The pitch of this thread is very small, and the distance between threads in each turn is also very small, so it is often used to connect small parts. According to the standard of English thread, its pitch can be expressed as a fraction, in which the numerator is an integer and the denominator is an inch. Therefore, the pitch of 1 16 inch means 0/6 threads per inch, while the pitch of1mm means 0/.5875 threads per millimeter. Therefore, the thread with the outer diameter of 1 1mm and the pitch of 1mm belongs to English fine-tooth thread.