LOCTITE® 221 Low-Strength Threadlocker 50ml

Ensure your small-diameter fasteners stay secure without the risk of shearing during future maintenance. LOCTITE® 221 is a premium, low-strength threadlocker engineered specifically for small threads (up to M12).

Why Choose LOCTITE® 221?

This methacrylate-based threadlocking adhesive is the industry standard for applications requiring controlled strength and ease of disassembly.

• Low Strength: Designed for easy removal without damaging delicate hardware.
• Precision Performance: Ideal for small-diameter screws and long engagement lengths.
• Vibration Resistant: Prevents loosening caused by mechanical shock and vibration.
• Versatile Compatibility: Effective on brass, steel, and stainless steel fasteners.
• Low Viscosity: Wicks easily into threads to ensure complete sealing and locking.

Frequently Asked Questions

Which materials is LOCTITE® 221 compatible with?

LOCTITE® 221™ is formulated to work on various metal substrates, including brass, steel, and stainless steel. It is not generally recommended for use on plastics.

Is this threadlocker easy to remove?

Yes. It is specifically designed as a low-strength product, allowing for easy disassembly of fasteners using standard hand tools without the need for specialized equipment or excessive force.

What is the maximum thread size I can use this on?

This product is optimized for small-diameter threaded fasteners up to a maximum size of M12.

How long does it take to cure?

Cure time varies based on the substrate, gap size, and ambient temperature. On steel, typical fixture time is approximately 25 minutes. For applications where cure speed is a concern, such as large gaps or inactive surfaces, we recommend using LOCTITE® 7471 or 7649

Do I need to clean the parts before application?

For the best results, ensure all surfaces are clean and free of oil or grease. We recommend using a LOCTITE® 7063 to prepare the threads, allowing them to dry thoroughly before applying the adhesive.