A flat washer M7 x 30 is a mechanical fastening component often used in construction and industrial applications. The 'M7' denotes a metric thread with a 7-millimeter diameter, while the '30' indicates the washer's outer diameter in millimeters. These washers are typically used to distribute the load over a larger surface area and prevent nuts or bolts from pulling into the material. They are ideal for use with screws and bolts in wood, metal, or plastic. Flat washers provide additional stability and security for various construction and assembly projects.