Key 08 : A piece of metal, usually square in cross section or half-round, used to locate a pulley, gear etc, on a shaft and prevent it rotating relative to the shaft
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}