This is a high-strength, M6x16mm metric socket screw with a button head and a built-in flange, according to ISO 7380-2. It is made of steel with a strength class of 10.9, meaning it is extremely strong. The black zinc-nickel coating provides superior corrosion resistance, and the hexagon socket drive makes it suitable for applications with limited access. 

Technical breakdown

• Type: ISO 7380-2, which is a button head screw with a collar/flange and hexagon socket. The flange acts as a built-in washer, distributing the load more evenly.
• Dimensions:
  • M06x016: M6 metric thread with a length of 16mm.
  • Flange: The head has a built-in flange, which is sometimes called a "flanged button head".
• Material and Strength:
  • FK 10.9: The screw is made of steel with a strength class of 10.9, indicating a high-tensile strength. This is suitable for demanding applications like automotive and heavy machinery.
• Coating and Color:
  • Zinc-nickel black (ZNBHL): A protective coating of zinc-nickel that is colored black. This offers excellent corrosion resistance compared to standard zinc plating.
• Drive:
  • Hexagon socket: The screw uses a hex or "Allen" key for tightening, making it easy to use in tight spaces.