Fasto A742 - Thread Sealants
Features of A742
Fasto A742 - Thread Sealants
Features of A742

Fasto A742 – Reliable Locking & Sealing for Hydraulic and Pneumatic Pipe Threads

Fasto A742 is a single-component, medium strength anaerobic pipe thread sealant designed to lock and seal fine to medium pitch metal pipe threads. It cures in the absence of air when confined between close-fitting metal surfaces, creating a vibration-resistant, leak-proof seal while still allowing controlled disassembly for servicing.

Fasto A742 provides an almost instant low-pressure seal and, once fully cured, can seal up to the bursting pressure of the pipe, making it ideal for hydraulic and pneumatic systems.

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Key Features

  • Medium Strength – Serviceable Joints
    Enables easier disassembly compared to high-strength sealants.
  • Anaerobic Cure Technology
    Cures only between metal threads; no surface curing.
  • Instant Low-Pressure Sealing
    Seals up to 2 bar within ~20 minutes.
  • High Final Pressure Resistance
    Seals up to the bursting pressure of the pipe (e.g., 10,000 psi when fully cured).
  • Thixotropic, Controlled Viscosity (~700 cPs)
    Prevents run-off and migration on vertical pipe joints.
  • Wide Temperature Resistance
    Continuous service from -50°C to +150°C.
  • Excellent Chemical & Solvent Resistance
    Resistant to oils, fuels, brake fluid, alcohols, acetone, and water.
  • Corrosion Protection
    Prevents fretting and corrosion on threaded pipe joints.

Benefits

  • Prevents leakage and vibration loosening in pipe systems
  • Ideal for hydraulic and pneumatic pipe threads
  • Allows maintenance-friendly disassembly
  • Improves system reliability and safety
  • Suitable for industrial and automotive fluid systems
Primary ApplicationSub-ApplicationsFunctional PurposeKey Performance Advantage
Hydraulic Pipe Thread SealingHydraulic fittings, pressure linesSeal and lock threaded jointsAlmost instant low-pressure seal; seals up to bursting pressure after full cure
Pneumatic System Pipe SealingPneumatic lines, air fittingsPrevent air leakage and vibration looseningMedium strength with reliable vibration resistance
Fine to Medium Pitch Pipe ThreadsPipe threads up to Ø 15 mmSecure sealing of close-fitting threadsOptimized viscosity for fine & medium pitch
Serviceable Pipe AssembliesJoints requiring maintenanceEnable disassembly and servicingMedium break & prevailing torque
Vibration-Exposed Pipe JointsPumps, compressors, machinery pipingPrevent loosening during operationAnaerobic locking and sealing combined
Oil & Solvent-Exposed Pipe SystemsOil, fuel, solvent handling linesMaintain seal integrity in harsh mediaExcellent chemical & solvent resistance
Industrial Fluid Transfer LinesProcess piping, utility systemsLong-term leak preventionPerforms up to high operating temperatures

Surface Preparation

  • Ensure threads are clean, dry, and free from oil, grease, and contaminants.
  • Proper cleaning is essential for optimum sealing and cure performance.

Application Method

  1. Apply Fasto A742 to all engaged pipe threads.
  2. Assemble the joint and tighten to the specified torque within 10 minutes of application.
  3. Allow the joint to cure under anaerobic (air-excluded) conditions.
  4. Wipe off excess sealant from the outside of the joint.

Curing Guidelines

  • Fixture time: 2–10 minutes
  • Low-pressure seal: up to 2 bar after ~20 minutes
  • Full cure: 12 hours
  • Maximum recommended gap: 0.15 mm

Additional Notes

  • Cure speed depends on temperature, substrate, and bond gap.
  • At temperatures below 5°C or on inert metals (e.g., stainless steel, aluminum), use Fasto AP49 / AP69 Activator to accelerate cure (note: activator may reduce final strength by up to 30%).
  • Not recommended for pure oxygen or chlorine systems.
  • Not suitable for certain plastics due to potential stress cracking—testing is recommended.

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