Weicon WEICONLOCK AN 302-42 Anaerobic Threadlocker Sealant

Weicon WEICONLOCK AN 302-42 Anaerobic Threadlocker Sealant is an anaerobic industrial adhesive used to reduce loosening in threaded joints while also providing a sealing effect. It cures between metal surfaces where oxygen is limited, aiming to fill the thread gaps and support joint security against vibration-induced loosening. Since it is positioned in the medium-strength class, it focuses on maintaining a balance that allows removal with standard hand tools during maintenance. Its blue and fluorescent appearance is a practical detail that makes application control easier.

Threadlocking and sealing with the AN 302-42 industrial adhesive
This product is an anaerobic industrial adhesive system used for “threadlocking” in threaded connections and is specified for use up to M36 fasteners. Its medium viscosity helps it spread in a controlled way on the threads while reducing unwanted run-off during assembly. A maximum gap-filling capacity of 0.2 mm supports forming a continuous sealing line even on tolerance-prone threads. Having a hygiene approval under KTW-BWGL for drinking-water applications can provide an advantage for documentation and compliance in suitable processes.

Technical performance and service durability
The medium-strength character is defined with a breakaway torque of 14–18 Nm and a prevailing torque of 5–8 Nm, aiming to balance security with service removability. Since shear strength is given as 8–12 N/mm², the bond line is intended to contribute not only to “locking” but also to load transfer in the threaded joint. Reaching handling strength within 10–20 minutes and specifying 3–6 hours for full strength supports predictability when planning maintenance windows. A temperature resistance range of -60 °C to +150 °C is stated, supporting joint stability under varying service conditions.

Use concept in pressurized systems
Because this industrial adhesive aims to limit micro leak paths by filling thread gaps, it is also preferred in assemblies where sealing is expected. Maximum pressure resistance values are specified for some screw sizes (e.g., higher for smaller diameters and lower for larger ones), which can be used as a reference in system design. The critical point is that sealing performance should be assessed together with correct thread geometry, sufficient product amount, and appropriate assembly torque. When application parameters are standardized, more repeatable results are targeted in joints exposed to vibration and thermal cycling.

Application method, surface preparation, and sectoral use
Degreasing and cleaning the threads before application is recommended; the cleaner the surface, the more consistent the results are expected to be. The product is applied as a ring on the thread using the dosing nozzle, and direct contact between the nozzle and metal is to be avoided. Curing begins once parts are assembled and tightened; product that has contacted metal must not be poured back into the bottle, because even tiny metal particles can cause premature curing inside the container. In serial assembly, using a dosing device offers process advantages in both cleanliness and repeatability of quantity.

This industrial adhesive can be considered for securing threaded elements against loosening in machinery manufacturing, maintenance and repair, HVAC equipment installation, pump-to-chassis connections, switchgear, and general industrial assembly. In flanged or fastener-based systems, it targets both joint stability at points with loosening risk and a sealing effect between threads. Not commissioning the system before curing is complete is important for performance continuity, especially in systems exposed to load and vibration. With proper surface preparation and controlled dosing, the goal is to manage joint security, serviceability, and sealing expectations together.