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
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.
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
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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