What other screw thread do you not know?

Screws have a lot of threads, and the most used ones are mechanical threads and self-tapping threads. Usually only people know these two threads. What other screw thread do you not know?

In fact, there are many non-standard screw thread, such as triangular threads, trapezoidal threads, T-threads, etc. Commonly used standard threads are standard coarse thread and standard fine thread.

Of course, there are also representations of different standard threads:

Threads of GB, DIN, JIS, etc. are all in millimeters and are collectively referred to as metric threads. In addition, threads such as ANSI, ASME, etc. are called American standard threads in inches. In addition to metric and American threads, there is also a BSW-inch standard, the thread is also in inches, commonly known as Wyeth thread.

Metric threads are in millimeters and have a cusp angle of 60 degrees. Both US and inch threads are in inches. The cusp angle of the US thread is also 60 degrees, while the cusp angle of the inch thread is 55 degrees. Due to the different units of measurement, the representation of various threads is not the same. For example, the M8-2X60 represents a metric thread. His specific meaning is that the nominal diameter of the screw is 8MM, the thread distance is 2MM, the length is 60MM, and another example is: 1/4-20X3/4 means the inch thread, his specific meaning is the nominal diameter of the screw. It is 1/4 inch (one inch = 25.4 mm) with 20 thread on one inch and 3/4 inches in length. In addition, if you want to indicate the US-made screws, it will usually be expressed by UNC and UNF, so as to distinguish between American-made coarse thread and American-made fine thread.

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