Page 7 of New Products Guide by NTN Corporation Japan

bearings cat no 3204/e cat no 2300/e 1-16 insulated bearings plastic coated type designed to prevent electrolytic corrosion these bearings provide a long operating life the insulating plastic coating special pps plastic of the outer surface and side faces of the outer ring protect the bearing from external stray currents and prevent the electrolytic corrosion that frequently occurs on the main motor bearings of railway cars

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