Analysis Of Screws, Self-drilling Screws, Wood Screws, Three Differences
1 screw: also by the head and screw the two parts of a fastener, use can be divided into three categories---machine screws, set screws and special screws. Machine screws are mainly used for a part with inner screw, with a through-hole fastening between parts, do not need to meet a nut (this form of connection is known as a screw connection is also detachable connection or you can tie in with the nut, two fastening with through-hole parts. Set screws are mainly used for fixing the relative positions between the two parts. Screw screw rings for special purposes, for hoisting parts.
2 self tapping screw: similar with machine screws, screw thread for the special tapping screws with thread. Used to connect two thin metal fastening components, making it into a whole, need to make small holes in the component, because the screw has a higher hardness, can be directly screwed into the holes in the component, unit hole in the corresponding thread. This form of connection is also removable connections.
3 wood screw: also similar with machine screws, screw thread for the special thread for wood screws, can be directly screwed into the wooden components (or parts), used for through-hole with a metal