Fasto A190 – Post-Assembly Wicking Threadlocker for Pre-Assembled Fasteners
Fasto A190 is a single-component, very low viscosity anaerobic threadlocking compound specially formulated with wicking capability. It is designed to penetrate and lock pre-assembled threaded fasteners where disassembly is not possible or where threadlocker could not be applied during assembly.
The adhesive cures in the absence of air when confined between close-fitting metal surfaces, delivering reliable locking, sealing, and corrosion protection.
Very Low Viscosity (≈10 cPs) Excellent capillary action for wicking into assembled threads.
Post-Assembly Application Ideal for already-assembled nuts, bolts, and screws.
Medium Strength Threadlocking Breakaway and prevailing torque up to 16 Nm (M10 steel fasteners).
Fast Fixture Time Handling strength achieved within 3–10 minutes.
Excellent Temperature Resistance Continuous service from -50°C to +175°C.
Good Chemical & Solvent Resistance Resists oils, fuels, brake fluid, water, alcohols, and solvents.
Dual Functionality Also suitable as a porosity sealant and for hairline cracks in cast components (pressure resistance up to 50 kg/cm²).
Benefits
Locks fasteners without disassembly
Prevents vibration-induced loosening
Seals threads against leakage and corrosion
Ideal for large assemblies with multiple fasteners
Enhances service reliability of assembled equipment
Primary Application
Sub-Applications
Functional Purpose
Key Performance Advantage
Post-Assembly Thread Locking
Pre-assembled screws, nuts & bolts
Secure fasteners after assembly
Very low viscosity with excellent wicking action
Wicking into Fine Threads
Fine to medium threaded fasteners
Lock threads without dismantling
Penetrates capillary gaps easily
Large Assembly Fastener Securing
Assemblies requiring alignment before locking
Locks multiple fasteners efficiently
Ideal where pre-application is not possible
Vibration & Shock Resistance for Threads
Fasteners exposed to dynamic loads
Prevent loosening during operation
Reliable anaerobic curing in confined joints
Porosity Sealing of Cast Components
Cast housings, porous metal parts
Seal micro-porosity & leaks
Sustains pressure in sealed components
Hairline Crack Sealing
Micro cracks in metal castings
Prevent fluid leakage
Low viscosity penetrates fine defects
Leak Prevention in Threaded Joints
Threaded joints exposed to oils & fluids
Seal threads against leakage
Anaerobic cure fills micro-gaps
Surface Preparation
Ensure parts are clean, dry, and free from grease or oil.
Cleaning is critical to ensure effective wicking and curing.
Application Method
Apply Fasto A190 to the engaged thread area.
Allow the adhesive to wick into the threads by capillary action.
Leave the assembly undisturbed while curing occurs.
Wipe off excess adhesive from outside the joint if required.
Curing Guidelines
Fixture time: 3–10 minutes
Full cure: 12 hours
Maximum recommended gap: 0.15 mm
Additional Notes
Cure speed depends on temperature, substrate type, and bond gap.
On inert metals (stainless steel, aluminium) 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 possible stress cracking.
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