Below is a list of Threaded Fasteners manufacturers from Duarte, California. Threaded fasteners are fastening tools that feature raised spiral ridges on an angle wrapped around a shaft. These threads serve to connect fasteners together and keep them attached by preventing linear motion without a corresponding rotation. They are often found along the entire length or a portion of the shafts of screws, bolts or nuts. Most threads are on a 60° angle and are either exterior (male) or interior (female). The pitch of a thread is the distance between two individual threads, which can be large or small. Large pitches are considered coarse threads, while small pitches are fine.