Fasto A350 - Retaining Adhesives

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 Application Sub-Applications Functional Purpose Key Performance Advantage
Cylindrical Part Retention Locking sleeves, bushes, collars Permanent retention of cylindrical components Super high shear strength for critical fits
Bearing & Bushing Retaining Bearings on shafts, bushings in housings Prevent rotation, loosening & fretting Augments press-fit & slip-fit assemblies
Gear, Pulley & Sprocket Retention Gears, pulleys, sprockets mounted on shafts Reliable torque transmission Excellent resistance to vibration & shock
Rotor & Shaft Assembly Motor rotors, generator shafts Maintain concentricity and load transfer Fast curing with high early strength
Pump, Gearbox & Turbine Assemblies Pumps, gearboxes, turbines, compressors Structural retention under load & heat Excellent heat resistance and durability
Industrial & Automotive Assemblies Motors, generators, mechanical drives Prevent loosening and corrosion Anaerobic cure protects against corrosion
Thread Locking & Sealing (Secondary Use) Threads requiring very high strength Lock and seal threaded joints Extremely 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.

To access Technical & Safety Documents, please submit your details.

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