Hatch fastening is a type of fastening used to secure hatches, such as those found on boats and ships. It is typically made up of two parts: a BATTEN, which is a thin strip of wood or metal, and a fastener, which is usually a screw or bolt. The BATTEN is inserted into the hatch frame and then secured with the fastener. This type of fastening is strong and reliable, making it an ideal choice for securing hatches in marine environments.