Fasto Lockseal - Thread Lockers

Fasto LockSeal – High Strength Locking & Sealing for Heavy-Duty Fasteners

Fasto LockSeal MV is a medium to high strength anaerobic threadlocker and sealant designed for locking and sealing threaded metal assemblies. It cures in the absence of air when confined between close-fitting metal surfaces, forming a strong, vibration-resistant bond that prevents loosening, leakage, and corrosion.

Its slightly oil-tolerant formulation allows bonding of lightly oily “as-received” parts, while delivering best performance on clean substrates. LockSeal MV is ideal where high strength opening is required, yet controlled disassembly remains possible with standard tools.

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Key Features

  • Medium-High Strength Threadlocking
    Breakaway torque up to 28 Nm and prevailing torque up to 25 Nm (M10 steel fasteners).
  • Anaerobic Cure Technology
    Cures only between metal threads—no surface curing.
  • Slight Oil Tolerance
    Bonds lightly oily parts; optimal strength on clean surfaces.
  • Fast Fixture Time
    Handling strength achieved in approximately 6 minutes.
  • Wide Operating Temperature Range
    -50°C to +150°C continuous service.
  • Excellent Chemical & Solvent Resistance
    Resistant to motor oil, petrol, brake fluid, alcohols, acetone, and water.
  • Corrosion Protection
    Prevents rust and fretting of assembled fasteners.
  • Green Colour
    Easy visual identification during application and inspection.

Benefits

  • Prevents vibration-induced loosening and thread leakage
  • Improves reliability of industrial and automotive assemblies
  • Reduces maintenance and re-tightening
  • Protects fasteners from corrosion and environmental attack
  • Suitable for fine to medium-coarse metric and imperial threads
Primary Application Sub-Applications Functional Purpose Key Performance Advantage
High-Strength Thread Locking & Sealing Metric & imperial nuts, bolts & studs Prevent loosening and leakage simultaneously High breakaway & prevailing torque
Hydraulic & Fluid System Sealing Hydraulic fittings, threaded fluid joints Lock threads and seal against fluid leakage Anaerobic sealing fills micro-gaps
Heavy Machinery Fasteners Crushers, diesel generators, heavy engineering equipment Maintain joint integrity under load & vibration Excellent vibration & shock resistance
Agricultural & Construction Equipment Mounting bolts, housing screws Secure fasteners in harsh environments Slight oil tolerance, reliable curing
Automotive & Industrial Assemblies Chassis fasteners, industrial bolt joints Long-term fastening & sealing Prevents corrosion of assembled parts
Leak Prevention in Threaded Joints Joints exposed to oils & solvents Seal threads against seepage Chemical & solvent resistance
Corrosion Protection of Threads Outdoor & industrial fasteners Extend service life of fasteners Seals threads from moisture ingress

Surface Preparation

  • Ensure threaded parts are clean, dry, and free from grease or heavy oil.
  • While slightly oil tolerant, clean substrates ensure maximum strength.

Application Method

  1. Apply Fasto LockSeal MV to all engaged threads.
  2. Assemble and tighten the fastener as required.
  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: 12 hours
  • Maximum recommended gap: 0.10 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 cure (note: activator may reduce final strength by up to 30%).
  • Not recommended for pure oxygen or chlorine systems.

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