Loctite 221 Threadlocking Adhesive 250ml

LOCTITE 221 is a low strength, low viscosity threadlocking adhesive. The product is dimethacrylate-based and purple in colour. LOCTITE 221 is designed for the locking and sealing of fasteners which require easy disassembly with standard hand tools. Suitable for small threads, up to a size of M12.

LOCTITE 221 cures in the absence of air between close-fitting metal surfaces. It prevents loosening and leakage from shock and vibration. Typical applications include adjustment of set screws and small diameter or long engagement length fasteners.

• Low strength
• Low viscosity
• Suitable for small threads, maximum size M12
• Fixture time is 25 min on steel, 20 min on brass, 210 min on stainless steel
• Working temperature ranges from -55°C to 150°C
• Breakaway torque of 8.5 Nm

How to use Loctite 221:

1. For best results, clean all surfaces with a solvent. Allow it to dry.
2. If using on inactive metal or curing speed is too slow, use an activator spray such as LOCTITE SF 7471 or SF 7649. Allow it to dry.
3. Shake before use. Do not allow the tip to touch the surfaces during application. This will prevent the liquid from clogging in the nozzle.
4. For thru holes. Apply several drops of the product onto the bolt at the nut engagement area.
5. For blind holes. Apply several drops of the product down the internal threads to the bottom of the hole.
6. For sealing applications. Apply a 360° bead of product to the leading threads of the male fitting. Leave the first thread free. For bigger threads: adjust product amount accordingly. Apply product on the female threads also.
7. Assemble and tighten as required.

Storage

Store LOCTITE 221 in the unopened container in a dry location. Optimal Storage: 8° C to 21° C. Storage below 8° C or greater than 28° C can adversely affect product properties.