LOCTITE® 576 is a brown, medium viscosity, low strength thread sealant designed to lock and seal metal threaded fittings that require routine disassembly using standard hand tools. Featuring low odour and dimethacrylate-ester chemistry, it cures in confined spaces to prevent loosening and leakage caused by shock or vibration.
Appearance (uncured): brown liquid
Viscosity: medium, ~4 000–6 000 mPa·s (Brookfield RVT)
Specific gravity: ~1.08 g/mL
Chemical type: dimethacrylate ester
Cure: anaerobic (air exclusion) with optional activator
Strength: low (allows disassembly)
Maximum gap: ~0.2 mm
Breakaway torque (M10): ~2–8 N·m; Prevail torque: ~1–6 N·m
Flash point: >100 °C
Hazard statements: H319, H335, H412 (eye irritation, respiratory irritation, aquatic toxicity)
Primary Chemistry:
Dimethacrylate ester
Conor Robertson, Technical Specialist
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Fast answers to formulation and application questions.
LOCTITE® 576 is a single component thread sealant that stabilises and seals threaded connections in metal components. It cures anaerobically within close-fitting threads, helping maintain reliable seals while allowing disassembly. Suitable for applications involving standard maintenance and servicing, it offers a clean and effective thread locking solution without risk of over tightening or damage.
Prevents fasteners from loosening due to vibration or mechanical shock
Controls leaks without needing PTFE tape or pipe dope
Enables easy maintenance by allowing manual disassembly
Ensures a clean, precise application every time
Apply a 360° bead to the male threads before assembly and torque to specification
Suitable for steel and typical metal fittings; use activator for faster cure or less active substrates
Allow at least 24 hours for full cure under typical conditions; disassembly can be achieved using hand tools or by heating to ~250 °C if required
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