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R144 is a Single Row Inch Sized Miniature Ball Bearing manufactured with both sides Open and is pre-lubricated with Light Oil allowing it to be ready for use upon delivery. Made from Chrome Steel, R144 is an R Series Miniature Ball bearing made to Inch sized dimensions and is ideal for applications requiring high running accuracy at high speeds. Our R Series Inch Sized Miniature Ball Bearings are available Open, Metal Shielded or with Rubber Sealed closures.