What do you mean by non-standard? What is the national standard?

Non-standard means non-standard, and there is no national standard or industry standard to be based on.

1, standard parts are parts that meet the requirements of national standards and industry standards. There are common parts in the market, you can buy and exchange them at will.

2. At present, manufacturing enterprises are doing non-standard design, and standard parts are finalized. What else should they design? But the mechanical principle and other design principles are the same, just combining some standard parts with non-standard parts.

(1) National standards are divided into mandatory national standards and recommended national standards.

(2) Mandatory national standards shall be formulated for the technical requirements for safeguarding personal health and life and property safety, national security, ecological environment safety and meeting the basic needs of economic and social management. Mandatory national standards are proposed, drafted, solicited opinions and reviewed by the relevant administrative departments in the State Council, and the standardization administrative department in the State Council is responsible for project establishment, numbering and external release. Mandatory national standards approved or authorized by the State Council.

(3) Recommended national standards can be formulated to meet the basic universal needs, match the mandatory national standards and lead the technical requirements of related industries. Recommended national standards shall be formulated by the administrative department of standardization of the State Council.

(four) the standardization administrative department in the State Council and the relevant administrative departments in the State Council shall establish a standard implementation information and evaluation mechanism, and review the national standards according to the feedback and evaluation. The review period shall generally not exceed 5 years. After examination, standards that do not meet the needs of economic and social development and technological progress should be revised or abolished in a timely manner.

Reference: Baidu Encyclopedia: National Standards