The so-called non-standard parts processing essentially means that these parts are not produced and manufactured in accordance with relevant regulations and requirements during the formation process. Parts of this nature will be used in both the metal industry and the non-metal industry. According to the actual needs, the specifications of many models are not completely produced as the design plan. After all, every device has its error value. Non-standard parts processing is of great significance and role to the equipment industry.

Non-standard parts processing refers to mechanical equipment that is not manufactured according to unified standards in terms of type, specification, performance, size, drawing, tolerance and fit, technical document number and code, technical language, measurement unit, and materials and process equipment used.

Non-standard parts are non-standard equipment, not equipment manufactured according to the unified industry standards and specifications promulgated by the state, but equipment designed and manufactured by themselves according to their own needs. Equipment whose appearance or performance is not in the national equipment product catalog. In order to meet the needs of large-scale industrial production, the mechanical equipment that has been produced and proved to be good in performance is finalized and serialized, which is called standard products. According to user requirements, on the basis of standard products, products that are produced, modified or customized are called non-standard products. The fields with more non-standard product occasions are mainly the chemical and petrochemical industries. Because there are many products in this industry and the processes vary widely, there are also many non-standard products.