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The 6303 bearing, as denoted by its, refers to a bearing with an inner diameter of 17mm, an outer diameter of 47mm, and a width of 14mm. These dimensions make it suitable for use in machinery where space constraints are a concern, yet high load-bearing capacity and rotational speed are required. The '6' in the designation signifies that it belongs to the single-row deep groove ball bearing series, which is known for its ability to handle radial and some axial loads.