The G-KRR-series wide-inner-ring ball bearings are the same as the RR series and have a provision for relubrication. These bearings are designed for extremely dirty or wet conditions Bearing includes R-seals with flared lips that firmly contact the ground O.D. of the inner ring; the inner ring provides a positive seal against dust, dirt and other contaminants, and effectively retains the lubricant G-KRR-series bearings are equipped with shroud-seals, providing extra effectiveness and protection Extra-wide design provides additional shaft support and extra-large grease capacity Suggested shaft tolerances:1/2 in. 1 15/16 in., nominal to -0.013 mm, -0.0005 in.;2 in. “ 2 15/16 in., nominal to -0.025 mm, -0.0010 in.