A nut with a built in washer like flange. Tee. A nut designed to be driven into wood to create a threaded hole. Square. A four sided nut. Prevailing torque lock. A non-reversible lock nut used for high temperature applications. K-Lock or Kep. A nut with an attached free-spinning external tooth lockwasher.
adjective. The definition of metropolitan is a city or something related to a city. A city and the immediate locations surrounding it is an example of a metropolitan area.
What is a Metropolitan Statistical Area (MSA)? An MSA is a geographic area comprised of a parish (or county) with a central city (or twin cities) of 50,000 inhabitants or more, plus contiguous parishes that have close economic and social relationships with the central parish.