非标零部件是相关于标准零部件提出来的。大连精密零部件加工标准零部件是指结构、尺寸、画法、标记等各个方面已经完全标准化，并由专业厂生产的常用的零（部）件，如螺纹件、键、销、转动轴承等等。广义包括标准化的紧固件、连结件、传动件、密封件、液压元件、气动元件、轴承、弹簧等机械零件。狭义仅包括标准化紧固件。海内俗称的标准件是标准紧固件的简称，是狭义看法，但不可排除广义看法的保存。别的另有行业标准件,如汽车标准件、模具标准件等，也属于广义标准件。

Non standard components are proposed relative to standard components. Dalian Precision Parts Processing Standard Parts refer to commonly used components such as threaded parts, keys, pins, rolling bearings, etc., whose structure, dimensions, drawing methods, markings, and other aspects have been fully standardized and produced by professional factories. Broadly speaking, it includes standardized mechanical parts such as fasteners, connectors, transmission components, seals, hydraulic components, pneumatic components, bearings, springs, etc. Narrowly defined, it only includes standardized fasteners. The commonly known standard component in China is the abbreviation for standard fasteners, which is a narrow concept, but the existence of a broad concept cannot be ruled out. In addition, there are industry standard parts, such as automotive standard parts, mold standard parts, etc., which also belong to general standard parts.