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How to express the name of the unified thread series
There are two types of unified threads: No. XX notation and notation using fractions such as 1/4.
It may also be expressed using a decimal point, and 1/4-20 UNC and 0.250-20 UNC are the same unified thread.
Please refer to the following document for the size, nominal diameter, and number of unify screws.
This is a list of conversion tables from inches to mm, and you can also check decimal calling.
