Self-tapping screws are screws with a drill bit, used in non-metallic or softer metal connections, and can be screwed directly into the material without pre-drilling. Common self-tapping screws include hexagon head screws, cross slot screws, pan head screws, countersunk screws, etc. The performance grades are usually 4.8, 8.8, etc. The thread diameters range from M2 to M16, and the common lengths are 10mm, 12mm, 16mm, etc. The surface treatments include electroplating, oxidation, and phosphating. As an efficient and convenient fastener, self-tapping screws are widely used in various industrial fields. Haina has various types of screws with complete specifications and sizes, including DIN7971, DIN7976, DIN7982, GB845, GB846...