The term "anaerobic" refers to being "without air," and anaerobic threadlockers are typically used in mechanical fastening applications that include a threaded component such as a screw or bolt. When applying an anaerobic threadlocker, the material fills any gaps between the threads, curing to create an incredibly strong bond. Ellsworth Adhesives suppliers anaerobic threadlockers from suppliers like Henkel Loctite and Permabond.