WEICON WEICONLOCK AN 302-70 Anaerobic Thread Sealant

WEICON WEICONLOCK AN 302-70 is an anaerobic industrial adhesive solution focused on preventing loosening in threaded connections and stud bolts. It cures in narrow gaps between metal surfaces when contact with air is cut off, filling thread clearances and helping increase joint stability under vibration. Its green color makes the application line easier to visually follow and supports establishing a standardized assembly discipline in production and maintenance processes. With its suitability approach for drinking-water applications, it offers a profile that can also be considered in plumbing and process lines where hygiene is critical.

Technical structure and operating principle of AN 302-70

This product is an anaerobic, resin-based industrial adhesive that cures when it is oxygen-deprived between metal surfaces, aiming to deliver a combined locking + sealing effect in threaded joints. Its medium-viscosity structure supports controlled spreading on the threads while helping fill clearances. It is specified for use on threaded connections up to M20 (R 3/4”) and contributes to tolerance management with a maximum gap-bridging capability of 0.15 mm. Since the Brookfield viscosity at +25 °C is given as approximately 500 mPa·s, a balanced behavior between flow and control can be expected during application. The manufacturer is WEICON GmbH & Co. KG and the origin is Germany.

Performance features, strength approach, and advantages

AN 302-70 is positioned in the high-strength class, so it is preferred for connections where permanent locking is required and disassembly planning should be made accordingly. The breakaway torque for threaded connections is stated as 28–35 Nm, supporting a locking character aimed at reducing vibration-related loosening risk. By filling thread gaps, it helps close capillary leak paths and improves joint integrity. Its suitability approach for drinking-water applications and DVGW approval can be selection criteria in certain installation scenarios. These features make it stand out as an industrial adhesive in fields where both assembly security and sealing are expected.

Application method and surface preparation

For best results, surfaces should be cleaned of oil, dirt, and loose oxides; a clean metal surface directly determines performance in this type of anaerobic industrial adhesive application. The product is applied evenly to the thread with the dispensing tip, and the connection is assembled quickly to achieve the target tightening. In serial production, using dosing equipment helps both control consumption and achieve repeatable quality. Not allowing the dispensing tip to contact metal directly and not returning product that has contacted metal back into the bottle are critical practices to prevent premature curing inside the container. After application, loading and commissioning should be planned according to the facility’s process requirements.

Industry applications and maintenance notes

This industrial adhesive can be considered for permanent locking on auxiliary threaded connections of equipment such as gearboxes, pumps, and compressors in machine manufacturing, and on stud bolts and fasteners in maintenance and repair. In the energy and process industries, it helps reduce loosening in vibration-exposed joints and supports sealing requirements. If use is planned in installations related to drinking water, compatibility with system materials and operating procedures should be verified under field conditions. Due to its high-strength nature, planning with appropriate equipment and methods is good practice for maintenance scenarios requiring disassembly. The product is specified to have a storage stability of at least 24 months at room temperature in its unopened original packaging and should be protected from heat sources and direct sunlight.