Non-standard spare parts are proposed relative to standard parts. Standard parts refer to the structure, size, drawing, marking and other aspects have been completely standardized, and the common parts (parts) produced by professional factories, such as threaded parts, keys, pins, rolling bearings, etc..
Non-standard spare parts in a broad sense include standardized fasteners, links, transmission parts, seals, hydraulic components, pneumatic components, bearings, springs and other mechanical parts. Narrow sense only includes standardized fasteners. Domestic standard parts commonly known as standard fasteners is short for the narrow concept, but can not exclude the existence of a broad concept. In addition there are industry standard parts, such as automotive standard parts, mold standard parts, etc., also belong to the broad sense of standard parts non-standard parts are mainly the state did not set out strict standard specifications, no relevant parameters outside the provisions, by the enterprise free control of other accessories. There are many varieties of non-standard parts, and there is no standard classification.
We mainly introduce the following metal non-standard parts.
The drawings are provided by customers, and manufacturers use the equipment to make the corresponding products according to the drawings, usually molds mostly, tolerance requirements, finish are specified by customers, there is no certain paradigm. The product from casting to finishing completely requires the corresponding quality control, the process is complex and variable, and the general cost is higher than the standard parts.