Loctite 566 Hydraulic Thread Sealant

LOCTITE® 566 Hydraulic Thread Sealant (50ml) is a low-strength brown thread sealant engineered for maximum efficacy in locking and sealing metal threaded pipes and fittings. This industrial-grade adhesive permanently seals and secures joints, preventing costly pressure leaks and fluid loss caused by shock, thermal expansion, or vibration. Whether you are securing hydraulic systems or pneumatic lines, this premium dimethacrylate ester acrylic liquid provides a robust, leak-proof seal on all metal threads—including passive materials and standard fittings.

Why Choose LOCTITE® 566?

• Anaerobic Curing Formula: Cures efficiently when confined in the absence of air between close-fitting metal surfaces to create a highly durable seal.
• Versatile Chemical Resistance: Formulated specifically to seal against water, oil, and most common organic materials used in industrial machinery.
• Medium Viscosity & Small Gap Optimization: Provides exceptional gap-filling capabilities, delivering peak performance with small clearances down to 0.05 mm.
• Vibration and Shock Protection: Prevents threaded components from loosening under severe industrial vibration or heavy operational stress.
• Low Strength for Maintenance Flexibility: Allows for effortless adjustments or component disassembly using standard hand tools without damaging delicate threads.

Technical Specifications

• Product Type: Anaerobic Threadlocking Adhesive / Sealant (Dimethacrylate Ester Acrylic)
• Strength: Low
• Color: Brown
• Container Size: 50ml
• Certifications: Manufactured to Henkel LMS standards (dated January-28, 2005) for certified consistency and quality control.

Simple Application Instructions

1. Clean: For optimal results, clean all internal and external surfaces with a LOCTITE® cleaning solvent and let dry completely. If curing speed is too slow or materials are inactive metals, pre-treat threads with Activator 7471™ or 7649™ and let dry.
2. Apply: Apply a sufficient amount of the liquid sealant to the threads to ensure complete coverage, paying attention to the target gap sizes.
3. Assemble: Assemble, thread, and wrench-tighten the fittings in accordance with manufacturer recommendations. The formula begins curing once confined between the mating metal surfaces.

Frequently Asked Questions (FAQ)

What is LOCTITE® 566 used for?

LOCTITE® 566 is a low-strength anaerobic thread sealant designed specifically for locking and sealing metal pipes, hydraulic fittings, and fine pneumatic components. It is formulated to prevent parts from losing pressure, leaking, or loosening due to shock, vibration, and fluid dynamics.

Can LOCTITE® 566 be disassembled?

Yes. LOCTITE® 566 is a low-strength formula, meaning joints can be easily broken down and serviced using standard industrial hand tools without requiring heat or specialized machinery.

Does LOCTITE® 566 work on non-metal surfaces?

No. LOCTITE® 566 relies on an anaerobic reaction that requires metal ions to cure. It is highly effective on metal materials but will not cure properly on plastics. For inactive metals, using a compatible LOCTITE® activator is highly recommended to speed up the process.

Is LOCTITE® 566 safe for extreme temperatures?

LOCTITE® 566 maintains reliable sealing integrity across an operational temperature range of -65°F to 300°F (-54°C to 149°C). For optimal shelf life before use, the unopened container should be stored in a dry location between 8°C and 21°C (46°F to 70°F).