screw nut

Nut is a mechanical component used to tighten parts, and its internal thread shape and size have strict national standards. Nuts are used in conjunction with bolts or screws to secure two parts together. The material of nuts is usually metal, such as carbon steel, stainless steel, copper, etc., as well as non-metallic materials such as plastic. Nuts come in various shapes and specifications, such as hexagonal nuts, square nuts, wing nuts, etc., to meet different usage needs and conditions. Nuts are widely used in various mechanical equipment, construction, bridges, railways, and other fields.