Thread Lock

Thread locks, or threadlocking adhesives, are anaerobic adhesives designed to secure threaded fasteners like nuts, screws, and bolts.

This liquid screw lock glue works by curing in the absence of air and in the presence of metal ions, forming a strong bond that prevents loosening due to vibration, thermal expansion, and shock.

At RS Australia, we offer a comprehensive range of threadlockers, available in various strengths indicated by colour. With options like red, green, and purple threadlockers, there’s a suitable product for every application, from temporary seals to permanent high-strength bonds.

Key Benefits of Threadlocking Adhesives

Threadlocking adhesive offers multiple advantages, primarily ensuring the integrity and safety of mechanical assemblies.

• Improves reliability: By creating a strong bond that resists vibration and thermal movement, thread locks enhance the overall reliability of assemblies and systems.
• Reduces maintenance: Securing fasteners with threadlockers minimises the need for frequent retightening. This reduces operational downtime and lowers labour costs over the system's lifespan.
• Prevents equipment failure: Thread lock sealants prevent loosening that could lead to component failure. They also offer corrosion resistance, safeguarding fastener integrity.

Types of Threadlockers by Strength Grade

Threadlockers are available in different strength levels, indicated by colour. This variety ensures there is a suitable thread lock glue for securing every type of mechanical joint, from short-term seals to permanent bonds.

Red Threadlocker (High Strength)

The red threadlocker offers high-strength, permanent threadlocking for large fasteners (M20 thread diameters and above). This adhesive prevents loosening under extreme vibration and stress. Due to its strength, disassembly requires localised heat exceeding 250°C.

Ideal for:

• Permanent assemblies
• Heavy machinery
• Structural bolts
• Press fits

Green Threadlocker (Medium Strength)

Green threadlockers are a medium-strength, wicking grade adhesive for pre-assembled fasteners. Their low viscosity allows them to penetrate threads by capillary action, meaning they can be applied after the joint is fully assembled.

Removal typically requires only standard hand tools and moderate heat.

Ideal for:

• Securing pre-assembled bolts
• Locking set screws
• Sealing porosity in castings

Purple Threadlocker (Low Strength)

Purple threadlockers are low-strength and designed for easy removal from small fasteners and delicate assemblies, such as those involving M2 to M6 sized screws (threads from 2mm to 6mm diameter).

They are suitable for brass, aluminum, and plastic components, requiring only hand tools for quick disassembly.

Ideal for:

• Small screws
• Electronics
• Instrumentation
• Pneumatic fittings

How to Choose the Right Threadlocking Adhesive for Your Application

Consider the following factors when selecting a threadlocking adhesive to ensure a reliable and appropriate bond for your application.

• Strength grade: Choose the appropriate colour/grade based on your disassembly requirements. For example, choose a green (medium) option for applications that need maintenance access. Meanwhile, a red (high strength) glue would be more suitable for permanent locking in critical applications.
• Cure time and process: Match the screw lock glue's cure time to your production speed. Some adhesives cure quickly with an activator, while others require a slower, anaerobic process.
• Operating temperature range: Ensure the thread lock can withstand the maximum and minimum temperatures of your operating environment.
• Material compatibility: Verify that the adhesive works with your materials. For instance, some formulations are specially designed for passive metals like stainless steel, but may not bond well with plastic substrates.
• Thread size and gap: Thicker adhesives are needed for large threads (M20+), while smaller threads require low-viscosity adhesives to ensure proper wetting.

Common Industry Applications

Thread lock glue is a versatile solution used across various industries where fastener integrity is critical for safety and performance.

Manufacturing and Assembly

Threadlocking adhesive is used extensively to secure fasteners on equipment during assembly. For example, medium-strength threadlockers ensure bolts do not loosen on production line robotics, maintaining machine reliability under constant motion.

Maintenance and Repair

Thread lock sealant is crucial for preventing existing bolted joints from vibrating loose after being serviced. Technicians use low-strength formulas for components requiring frequent adjustments, balancing security with ease of removal.

Automotive and Transport

Engines, transmissions, and brake systems rely heavily on thread locking adhesives to lock critical fasteners against the high vibration and thermal cycling inherent in vehicles. This ensures component safety and longevity.

Heavy Machinery

High-strength threadlockers (red) are applied to structural bolts and high-stress points on large equipment like cranes or excavators. This guarantees permanent security under extreme dynamic loads and forces.

Hydraulics and Pneumatics

In fluid fittings and ports, thread locking glue provides a crucial secondary seal. This prevents both air and fluid leakage, ensuring the integrity of the system's pressure-holding capabilities and efficiency.

Shop Reliable Threadlockers at RS Australia

As your trusted supplier and distributor of adhesives and sealants, RS Australia offers an extensive selection of performance thread lock products. Our range is sourced from reputable brands like Loctite, Rocol, and RS PRO, ensuring reliable and high-quality options for every application.

Beyond screw lock glues, we also provide a wide array of other sealing and adhesive options, such as epoxy adhesives, hook and loop strips, and silicone sealants, to meet all your project needs.

Browse our user-friendly online site for the full range and have your items shipped right to your door. With our flexible and swift delivery options, we ensure the timely arrival of your goods at your convenience.

For more details on our delivery times and fees, please check out our delivery information page.