LOCTITE® 221
Features and Benefits
This 1-part, low strength, low-viscosity threadlocking adhesive is formulated for small thread sizes up to M12.
LOCTITE® 221 is a purple, low strength, 1-part low-viscosity liquid threadlocker ideal for locking small diameter screws and long engagement length fasteners. It prevents small screws from loosening due to shock and vibration, while still allowing for easy disassembly at room temperature without shearing the screw. For use on all metal fasteners up to M12, including steel, brass and stainless steel.
- Suitable for steel, stainless steel and brass
- Designed for small thread sizes
- Low strength
- Low viscosity
- Low viscosity
Documents and Downloads
Looking for a TDS or SDS in another language?
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) |
LOCTITE® 221
This 1-part, low strength, low-viscosity threadlocking adhesive is formulated for small thread sizes up to M12.