BS 4320 Plain Washers are a type of washer that conforms to British Standard 4320. These washers are designed to be used in various applications where a flat surface and spacing is required between a bolt or screw and the material being fastened. They are typically made of metal and come in different sizes to accommodate different bolt sizes. BS 4320 Plain Washers are commonly used in construction, automotive, and industrial settings to provide stability and support in fastening applications. BS 4320 Plain Washers are a type of washer that conforms to British Standard 4320.