What is another word for cotter pin?
Pronunciation: [kˈɒtə pˈɪn] (IPA) 
Cotter pins are a type of fastener that can be used to secure parts of machinery or other objects from coming loose. They typically consist of a tapered metal pin with a hole near the end, and a separate piece of metal called a cotter that can be inserted through the hole to hold the pin in place. Synonyms for cotter pin include split pin, cottar pin, R-clip, hairpin clip, and hitch pin. These terms all refer to similar types of fasteners that are designed to prevent mechanical parts from moving or separating, and are commonly used in automotive, industrial, and construction applications.
