It is best to explain the standard industry, thank you!
non-standard parts: the user made a more special zero (part) pieces. The user made detailed requirements, data and information, manufacturers produced according to user requirements.
special parts: only in a product on the use of zero (Department) pieces. That is designed for a particular product and numbered.
, common parts: in different types or different types of products with different specifications can be used interchangeably, a wide range of applications, and sometimes can not locate the standard parts.
standard parts: with the standard code of the zero (parts), components and purchased parts. There are generally national standard parts, professional standard parts and enterprise standard parts.
Follow the pieces: that is, in the new project without redesign and development, directly to the old models to take over the use of parts.
