DIN 933 Hex Head Screw (ISO4017) 10.9 Zn

Steel material, with relatively low corrosion resistance. Fully threaded, metric thread. Bright zinc-plated (Zn). Strength class 10.9. Hex head.

A hex bolt (nut head, hex head, hexagon head bolt) is the most commonly used threaded fastener in machine and equipment installations. The shape of the head provides a good grip, and the tools used for installation allow the fastener to be tightened to the correct torque. In everyday language, a hex bolt is known by many names, such as bolt, screw, machine screw, nut head screw, threaded bolt, or threaded screw, to name a few of the most common.
Materials include uncoated or zinc-plated steel (bright zinc, ZN, zinc), hot-dip galvanized (KS, HDG), stainless steel (A2), and acid-resistant steel (A4).