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Phillips countersunk self-tapping and self-drilling screws can be screwed directly into materials without pre-made threaded holes. The countersunk head is flat and aesthetically pleasing, suitable for industries with high appearance requirements, such as furniture manufacturing and interior decoration.

Self-tapping screws are suitable for fastening and connecting various materials such as metal, wood, and plastic, and have strong versatility. They are easy to install by oneself, requiring no additional installation tools, and can be fixed simply with a screwdriver or an electric screwdriver.

Phillips slot standard: GB/T944.1

Self-tapping thread standard: GB5280

Cross recessed countersunk head tapping screws, also known as flat head screws or countersunk screws, conform to the Chinese national standard GB/T846-1985 and adopt the ISO 7050:1983 international standard. These screws are widely used in the fields of power equipment, electronic machinery, household appliances, and construction engineering. 

The screw head is designed as flat or semi-countersunk, with a cross recess on top that can be fully embedded into the material surface to avoid protrusion. The materials are mainly carbon steel and alloy steel, with the carbon content in carbon steel being less than 2%. Alloy steel is classified into low, medium, and high categories according to the content of elements, and some types use SUS304 stainless steel. The threads are processed through metal wire heading and thread rolling technology to form a cylindrical structure, providing the capability for repeated disassembly. Specifications cover ST2.2 to ST9.5. This design offers a stable locking effect without damaging the material and is suitable for operation with conventional screwdrivers.