本SAE推荐实施规程适用于6、7和8级载重汽车/载重汽车牵引车非动力前桥、动力和非动力后桥以及拖车车轴上使用的轮毂和轮辐，其轴承设置可手动调整。使用垫片控制轴承预载和端隙的组件可能在几何形状和轴承部件方面有所不同。

This SAE Recommended Practice is intended for hubs and spoke wheels used on Class 6, 7, and 8 truck/truck-tractor non-powered front axles, powered and non-powered rear axles and trailer axles, for which bearing setting is manually adjusted. Assemblies using spacers to control bearing preload and endplay may differ in geometry and bearing componentry.