Wing nuts round wing shape DIN 315-tempered cast iron plain M16

Wing nuts are manufactured according to DIN 315. There are two forms. The small (American) wing shape is smaller, requires less material to produce and is therefore cheaper. The large wing shape of the wing nuts is also called the German shape. It has nice, rounded wings and looks better for most applications.

The raw material for malleable cast iron is molten iron containing approximately 3 per cent carbon, 1 per cent silicon and 0.5 per cent manganese. A distinction is made between decarburised malleable cast iron (abbreviation: EN-GJMW) and non-decarburised malleable cast iron (abbreviation: EN-GJMB). Both types of malleable cast iron are considerably tougher than cast iron and are easy to cast. The special grade of malleable cast iron EN-GJMW-360-12 is weldable.

The term plain indicates a completely untreated, merely oiled, smooth surface for all DIN and ISO screws such as wood screws, hexagon head screws, threaded rods, nuts and many types of washers.