Description Tapered Roller Bearing NP310800/NP312191 TIMKEN BRAND MADE IN USA NP Taper Roller Bearings: NP part numbers are specified by original equipment makers for applications that are not served by conventional bearing designs. As vehicle performance levels evolve, older technology may require redesign to manage the high temperatures, stresses and synthetic lubricants. NP part numbers are designed for specific applications. While a bearing may appear interchangeable with another part number, it is not. Specific applications require specific bearings. In addition, bearing dimensions published in simple specification guides are only a few of the many detailed dimensions of the internal bearing geometry. Internal bearing geometry is a key to NP part numbers. Benefits: Original Equipment manufacturers exact specifications. Brand / Quality: Timken - High Quality Inside Diameter: 34.93mm = 1.375 inch Outside Diameter: 72.23mm = 2.8438 inch Width: 25.27mm = 0.9949 inch