LOCTITE threadlockers for reliable machine operation

Even a single loose screw can cause an unplanned machine shutdown, additional maintenance work or equipment damage. LOCTITE threadlockers help prevent metal threaded fasteners from loosening spontaneously due to vibration and impact. Their purpose is not only to secure the screw, but also to maintain clamping force and protect threads. Choosing the right adhesive during the planning of assembly and maintenance is therefore essential.

A Small Joint with a Major Impact on Machine Performance

In pumps, compressors, electric motors and gearboxes, the stability of threaded joints is an important factor in reliable operation. When a fastener starts to loosen, the consequences are not limited to a single screw: components may shift, readjustment may be required and unplanned downtime may occur. Threadlocking is therefore a preventive measure, not just a solution applied after a problem has arisen.
LOCTITE sums this up with the message “Reliability starts here.” In industrial assembly, this means carefully selecting the appropriate locking method before equipment is commissioned, while taking into account the joint requirements and planned maintenance needs.

 

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How Do Anaerobic Threadlockers Work?

Anaerobic adhesives cure in the absence of air when confined between closely fitting metal surfaces. After application and assembly, they fill the gaps between the threads of a screw and nut or a threaded hole. The cured adhesive bonds the threaded surfaces together, preventing relative movement and spontaneous loosening caused by vibration.
Unlike mechanical locking devices, which act at individual contact points, the adhesive works within the threaded joint itself. In addition to locking the joint, it creates a protective barrier that helps prevent corrosion and thread seizure. Filling the gaps also restricts the passage of liquids through the thread. However, threadlocking for fasteners should not be confused with sealing threaded pipe connections: these require a suitable dedicated thread sealant.

More Than Just Protection Against Loosening

For maintenance purposes, it is important that a correctly selected threadlocker combines vibration resistance, thread protection and the possibility of planned disassembly. Low- and medium-strength grades allow disassembly with conventional hand tools, so using an adhesive does not necessarily mean creating a permanently non-removable joint.
Within its technical limitations, one product can be used for several sizes of threaded fasteners. This can simplify threadlocker stock management and reduce the need for additional mechanical locking components in different sizes. The greatest benefit, however, is preventing problems that could require reassembly, repairs or production interruptions.

VIDEO: See how LOCTITE threadlockers protect threaded joints >>

Where Are Threadlockers Used in Industry?

Typical applications include fastening screws on pumps and motors, bearing housing screws, adjustment screws, threaded studs, and screws on couplings and flanges. They are also used to secure pump impellers and in other threaded joints in machinery. For every application, the assembly design, thread material, operating temperature and equipment manufacturer's requirements must be taken into account.  

Typical applications

Proper Preparation and Application Determine the Result

Before applying the product, remove contaminants and degrease the threads if necessary. A product's tolerance of small amounts of residual oil does not mean that it is suitable for heavily contaminated surfaces. Apply the adhesive to the contact area between the threads, assemble the joint and tighten it to the specified tightening torque. For joints that have already been assembled, use a product specifically designed for this type of application.
Initial fixture strength is not the same as full cure. Before loading the joint, observe the curing time specified in the technical data sheet. Curing time is affected by the selected adhesive, the metal surface and the temperature. An activator may be useful under certain conditions, but only in accordance with the instructions for the specific product. Using a threadlocker does not replace proper joint design or the prescribed assembly procedure.

Which LOCTITE Threadlocker Should You Choose?

Maximum strength is not always the best choice. A joint that is regularly disassembled during servicing requires a different approach from a threaded stud intended for permanent locking. Other important factors include thread size, adhesive viscosity, the material and condition of the surface, and whether the adhesive is applied before assembly or to a joint that has already been assembled.

 

The data applies to the products listed. For application and disassembly, consult the current technical data sheet.

Comparison of LOCTITE threadlockers by strength, thread size and disassembly method

LOCTITE 243 is a practical choice for general industrial maintenance when medium strength and subsequent disassembly with hand tools are required. It is also suitable for passive metal surfaces such as stainless steel and aluminium, and tolerates small amounts of certain residual oils. In addition to the 50 ml package, the online shop also offers LOCTITE 243 in a 250 ml package.
Colour alone is not sufficient for product selection. For example, both LOCTITE 270 and LOCTITE 290 are green, but the former is intended for high-strength locking, while the latter, thanks to its low viscosity and capillary action, is primarily intended for post-assembly locking of joints that have already been assembled. The product designation and its technical data sheet are the decisive factors.

Renewed Formulations and Packaging Containing Recycled Plastic

For the new generation of selected LOCTITE threadlockers, Henkel highlights renewed formulations without CHP and APH ingredients. The European product range also includes LOCTITE 243 and LOCTITE 270. According to the manufacturer, the reformulation retains key properties such as viscosity, torque and shear strength, and temperature resistance. The focus is on improving the formulations without compromising the required technical performance.
The change also includes new bottles for anaerobic products in 50 ml and 250 ml sizes containing 50% post-consumer recycled plastic (PCR). In this way, Henkel replaces part of the virgin plastic with recycled material. This is a specific packaging improvement, separate from the function of the adhesive in the threaded joint.
These updates apply to the renewed product versions. When selecting and using a product, always check the current technical data sheet and safety data sheet for the specific product, as well as the information on the packaging. A renewed formulation does not remove the requirements for safe handling.

Choose the Right Threadlocker Before a Screw Causes Downtime

A reliable threaded joint is the result of correct product selection, surface preparation and assembly. Explore the M&M Intercom range to find the LOCTITE threadlocker suited to your operating conditions: from low-strength products for small screws to high-strength grades and products designed for post-assembly application.
Need help choosing? Tell us the thread dimensions and material, operating temperature and intended disassembly method. We will advise you on selecting the right product for your application.

 

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Related content:

• Loctite adhesive product range (Henkel)
• Threadlocker product range
• Article about Loctite 55

 

Text and image source: Henkel. Product information and links: M&M Intercom online shop.