, super fast curing, super high strength anaerobic retaining compound developed for retaining, sealing, and locking cylindrical metal components. It cures in the absence of air when confined between close-fitting metal surfaces, forming an exceptionally strong and durable bond.

Specially engineered to enhance press-fit and slip-fit assemblies, Fasto A339 provides excellent resistance to heat, vibration, and chemical exposure, making it ideal for power transmission and heavy-duty industrial applications.

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Key Features

  • Super High Retaining Strength
    Shear strength up to 34 N/mm² for critical load-bearing assemblies.
  • Anaerobic Cure Technology
    Cures only between metal parts, ensuring controlled and reliable bonding.
  • Fast Fixture Time
    Achieves handling strength in less than 6 minutes.
  • Excellent Heat Resistance
    Continuous service up to 175°C, intermittent exposure up to 210°C.
  • Gap Filling Capability
    Suitable for gaps up to 0.25 mm.
  • Corrosion Protection
    Prevents fretting and corrosion between mating metal parts.
  • Lubricating Effect During Assembly
    Allows smooth positioning of parts before curing.

Benefits

  • Permanently retains and locks cylindrical components
  • Increases load-carrying capacity of press-fit assemblies
  • Eliminates the need for mechanical fasteners or interference fits
  • Reduces loosening due to vibration and thermal cycling
  • Ensures long-term reliability in harsh industrial environments
Primary ApplicationSub-ApplicationsFunctional PurposeKey Performance Advantage
Cylindrical Part RetentionLocking sleeves, bushes, collarsPermanent retention of cylindrical componentsSuper high shear strength for critical assemblies
Bearing & Bushing RetainingBearings on shafts, bushings in housingsPrevent rotation, loosening & frettingAugments press-fit and slip-fit strength
Gear, Pulley & Sprocket RetentionGears, pulleys, sprockets on shaftsReliable torque transmissionExcellent vibration & shock resistance
Rotor & Shaft AssemblyMotor rotors, generator shaftsMaintain concentricity and load transferHigh strength with controlled gap filling (up to 0.25 mm)
Pump, Gearbox & Turbine AssembliesPumps, gearboxes, turbines, compressorsStructural retention under load & heatExcellent heat resistance and long-term durability
Industrial & Automotive AssembliesMotors, generators, mechanical drivesPrevent loosening and corrosionAnaerobic cure protects against corrosion
Thread Locking & Sealing (Secondary Use)Threads requiring very high strengthLock and seal threaded jointsExtremely high breakaway strength

Surface Preparation

  • Ensure parts are clean, dry, and free from oil, grease, dust, and contaminants.
  • Proper surface cleanliness is essential for maximum bond strength.

Application Method

  1. Apply Fasto A339 evenly to all engaged surfaces.
  2. Assemble parts immediately.
  3. Allow the joint to cure under anaerobic (air-excluded) conditions.
  4. Wipe off excess adhesive from the outside of the joint.

Curing Guidelines

  • Fixture time: < 6 minutes
  • Full cure: 8 hours
  • Maximum recommended gap: 0.25 mm

Additional Notes

  • Cure speed depends on temperature, bond gap, and substrate type.
  • On inert metals (stainless steel, zinc-plated parts) or at temperatures below 5°C, use Fasto AP49 Anaerobic Activator to accelerate cure (note: activator may reduce final strength by up to 30%).
  • Not recommended for certain plastics due to potential stress cracking.

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