Precision parts processing can be divided into standard parts and non-standard parts processing according to the processing object,
relatively speaking, standard parts processing is relatively easy, and non-standard parts processing is relatively difficult.

Non-standard parts are proposed relative to standard parts, standard parts refer to the structure, size, drawing,
marking and other aspects have been completely standardized, and commonly used parts produced by professional factories,
such as automobile standard parts, mold standard parts, etc..