DIN 439 MF Low Hex Nut 04. Zn Fine Thread

Material: steel. Property class 04. Metric thread, fine thread (MF). Bright zinc plated (Zn), moderate weather resistance.
Product also available uncoated (St).

Special nuts generally refer to nuts whose design, application, dimensions, or other characteristics differ from a standard hex nut.
Examples include low nuts (thin nuts), flange nuts, castellated nuts, rivet nuts, square nuts, diamond nuts (diamond-shaped profile), sheet metal nuts, and welding nuts.
Materials include uncoated or zinc-plated steel (bright zinc, Zn, zinc), stainless steel (A2), and acid-resistant stainless steel (A4).
How to choose the right nut? As a rule, the nut’s hardness, material, and coating should be at least equivalent to those of the threaded fastener used with it (bolt or screw).