SEALANTS FOR THREADED METAL FASTENERS AND RIGID FLANGES FOR THE HVAC/R MARKET NuLock's anaerobic-based formulations are for metal fastener thread locking and sealing; including sealing of metal flange connections. NuLock is especially useful for flare fittings used in the HVAC/R market to improve their sealability and thread locking of these mechanical fasteners that are susceptible to leakage due to vibration. An anaerobic-based sealant remains liquid until isolated from oxygen with metal contact in fitting threads. To cure, the product requires lack of oxygen in close contact in fitting threads. Product cures due to lack of oxygen in close contact of metal surfaces. The process results in a chemical resistive cross-link polymer with great adhesion to metals that provides both a thread sealant and locking - depending on the application. NuLock is highly resistant to heat and vibrations, with excellent chemical resistance and temperature range. Simple hand tools are required when fasteners need to be dissembled.