DIN 931 Hex Bolt (ISO 4014) 10.9 Zn

Hex head DIN 931 (ISO 4014). Partially threaded. Bright zinc-plated (ZN). Poor climate and weather resistance!
Metric thread. Property class 10.9.
Width across flats according to the DIN standard.

A hex bolt (nut head, hex head bolt) is the most commonly used fastener in machine and equipment installations. The head shape provides a good grip, and the tools used for installation provide a secure hold for tightening the fastener to the correct torque. A hex bolt is known by many common names, such as bolt, screw, machine screw, nut head screw, threaded bolt, or threaded screw, to name a few of the most common.