LOCTITE® 221

Features and Benefits

Low strength, low viscosity threadlocking adhesive. Formulated for small metal threads up to M12.
LOCTITE® 221 is a methacrylate-based threadlocking adhesive designed for low strength applications on small threads up to a maximum size of M12. Typical fixture times are 25, 20 and 210 min on steel, brass and stainless steel respectively. Offering low viscosity and a breakaway torque of 8.5 Nm, the product is designed for fasteners that require easy disassembly with standard hand tools.
  • Low viscosity
  • Designed for small threads
  • Various pack sizes
  • Low strength
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Technical Information

Chemical basis / base Methacrylate
Color Purple
Fixture time 20.0 - 210.0 min.
Recommended for use with Metal: brass, Metal: steel, Metal: steel - stainless steel
Viscosity, Brookfield - RVT, @ 25.0 °C Spindle 1, speed 20 rpm 100.0 - 150.0 mPa·s (cP)