DIN 6921 Hex Flange Screw HV90 Zn Serrated

Material: steel.
Fully threaded, metric thread.
Bright zinc plated (ZN).
Strength class CL.90.
Flanged hex head. Not compliant with the DIN standard.

A flanged hex bolt (flange bolt, nut head, hex head bolt) is the most commonly used screw fastener in machine and equipment assembly. The head shape provides a good grip, and the tools used for installation allow the fastener to be tightened to the correct torque. The fixed flange (i.e. washer) under the bolt head speeds up installation. 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: uncoated steel (ST), zinc plated (bright zinc, ZN, zinc), zinc flake coated (ZNF, Delta, Ruspert), stainless steel (A2), and acid-resistant steel (A4).