本SAE推荐实施规程中包括被公认为SAE标准的高、低类型冠形螺母的完整通用和尺寸数据。这些螺母主要用于汽车和其他地面机动车辆以及工业设备，在螺栓、螺柱或螺钉端部提供装饰性或保护性封闭。

Included in this SAE Recommended Practice are complete general and dimensional data for the high and low types of crown nuts recognized as SAE Standard. These nuts are primarily intended for application in automotive and other ground-based motor vehicles and industrial equipment to provide an ornamental or protective closure over end of bolts, studs, or screws.