| Chemical Basis/Base | Methacrylate | 
| Color | Purple | 
| Fixture Time | 20 ~ 210 Minutes | 
| Suitable For | Metal, Brass, Steel, Stainless Steel | 
| Typical Use | Up to M12 (½" Bolts) | 
| Strength | Low Stength | 
| Viscosity | 100 ~ 150 mPa·s (cP) Brookfield | 
| Product Type | Industrial Adhesives, Threadlocker | 
| Technology Names | Acrylates, Anaerobic Cure | 
LOCTITE® 221 THREADLOCKER 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 8.5Nm, the product is designed for fasteners that require easy disassembly with standard hand tools.