Imperial tapered roller bearing is a kind of bearing that supports the rotating body of machinery and reduces the friction coefficient during its movement. It is specially designed for inch-sized devices. The structure and assembly dimensional accuracy and rotation accuracy of this bearing are different from those of metric bearings, and are mostly used in imported machinery or industries with special needs. The external dimensions and tolerances of imperial tapered roller bearings are expressed in imperial units, which are suitable for inch-sized devices, such as inches. Its structure types include single row, double row, four row, etc., and its working performance is the same as the corresponding metric tapered roller bearings. Imperial tapered roller bearings are widely used in automobiles, rolling mills, metallurgy, plastics machinery and other industries. Their correct use and maintenance directly affect the surface quality of machined parts and the service life of tools. In addition, the use of inch tapered roller bearings also involves multiple functions such as cooling, lubrication, cleaning, and rust prevention to ensure product quality and reduce operating costs. When selecting rust-proof materials, strict quality inspection is required to ensure that the quality of the materials meets the process requirements to ensure the performance and service life of the bearings.