Threadlocking

About Threadlocking

Threadlocking adhesives are anaerobic compounds that prevent nuts, bolts, screws, and threaded fasteners from loosening due to vibration, thermal cycling, or mechanical stress. These specialised adhesives cure in the absence of air between closely mating metal surfaces, creating a secure bond that maintains fastener integrity whilst allowing controlled disassembly when required. Unlike mechanical locking methods such as lock washers or nylon inserts, threadlockers fill the entire gap between threads, distributing load evenly whilst protecting against corrosion.

MyToolShed.co.uk stocks threadlocking products from trusted brands including Bondloc, Draper, Sealey, J-B Weld, and Everbuild, available in three standard strength grades: low strength (typically purple or blue) for small fasteners requiring regular adjustment, medium strength (blue or green) for general-purpose applications removable with hand tools, and high strength (red) for permanent bonds on critical assemblies.

Applications

Threadlocking products are essential across numerous trades and industries:

• Mechanical Engineers and Fitters: Securing fasteners on industrial machinery, pumps, gearboxes, and production equipment
• Automotive Technicians: Preventing loosening of engine components, suspension fasteners, brake assemblies, and exhaust systems
• Plant Maintenance Teams: Maintaining reliability of rotating equipment and processing machinery in manufacturing facilities
• Agricultural Engineers: Securing fasteners on tractors, harvesters, and farm equipment subject to constant vibration
• HVAC Installers: Locking connections on heating systems, ventilation units, and air conditioning equipment
• Electricians: Securing terminal connections and mounting hardware in control panels and distribution boards
• Construction Workers: Preventing loosening of scaffold fittings, formwork connections, and structural fixings
• Marine Engineers: Protecting threaded connections from vibration and corrosion in boat engines and deck equipment
• DIY Enthusiasts: Ensuring reliable connections on home repairs, workshop projects, and garden equipment maintenance

Choosing The Right Threadlocking

Thread Size: Low strength threadlockers suit small fasteners up to M12, preventing damage to fine threads during removal. Medium strength products work best for fasteners between M6 and M20, whilst high strength formulations are designed for larger bolts from M12 upwards where permanent assembly is required.

Disassembly Requirements: Low strength threadlockers permit easy disassembly with standard hand tools for adjustable components. Medium strength products require normal tools but more effort to remove. High strength threadlockers create permanent bonds requiring heat (typically 250°C) for disassembly.

Material Compatibility: Most threadlockers work excellently on steel fasteners, though stainless steel, aluminium, or brass may cure more slowly. Consider products with activators or primers for inactive metal surfaces.

Application Environment: Standard threadlockers perform well in most conditions, but specialist formulations exist for extreme temperatures, chemical exposure, or outdoor applications. MyToolShed.co.uk stocks professional brands with product numbering corresponding to industry-standard specifications (such as 222, 243, and 270 designations) for easy product selection.

Safety Information

Always wear safety glasses and nitrile gloves when handling threadlocking adhesives to prevent eye splashes and skin contact. Work in well-ventilated areas to avoid breathing vapours, particularly when applying larger quantities or working in confined spaces as required under COSHH regulations. If threadlocker contacts skin, soak in warm soapy water and gently peel apart—never force bonded skin. Store products in cool, dry conditions away from direct sunlight with bottles tightly sealed between uses.

Frequently Asked Questions

What's the difference between blue and red threadlocker?

Blue threadlocker is low to medium strength, designed for fasteners requiring regular maintenance or adjustment and allows disassembly with standard hand tools. Red threadlocker is high strength, creating permanent bonds for critical applications. Removal typically requires heating to approximately 250°C. Choose blue for serviceable connections and red for permanent assemblies.

How long should I wait before putting an assembly into service?

Fixture time varies by product and temperature but typically ranges from 10 minutes to 3 hours for handling strength. However, full cure takes 24 hours for maximum strength. Working at room temperature (20-22°C) provides optimal cure speeds—cold conditions significantly extend cure times.

Can I use threadlocker on stainless steel fasteners?

Yes, threadlocker works on stainless steel, though it may cure more slowly than on mild steel due to the inactive surface. For best results, consider using a surface activator or primer. The anti-corrosion properties of threadlocker are particularly valuable on stainless steel as they prevent galling—a common problem where stainless threads seize together.