Loctite 243 Threadlocker 50ml

Keep your machinery running reliably with Loctite 243, the industry-leading medium-strength threadlocker. Engineered for versatility and performance, this anaerobic adhesive prevents loosening caused by vibration, shock, and thermal expansion in threaded assemblies. Whether you are working on pumps, gearboxes, or presses, Loctite 243 ensures your fasteners stay secure while still allowing for easy disassembly with standard hand tools. 

Why Choose Loctite 243?

• Universal Application: Designed to work on all metal surfaces, including passive substrates like stainless steel, aluminum, and plated parts.
• Contaminant Tolerant: Formulated to perform consistently even in the presence of minor industrial oils, such as motor oil, cutting fluids, and corrosion protection agents.
• Vibration Resistant: Effectively locks threaded fasteners to prevent loosening in high-vibration industrial environments.
• Easy Maintenance: Provides a secure bond that can be reliably disassembled for routine servicing using standard tools.
• Industrial Certified: Features P1 NSF registration for use in food processing areas and is certified to ANSI/NSF Standard 61 for potable water systems.

Frequently Asked Questions

How does Loctite 243 work?

Loctite 243 is an anaerobic adhesive, meaning it cures when confined in the absence of air between close-fitting metal surfaces. Once applied to threads and assembled, it forms a tough, vibration-resistant bond that seals the fastener against moisture and corrosion while preventing loosening.

Is Loctite 243 suitable for all metal types?

Yes. Unlike older threadlockers that struggled with "passive" metals, Loctite 243 is specifically engineered to provide robust curing performance on both active metals (like brass and copper) and passive substrates (such as stainless steel, aluminum, and plated surfaces).

How do I remove fasteners secured with Loctite 243?

This product is designed for "medium strength" applications, meaning it can be removed with standard hand tools. In rare instances involving excessive engagement length, you may apply localized heat to the nut or bolt to approximately 250 °C to soften the adhesive for easier disassembly.

Can I use this on plastic components?

No. Loctite 243 is not recommended for use on plastics, particularly thermoplastic materials, as it may cause stress cracking. Always confirm compatibility with your specific substrate before application.