非標零部件是相對于標準零部件提出來的。大連精密零部件加工標準零部件是指結構、尺寸、畫法、標記等各個方面已經完全標準化，并由專業廠生產的常用的零（部）件，如螺紋件、鍵、銷、滾動軸承等等。廣義包括標準化的緊固件、連結件、傳動件、密封件、液壓元件、氣動元件、軸承、彈簧等機械零件。狹義僅包括標準化緊固件。國內俗稱的標準件是標準緊固件的簡稱，是狹義概念，但不能排除廣義概念的存在。此外還有行業標準件,如汽車標準件、模具標準件等，也屬于廣義標準件。

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.