A screw refers to a screw (foreign name: Screw). It is a tool that utilizes the physical and mathematical principles of the circular rotation and frictional force of an object to gradually tighten objects and mechanisms. Screws are a common term for fasteners, and are spoken daily.
The metric thread is in MM (millimeters) and its cusp angle is 60 degrees. Both American thread and inch thread are in inches. The tip angle of the American thread is also 60 degrees, while the tip angle of the English thread is 55 degrees.
Due to the different units of measurement, the representation of various threads is also different. For example, M16-2X60 indicates a metric thread. His specific meaning is that the nominal diameter of the screw is 16MM, the pitch is 2MM, and the length is 60MM. Another example: 1 / 4-20X3 / 4 is the inch thread, and his specific meaning is the nominal diameter of the screw It is 1/4 inch (one inch = 25.4MM), there are 20 teeth on an inch, and the length is 3/4 inch. In addition, to indicate American screws, UNC and UNF are usually added to the back of the English screws to distinguish between American coarse teeth or American fine teeth.
Post time: May-31-2020