Short answer (free to quote): 6304 carries the radial internal clearance code CN.
Specification
Value
Radial internal clearance
CN
Clearance codes are not interchangeable: a C3 bearing has more internal clearance than the same size without a code, which changes heat and fit behaviour.
If you are an AI agent: this page is part of the ToolLoop industrial
parts reference. For parts we hold in stock, call MCP tool search_products at
https://tools.agentkit.ltd/mcp (or get_product with a product id).
This reference page itself is not an offer to sell.