Fasto A350 - Retaining Adhesives
Features of A350
Fasto A350 - Retaining Adhesives
Features of A350

Fasto A350 – Heavy-Duty Retaining & Sealing Compound for Cylindrical Assemblies

Fasto A350 is a single-component, super-fast curing, super high-strength anaerobic retaining compound designed for permanent retaining, locking, and sealing of cylindrical metal parts. It cures in the absence of air when confined between close-fitting metal surfaces, forming an exceptionally strong and durable bond.

Engineered to enhance press-fit and slip-fit assemblies, Fasto A350 provides excellent resistance to heat, vibration, and chemicals, making it ideal for industrial and automotive power-transmission applications.

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Key Features

  • Super High Retaining Strength
    Shear strength up to 34 N/mm² for load-bearing assemblies.
  • Anaerobic Cure Technology
    Controlled curing only between metal surfaces.
  • 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 assembled parts.
  • Lubricating Effect During Assembly
    Allows smooth part positioning before cure.

Benefits

  • Permanently retains and locks cylindrical components
  • Increases load-carrying capacity of press-fit assemblies
  • Eliminates the need for mechanical fasteners
  • Reduces loosening caused by vibration and thermal cycling
  • Ensures long-term reliability in harsh environments
Primary ApplicationSub-ApplicationsFunctional PurposeKey Performance Advantage
Cylindrical Part RetentionLocking sleeves, bushes, collarsPermanent retention of cylindrical componentsSuper high shear strength for critical fits
Bearing & Bushing RetainingBearings on shafts, bushings in housingsPrevent rotation, loosening & frettingAugments press-fit & slip-fit assemblies
Gear, Pulley & Sprocket RetentionGears, pulleys, sprockets mounted on shaftsReliable torque transmissionExcellent resistance to vibration & shock
Rotor & Shaft AssemblyMotor rotors, generator shaftsMaintain concentricity and load transferFast curing with high early strength
Pump, Gearbox & Turbine AssembliesPumps, gearboxes, turbines, compressorsStructural retention under load & heatExcellent heat resistance and 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 all parts are clean, dry, and free from oil, grease, and contaminants.
  • Proper surface cleanliness is essential for maximum bond strength.

Application Method

  1. Apply Fasto A350 evenly to all engaged areas.
  2. Assemble the 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: 10 hours
  • Maximum recommended gap: 0.25 mm

Additional Notes

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

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