Material and Performance: These screws are commonly made from stainless steel, with common grades being A2 (for general corrosion resistance) and A4 (for improved acid resistance). The performance standards are typically GB/T 3098.21 for stainless steel mechanical properties.
Point Types: The DIN7981 standard includes different point shapes. The C-type is a pointed end for thread-forming, while the F-type has a flat end with no point. Your mentioned "Pilot Point" typically corresponds to the C-type design.
Technical Standards: The technical conditions for these screws reference several Chinese national standards (GB) that align with the DIN requirements, including GB/T 944.1 for the cross recess (Phillips drive) and GB/T 5280 for the self-tapping thread.
Surface Treatment: For stainless steel screws, the surface is typically either left as the natural本色 or undergoes passivation treatment to enhance corrosion resistance.
