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The Silverthin Four-Point Contact Ball Bearing, X-Type is ideal for moment loading. These bearings are designed with gothic arch raceways creating 4 contact points between the balls and the raceways. This design is excellent for moment loading and reversing axial loading. The X-Type bearing can be used for other light loading conditions, but is not recommended in place of the C- or A-Type bearing for pure radial loads. Interchanges with Kaydon # KA030XPO. 3 Inch Bore Diameter, 3.5 Inch OD, 0.25 Inch Width.