Fasto A333 – Super High Strength Anaerobic Retaining Compound
Fasto A333 is a single-component, super-fast curing, super high-strength anaerobic retaining compound designed for permanent locking, retaining, and sealing of cylindrical metal assemblies. It cures in the absence of air when confined between close-fitting metal surfaces, delivering exceptional strength, thermal resistance, and long-term reliability.
Fasto A333 is specially formulated to augment press-fit and slip-fit assemblies, making it ideal for power transmission components where mechanical load and vibration resistance are critical.
Super High Retaining Strength Shear strength up to 40 N/mm² for heavy-duty assemblies.
Anaerobic Cure Mechanism Cures only in confined metal joints, preventing premature curing.
Fast Fixture Time Achieves handling strength in less than 5 minutes.
Excellent Heat Resistance Continuous service up to 175°C and 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 easy part positioning before cure.
Benefits
Permanently locks and retains cylindrical components
Enhances load-bearing capacity of press-fit assemblies
Eliminates the need for mechanical locking methods
Reduces vibration-induced loosening
Ensures long service life in demanding industrial environments
Primary Application
Sub-Applications
Functional Purpose
Key Performance Advantage
Cylindrical Part Retention
Sleeves, bushes, collars
Permanent retention of cylindrical components
Super high shear strength for power transmission
Bearing & Bushing Retaining
Bearings on shafts, bushings in housings
Prevent movement and fretting
Augments press-fit & slip-fit strength
Gear, Pulley & Sprocket Retention
Gears, pulleys, sprockets on shafts
Secure torque transmission
Excellent resistance to vibration & shock
Rotor & Shaft Assembly
Motor rotors, generator shafts
Maintain concentricity and load transfer
High strength with controlled gap fill (up to 0.25 mm)
Pump, Gearbox & Turbine Assemblies
Pumps, gearboxes, turbines, compressors
Structural retention under load & heat
High temperature resistance with long-term durability
Industrial & Automotive Assemblies
Motors, generators, mechanical drives
Prevent loosening and corrosion
Anaerobic cure protects against corrosion
High-Strength Thread Locking (Secondary Use)
Threads requiring very high strength
Lock and seal threads permanently
Extremely high breakaway strength
Surface Preparation
Ensure parts are clean, dry, and free from oil, grease, and contaminants.
Cleaning is critical to achieve maximum strength and reliable curing.
Application Method
Apply Fasto A333 evenly to all engaged areas of the assembly.
Assemble parts immediately.
Allow the joint to cure under anaerobic conditions.
Wipe off any excess adhesive from the outside of the joint.
Curing Guidelines
Fixture time: < 5 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 Activator to accelerate cure (note: activator may reduce final strength by up to 30%).
Not recommended for certain plastics due to possible stress cracking.
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