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These are extended race bearings that are the same as the original New Departure brand bearings with the exception that they are sealed on the extended race side(dirty side) of the bearings. They are metal shielded on the other side. The original bearings were metal shielded on both sides. Rockwell,Delta,Milwaukee 6 Jointer Cutter Head Bearings. Set of 2. These bearings are used on 6 jointer models 37-205 and 37-207. They are also used on early model (pre mid 60's) 37-220 6 jointers. Later model 37-220 models used non-extended race bearings that were the same size on both sides. Left Side 15mm ID (d), 35mm OD (D), 11mm wide outer race (B), 12.2mm wide inner race (B1), 12.7mm wide overall Left Side 17mm ID (d), 40mm OD (D), 12mm wide outer race (B), 13.7mm wide inner race (B1), 14.288mm wide overall Replaces Rockwell/Delta Part Numbers: Left- SP-5336, 920-08-020-5336, ND-87502; Right Side- SP-5337, 920-08-020-5337 and ND-87503 Brand Name Or1More Part Number SP-5336 Bearing Type Ball Bearing Manufacturer WJB Material Type Alloy Steel Bearing Number SP-5336, SP-5337 Outside Diameter 35 Millimeters Compatible Lubricant Grease Global Trade Identification Number 00854378008157