How Do Small Screws Convert From The American To The Metric?

The standard for American thread(UNF) is widely used in the United States, and the more used in China is the metric thread. How do small screws convert from the American to the metric?

Metric threads are expressed in pitch, typically in millimeters; and American threads are expressed in terms of the number of teeth used in inches, which is the biggest difference between them. UNF small screws should be converted into metric small screws. The unit is first converted, and the conversion method is also very simple. By multiplying the UNF size by 25.4, the metric size can be obtained. Secondly, the number of UNF thread is converted into a metric pitch; then the thread tolerances 1A, 2A, 3A, 1B, 2B, 3B are converted into thread tolerances 4H, 5H, 6H, 4h, 6g. This completes the conversion between the UNF small screws and the small metric screws.

How do you learn how to convert small screw into metric screw? Have you learned? Reminder: metric mechanical threads and imperial uniform threads are generally not converted, because they can not be equivalent to conversion, and can not be used interchangeably, so pay attention to when converting.

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