Product Name: Self Tapping Screw Csk Head Flat Head Countersunk Slotted Head Cross Head Phillips Model NO.: self tapping screws DIN7982 st4.8 Type: Fasteners Material: metal Technics: Casting Surface Treatment: Yes Certification: CCC, SGS Application: Machine Parts, Transportation, Decorations Trademark: Nute Transport Package: Box, Carton, Pallet Specification: DIN,ANSI,BSW,JIS,GB,AU,ISO Origin: China HS Code: 73181400 Product Description Head: Flat and Oval CSKDia of Thread: 2.2~6.3mmMaterial: Stainless steel, Carbon steel, Brass ectStandard: DIN, ASIN, BSW, JIS, ISO, AU ectSelf-tapping is the ability of a screw to advance when turned, while creating its own thread. This ability is sometimes created by a gap in the continuity of the thread on the screw. These edges cut a thread as the screw is driven in to the material. The cutting edge drills away the material, leaving a hole for the screw to go into.Self-tapping screws are used in a variety of applications ranging from DIY to surgery. A dental implant is an example of a self tapping screw used in surgery.