Precision ground on all contact surfaces. Recommended for applications requiring the accuracy of rotation and quiet performance of close tolerance precision grab bearings, and where superior seal is required to retain lubricant and keep the bearing free from dust and dirt. Double sealed bearings are greased packed as standard. Nylon cage design. Use for medium loads and for maximum speeds in the range of 6,000 rpm. ID and OD tolerance area is +.0000/-.0005". Width tolerance is +.000/-.005".